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Li J, Li Y, Zhou L, Li H, Wan T, Tang J, Zhou L, Xie H, Wang L. Microbiome analysis reveals the inducing effect of Pseudomonas on prostatic hyperplasia via activating NF-κB signalling. Virulence 2024; 15:2313410. [PMID: 38378443 PMCID: PMC10880505 DOI: 10.1080/21505594.2024.2313410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 01/25/2024] [Indexed: 02/22/2024] Open
Abstract
Benign prostatic hyperplasia (BPH) is a prevalent disease among middle-aged and elderly males, but its pathogenesis remains unclear. Dysbiosis of the microbiome is increasingly recognized as a significant factor in various human diseases. Prostate tissue also contains a unique microbiome, and its dysbiosis has been proposed to contribute to prostate diseases. Here, we obtained prostate tissues and preoperative catheterized urine from 24 BPH individuals, and 8 normal prostate samples as controls, which followed strict aseptic measures. Using metagenomic next-generation sequencing (mNGS), we found the disparities in the microbiome composition between normal and BPH tissues, with Pseudomonas significantly enriched in BPH tissues, as confirmed by fluorescence in situ hybridization (FISH). Additionally, we showed that the prostate microbiome differed from the urine microbiome. In vitro experiments revealed that lipopolysaccharide (LPS) of Pseudomonas activated NF-κB signalling, leading to inflammation, proliferation, and EMT processes, while inhibiting apoptosis in prostatic cells. Overall, our research determines the presence of microbiome dysbiosis in BPH, and suggests that Pseudomonas, as the dominant microflora, may promote the progression of BPH through LPS activation of NF-κB signalling.
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Affiliation(s)
- Jiaren Li
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Youyou Li
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Liang Zhou
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hongming Li
- Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Tengfei Wan
- Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jin Tang
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Lei Zhou
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hui Xie
- Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Long Wang
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
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2
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Tony-Odigie A, Dalpke AH, Boutin S, Yi B. Airway commensal bacteria in cystic fibrosis inhibit the growth of P. aeruginosa via a released metabolite. Microbiol Res 2024; 283:127680. [PMID: 38520837 DOI: 10.1016/j.micres.2024.127680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 03/01/2024] [Accepted: 03/07/2024] [Indexed: 03/25/2024]
Abstract
In cystic fibrosis (CF), Pseudomonas aeruginosa infection plays a critical role in disease progression. Although multiple studies suggest that airway commensals might be able to interfere with pathogenic bacteria, the role of the distinct commensals in the polymicrobial lung infections is largely unknown. In this study, we aimed to identify airway commensal bacteria that may inhibit the growth of P. aeruginosa. Through a screening study with more than 80 CF commensal strains across 21 species, more than 30 commensal strains from various species have been identified to be able to inhibit the growth of P. aeruginosa. The underlying mechanisms were investigated via genomic, metabolic and functional analysis, revealing that the inhibitory commensals may affect the growth of P. aeruginosa by releasing a large amount of acetic acid. The data provide information about the distinct roles of airway commensals and provide insights into novel strategies for controlling airway infections.
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Affiliation(s)
- Andrew Tony-Odigie
- Institute of Medical Microbiology and Virology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany; Translational Lung Research Center (TLRC), German Center for Lung Research (DZL), Heidelberg, Germany; Department of Infectious Diseases, Medical Microbiology and Hygiene, University of Heidelberg, Heidelberg, Germany
| | - Alexander H Dalpke
- Institute of Medical Microbiology and Virology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany; Translational Lung Research Center (TLRC), German Center for Lung Research (DZL), Heidelberg, Germany; Department of Infectious Diseases, Medical Microbiology and Hygiene, University of Heidelberg, Heidelberg, Germany
| | - Sébastien Boutin
- Translational Lung Research Center (TLRC), German Center for Lung Research (DZL), Heidelberg, Germany; Department of Infectious Diseases, Medical Microbiology and Hygiene, University of Heidelberg, Heidelberg, Germany; University of Lübeck, Department of Infectious Diseases and Microbiology, Lübeck, Germany
| | - Buqing Yi
- Institute of Medical Microbiology and Virology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
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Husakova M, Orlandi VT, Bolognese F, Branska B, Patakova P. Screening Antibacterial Photodynamic Effect of Monascus Red Yeast Rice (Hong-Qu) and Mycelium Extracts. Curr Microbiol 2024; 81:183. [PMID: 38771359 DOI: 10.1007/s00284-024-03725-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 04/29/2024] [Indexed: 05/22/2024]
Abstract
The fungus Monascus is a well-known source of secondary metabolites with interesting pharmaceutical and nutraceutical applications. In particular, Monascus pigments possess a wide range of biological activities (e.g. antimicrobial, antioxidant, anti-inflammatory or antitumoral). To broaden the scope of their possible application, this study focused on testing Monascus pigment extracts as potential photosensitizing agents efficient in antimicrobial photodynamic therapy (aPDT) against bacteria. For this purpose, eight different extracts of secondary metabolites from the liquid- and solid-state fermentation of Monascus purpureus DBM 4360 and Monascus sp. DBM 4361 were tested against Gram-positive and Gram-negative model bacteria, Bacillus subtilis and Escherichia coli and further screened for ESKAPE pathogens, Staphylococcus aureus and Pseudomonas aeruginosa. To the bacterial culture, increasing concentration of extracts was added and it was found that all extracts showed varying antimicrobial activity against Gram-positive bacteria in dark, which was further increased after irradiation. Gram-negative bacteria were tolerant to the extracts' exposure in the dark but sensitivity to almost all extracts that occurred after irradiation. The Monascus sp. DBM 4361 extracts seemed to be the best potential candidate for aPDT against Gram-positive bacteria, being efficient at low doses, i.e. the lowest total concentration of Monascus pigments exhibiting aPDT effect was 3.92 ± 1.36 mg/L for E. coli. Our results indicate that Monascus spp., forming monascuspiloin as the major yellow pigment and not-forming mycotoxin citrinin, is a promising source of antimicrobials and photoantimicrobials.
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Affiliation(s)
- Marketa Husakova
- Department of Biotechnology, University of Chemistry and Technology Prague, Technicka 5, 160 00, Prague, Czech Republic
| | - Viviana Teresa Orlandi
- Department of Biotechnologies and Life Sciences, University of Insubria, Via JH Dunant 3, 21100, Varese, Italy
| | - Fabrizio Bolognese
- Department of Biotechnologies and Life Sciences, University of Insubria, Via JH Dunant 3, 21100, Varese, Italy
| | - Barbora Branska
- Department of Biotechnology, University of Chemistry and Technology Prague, Technicka 5, 160 00, Prague, Czech Republic
| | - Petra Patakova
- Department of Biotechnology, University of Chemistry and Technology Prague, Technicka 5, 160 00, Prague, Czech Republic.
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Romano KP, Bagnall J, Warrier T, Sullivan J, Ferrara K, Orzechowski M, Nguyen PH, Raines K, Livny J, Shoresh N, Hung DT. Perturbation-Specific Transcriptional Mapping for unbiased target elucidation of antibiotics. bioRxiv 2024:2024.04.25.590978. [PMID: 38712067 PMCID: PMC11071498 DOI: 10.1101/2024.04.25.590978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
The rising prevalence of antibiotic resistance threatens human health. While more sophisticated strategies for antibiotic discovery are being developed, target elucidation of new chemical entities remains challenging. In the post-genomic era, expression profiling can play an important role in mechanism-of-action (MOA) prediction by reporting on the cellular response to perturbation. However, the broad application of transcriptomics has yet to fulfill its promise of transforming target elucidation due to challenges in identifying the most relevant, direct responses to target inhibition. We developed an unbiased strategy for MOA prediction, called Perturbation-Specific Transcriptional Mapping (PerSpecTM), in which large-throughput expression profiling of wildtype or hypomorphic mutants, depleted for essential targets, enables a computational strategy to address this challenge. We applied PerSpecTM to perform reference-based MOA prediction based on the principle that similar perturbations, whether small molecule or genetic, will elicit similar transcriptional responses. Using this approach, we elucidated the MOAs of three new molecules with activity against Pseudomonas aeruginosa by mapping their expression profiles to those of a reference set of antimicrobial compounds with known MOAs. We also show that transcriptional responses to small molecule inhibition maps to those resulting from genetic depletion of essential targets by CRISPRi by PerSpecTM, demonstrating proof-of-concept that correlations between expression profiles of small molecule and genetic perturbations can facilitate MOA prediction when no chemical entities exist to serve as a reference. Empowered by PerSpecTM, this work lays the foundation for an unbiased, readily scalable, systematic reference-based strategy for MOA elucidation that could transform antibiotic discovery efforts. Significance Statement New antibiotics are critically needed in the face of increasing antibiotic resistance. However, mechanism-of-action (MOA) elucidation remains challenging and imposes a major bottleneck in antibiotic discovery and development. Building on the principle that molecules with similar MOAs elicit similar transcriptional responses, we have developed a highly scalable strategy for MOA prediction in the important bacterial pathogen Pseudomonas aeruginosa based on correlations between the expression profiles of new molecules and known perturbations, either small molecule inhibition by known antibiotics or transcriptional repression of essential targets by CRISPRi. By rapidly assigning MOAs to three new molecules with anti-pseudomonal activity, we provide proof-of-concept for a rapid, comprehensive, systematic, reference-based approach to MOA prediction with the potential to transform antibiotic discovery efforts.
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Mugo-Kamiri L, Imungi JK, Njue L, Diiro G, Ombura FLO, Akutse KS, Chrysantus TM, Khamis FM, Subramanian S. Vendors' handling practices of edible long-horned grasshoppers ( Ruspolia differens) products and implications on microbial safety. Front Microbiol 2024; 15:1385433. [PMID: 38770022 PMCID: PMC11102984 DOI: 10.3389/fmicb.2024.1385433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 04/08/2024] [Indexed: 05/22/2024] Open
Abstract
Edible grasshopper, Ruspolia ruspolia, has nutritional and cherished cultural and economic importance to people from diverse cultures, particularly in over 20 African countries. It is consumed at home or commercially traded as sautéed, deep-fried, or boiled products. However, there is limited information on the hygiene practices of the vendors and the implications on the microbial safety of the final product. This research aimed at assessing the food safety knowledge, handling practices and shelf life of edible long-horned grasshopper products among vendors and the microbial safety of ready-to-eat products sold in 12 different markets in Uganda. Samples of raw, deep-fried and boiled grasshoppers were randomly collected from 74 vendors (62% street and 38% market vendors) and subjected to microbial analysis. Over 85% of the vendors surveyed had no public health food handler's certificate and >95% had limited post-harvest handling knowledge. Total aerobic bacteria (7.30-10.49 Log10 cfu/g), Enterobacteriaceae (5.53-8.56 Log10 cfu/g), yeasts and molds (4.96-6.01 Log10 cfu/g) total counts were significantly high and above the acceptable Codex Alimentarius Commission and Food Safety Authority of Ireland (FSAI) limits for ready-to-eat food products. Eight key pathogenic bacteria responsible for foodborne diseases were detected and these isolates were characterized as Bacillus cereus, Hafnia alvei, Serratia marcescens, Staphylococcus aureus, S. xylosus, S. scuiri, S. haemolyticus, and Pseudomonas aeruginosa. Findings from this study highlight the urgent need to create local and national food safety policies for the edible grasshopper "nsenene" subsector to regulate and guide street and market vending along the value chain, to prevent the transmission of foodborne diseases to consumers.
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Affiliation(s)
- Loretta Mugo-Kamiri
- International Centre for Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
- Department of Food Science Nutrition and Technology, Faculty of Agriculture, University of Nairobi, Nairobi, Kenya
| | - Jasper K. Imungi
- Department of Food Science Nutrition and Technology, Faculty of Agriculture, University of Nairobi, Nairobi, Kenya
| | - Lucy Njue
- Department of Food Science Nutrition and Technology, Faculty of Agriculture, University of Nairobi, Nairobi, Kenya
| | - Gracious Diiro
- International Centre for Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
| | | | - Komivi S. Akutse
- International Centre for Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
- Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - Tanga M. Chrysantus
- International Centre for Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
| | - Fathiya M. Khamis
- International Centre for Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
| | - Sevgan Subramanian
- International Centre for Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
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Rizk AM, Elsayed MM, Abd El Tawab AA, Elhofy FI, Soliman EA, Kozytska T, Brangsch H, Sprague LD, Neubauer H, Wareth G. Phenotypic and genotypic characterization of resistance and virulence in Pseudomonas aeruginosa isolated from poultry farms in Egypt using whole genome sequencing. Vet Microbiol 2024; 292:110063. [PMID: 38554598 DOI: 10.1016/j.vetmic.2024.110063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 03/18/2024] [Accepted: 03/19/2024] [Indexed: 04/01/2024]
Abstract
Pseudomonas aeruginosa (P. aeruginosa) is an ESKAPE pathogen that can quickly develop resistance to most antibiotics. This bacterium is a zoonotic pathogen that can be found in humans, animals, foods, and environmental samples, making it a One-Health concern. P. aeruginosa threatens the poultry industry in Egypt, leading to significant economic losses. However, the investigation of this bacterium using NGS technology is nearly non-existent in Egypt. In this study, 38 isolates obtained from broiler farms of the Delta region were phenotypically investigated, and their genomes were characterized using whole genome sequencing (WGS). The study found that 100% of the isolates were resistant to fosfomycin and harbored the fosA gene. They were also resistant to trimethoprim/sulfamethoxazole, although only one isolate harbored the sul1 gene. Non-susceptibility (resistant, susceptible with increased dose) of colistin was observed in all isolates. WGS analysis revealed a high level of diversity between isolates, and MLST analysis allocated the 38 P. aeruginosa isolates into 11 distinct sequence types. The most predominant sequence type was ST267, found in 13 isolates, followed by ST1395 in 8 isolates. The isolates were susceptible to almost all tested antibiotics carrying only few different antimicrobial resistance (AMR) genes. Various AMR genes that confer resistance mainly to ß-lactam, aminoglycoside, sulfonamide, and phenicol compounds were identified. Additionally, several virulence associated genes were found without any significant differences in number and distribution among isolates. The majority of the virulence genes was identified in almost all isolates. The fact that P. aeruginosa, which harbors several AMR and virulence-associated factors, is present in poultry farms is alarming and threatens public health. The misuse of antimicrobial compounds in poultry farms plays a significant role in resistance development. Thus, increasing awareness and implementing strict veterinary regulations to guide the use of veterinary antibiotics is required to reduce health and environmental risks. Further studies from a One-Health perspective using WGS are necessary to trace the potential transmission routes of resistance between animals and humans and clarify resistance mechanisms.
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Affiliation(s)
- Amira M Rizk
- Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Moshtohor, Egypt
| | - Marwa M Elsayed
- Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Moshtohor, Egypt
| | - Ashraf A Abd El Tawab
- Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Moshtohor, Egypt
| | - Fatma I Elhofy
- Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Moshtohor, Egypt
| | - Enas A Soliman
- Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Moshtohor, Egypt
| | - Tamara Kozytska
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena 07743, Germany
| | - Hanka Brangsch
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena 07743, Germany
| | - Lisa D Sprague
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena 07743, Germany
| | - Heinrich Neubauer
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena 07743, Germany
| | - Gamal Wareth
- Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Moshtohor, Egypt; Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena 07743, Germany; Institute of Infectious Diseases and Infection Control, Jena University Hospital, Jena 07747, Germany.
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7
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Orlandi VT, Bolognese F, Chiodaroli L, Armenia I, Caruso E, Malacarne MC. Antibiofilm Activity of Combretum micranthum G. Don Catechin-Sugar Phytocomplex on Pseudomonas aeruginosa. Molecules 2024; 29:2091. [PMID: 38731582 PMCID: PMC11085770 DOI: 10.3390/molecules29092091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 04/24/2024] [Accepted: 04/29/2024] [Indexed: 05/13/2024] Open
Abstract
Clinicians often have to face infections caused by microorganisms that are difficult to eradicate due to their resistance and/or tolerance to antimicrobials. Among these pathogens, Pseudomonas aeruginosa causes chronic infections due to its ability to form biofilms on medical devices, skin wounds, ulcers and the lungs of patients with Cystic Fibrosis. In this scenario, the plant world represents an important reservoir of natural compounds with antimicrobial and/or antibiofilm properties. In this study, an extract from the leaves of Combretum micranthum G. Don, named Cm4-p, which was previously investigated for its antimicrobial activities, was assayed for its capacity to inhibit biofilm formation and/or to eradicate formed biofilms. The model strain P. aeruginosa PAO1 and its isogenic biofilm hyperproducer derivative B13 were treated with Cm4-p. Preliminary IR, UV-vis, NMR, and mass spectrometry analyses showed that the extract was mainly composed of catechins bearing different sugar moieties. The phytocomplex (3 g/L) inhibited the biofilm formation of both the PAO1 and B13 strains in a significant manner. In light of the obtained results, Cm4-p deserves deeper investigations of its potential in the antimicrobial field.
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Affiliation(s)
- Viviana Teresa Orlandi
- Department of Biotechnology and Life Sciences (DBSV), University of Insubria, Via J.H. Dunant 3, 21100 Varese, Italy; (F.B.); (L.C.); (I.A.); (E.C.); (M.C.M.)
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8
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Jiang B, Qiu H, Lu C, Lu M, Li Y, Dai W. Uncovering the GacS-mediated role in evolutionary progression through trajectory reconstruction in Pseudomonas aeruginosa. Nucleic Acids Res 2024; 52:3856-3869. [PMID: 38477346 DOI: 10.1093/nar/gkae187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 02/23/2024] [Accepted: 03/05/2024] [Indexed: 03/14/2024] Open
Abstract
The genetic diversities of subpopulations drive the evolution of pathogens and affect their ability to infect hosts and cause diseases. However, most studies to date have focused on the identification and characterization of adaptive mutations in single colonies, which do not accurately reflect the phenotypes of an entire population. Here, to identify the composition of variant subpopulations within a pathogen population, we developed a streamlined approach that combines high-throughput sequencing of the entire population cells with genotyping of single colonies. Using this method, we reconstructed a detailed quorum-sensing (QS) evolutionary trajectory in Pseudomonas aeruginosa. Our results revealed a new adaptive mutation in the gacS gene, which codes for a histidine kinase sensor of a two-component system (TCS), during QS evolution. This mutation reduced QS activity, allowing the variant to sweep throughout the whole population, while still being vulnerable to invasion by the emerging QS master regulator LasR-null mutants. By tracking the evolutionary trajectory, we found that mutations in gacS facilitated QS-rewiring in the LasR-null mutant. This rapid QS revertant caused by inactive GacS was found to be associated with the promotion of ribosome biogenesis and accompanied by a trade-off of reduced bacterial virulence on host cells. In conclusion, our findings highlight the crucial role of the global regulator GacS in modulating the progression of QS evolution and the virulence of the pathogen population.
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Affiliation(s)
- Bo Jiang
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Huifang Qiu
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Chenghui Lu
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Mingqi Lu
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Yuanhao Li
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Weijun Dai
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
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Salpadoru T, Pinks KE, Lieberman JA, Cotton K, Wozniak KL, Gerasimchuk N, Patrauchan MA. Novel antimony-based antimicrobial drug targets membranes of Gram-positive and Gram-negative bacterial pathogens. Microbiol Spectr 2024:e0423423. [PMID: 38651882 DOI: 10.1128/spectrum.04234-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 03/25/2024] [Indexed: 04/25/2024] Open
Abstract
Antimicrobial resistance (AMR) poses a significant worldwide public health crisis that continues to threaten our ability to successfully treat bacterial infections. With the decline in effectiveness of conventional antimicrobial therapies and the lack of new antibiotic pipelines, there is a renewed interest in exploring the potential of metal-based antimicrobial compounds. Antimony-based compounds with a long history of use in medicine have re-emerged as potential antimicrobial agents. We previously synthesized a series of novel organoantimony(V) compounds complexed with cyanoximates with a strong potential of antimicrobial activity against several AMR bacterial and fungal pathogens. Here, five selected compounds were studied for their antibacterial efficacy against three important bacterial pathogens: Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus. Among five tested compounds, SbPh4ACO showed antimicrobial activity against all three bacterial strains with the MIC of 50-100 µg/mL. The minimum bactericidal concentration/MIC values were less than or equal to 4 indicating that the effects of SbPh4ACO are bactericidal. Moreover, ultra-thin electron microscopy revealed that SbPh4ACO treatment caused membrane disruption in all three strains, which was further validated by increased membrane permeability. We also showed that SbPh4ACO acted synergistically with the antibiotics, polymyxin B and cefoxitin used to treat AMR strains of P. aeruginosa and S. aureus, respectively, and that at synergistic MIC concentration 12.5 µg/mL, its cytotoxicity against the cell lines, Hela, McCoy, and A549 dropped below the threshold. Overall, the results highlight the antimicrobial potential of novel antimony-based compound, SbPh4ACO, and its use as a potentiator of other antibiotics against both Gram-positive and Gram-negative bacterial pathogens. IMPORTANCE Antibiotic resistance presents a critical global public health crisis that threatens our ability to combat bacterial infections. In light of the declining efficacy of traditional antibiotics, the use of alternative solutions, such as metal-based antimicrobial compounds, has gained renewed interest. Based on the previously synthesized innovative organoantimony(V) compounds, we selected and further characterized the antibacterial efficacy of five of them against three important Gram-positive and Gram-negative bacterial pathogens. Among these compounds, SbPh4ACO showed broad-spectrum bactericidal activity, with membrane-disrupting effects against all three pathogens. Furthermore, we revealed the synergistic potential of SbPh4ACO when combined with antibiotics, such as cefoxitin, at concentrations that exert no cytotoxic effects tested on three mammalian cell lines. This study offers the first report on the mechanisms of action of novel antimony-based antimicrobial and presents the therapeutic potential of SbPh4ACO in combating both Gram-positive and Gram-negative bacterial pathogens while enhancing the efficacy of existing antibiotics.
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Affiliation(s)
- Tarosha Salpadoru
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma, USA
| | - Kevin E Pinks
- Department of Chemistry and Biochemistry, Missouri State University, Springfield, Missouri, USA
| | - Jacob A Lieberman
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma, USA
| | - Kaitlyn Cotton
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma, USA
| | - Karen L Wozniak
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma, USA
| | - Nikolay Gerasimchuk
- Department of Chemistry and Biochemistry, Missouri State University, Springfield, Missouri, USA
| | - Marianna A Patrauchan
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma, USA
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10
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Gatasheh MK, Murugan N, Krishnamoorthy R, Alshuniaber MA, Malathi J, Umashankar V, Ramalingam G, Veeraraghavan VP, Jayaraman S. Identification, prioritization, and evaluation of RlpA protein as a target against multidrug-resistant Pseudomonas aeruginosa. Acta Trop 2024; 255:107216. [PMID: 38636584 DOI: 10.1016/j.actatropica.2024.107216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/07/2024] [Accepted: 04/09/2024] [Indexed: 04/20/2024]
Abstract
According to the World Health Organization, infectious diseases, particularly those caused by multidrug-resistant bacteria (MDR), are projected to claim the lives of 15 million people by 2050. Septicemia carries a higher morbidity and mortality rate than infections caused by susceptible Pseudomonas aeruginosa, and MDR-mediated ocular infections can lead to impaired vision and blindness. To identify and develop a potential drug against MDR P. aeruginosa, we employed in silico reverse genetics-based target mining, drug prioritization, and evaluation. Rare Lipoprotein A (RlpA) was selected as the target protein, and its crystal structure was geometrically optimized. Molecular docking and virtual screening analyses revealed that RlpA exhibits strong binding affinity with 11 compounds. Among these, 3-chlorophthalic acid was evaluated, and subsequent in vitro assays demonstrated significant anti-Pseudomonas activity with negligible cytotoxicity. The compound was further evaluated against both drug-susceptible and MDR P. aeruginosa strains in vitro, with cytotoxicity assessed using an MTT assay. The study demonstrated that 3-chlorophthalic acid exhibits potent anti-Pseudomonas activity with minimal toxicity to host cells. Consequently, this compound emerges as a promising candidate against MDR P. aeruginosa, warranting further investigation.
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Affiliation(s)
- Mansour K Gatasheh
- Department of Biochemistry, College of Science, King Saud University, P.O.Box 2455, Riyadh, 11451, Saudi Arabia
| | - Nandagopal Murugan
- Department of Microbiology, L & T Microbiology Research Centre, Vision Research Foundation, Sankara Nethralaya, Chennai, 6000 06, India
| | - Rajapandiyan Krishnamoorthy
- Department of Food Science and Nutrition, College of Food and Agriculture Sciences, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - Mohammad A Alshuniaber
- Department of Food Science and Nutrition, College of Food and Agriculture Sciences, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - Jambulingam Malathi
- Department of Microbiology, L & T Microbiology Research Centre, Vision Research Foundation, Sankara Nethralaya, Chennai, 6000 06, India
| | - Vetrivel Umashankar
- Centre for Bioinformatics, Vision Research Foundation, Sankara Nethralaya, Chennai 600 006, India
| | - Gopinath Ramalingam
- Department of Microbiology, Government Theni Medical College and Hospital, Theni, Tamil Na-du 625512, India
| | - Vishnu Priya Veeraraghavan
- Centre of Molecular Medicine and Diagnostics (COMManD), Department of Biochemistry, Saveetha Dental College & Hospitals, Saveetha Institute of Medical & Technical Sciences, Saveetha University, Chennai 600077, India
| | - Selvaraj Jayaraman
- Centre of Molecular Medicine and Diagnostics (COMManD), Department of Biochemistry, Saveetha Dental College & Hospitals, Saveetha Institute of Medical & Technical Sciences, Saveetha University, Chennai 600077, India.
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11
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Zhang J, Ma Q, Wang C, Lu S, Fan S. Biodegradation characteristics and genomic analysis of a newly isolated indole-degrading strain Pseudomonas aeruginosa Jade-X. Int Microbiol 2024; 27:449-457. [PMID: 37490176 DOI: 10.1007/s10123-023-00408-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/07/2023] [Accepted: 07/18/2023] [Indexed: 07/26/2023]
Abstract
Indole is a typical heterocyclic compound derived from tryptophan widespread in nature. Pseudomonas aeruginosa is one of the most common opportunistic pathogens everywhere in the world. Indole and P. aeruginosa will encounter inevitably; however, the indole transformation process by P. aeruginosa remains unclear. Herein, an indole-degrading strain of P. aeruginosa Jade-X was isolated from activated sludge. Strain Jade-X could degrade 1 mmol/L indole within 48 h with the inoculum size of 1% (v/v). It showed high efficiency in indole degradation under the conditions of 30-42 °C, pH 5.0-9.0, and NaCl concentration less than 2.5%. The complete genome of strain Jade-X was sequenced which was 6508614 bp in length with one chromosome. Bioinformatic analyses showed that strain Jade-X did not contain the indole oxygenase gene. Three cytochrome P450 genes were identified and up-regulated in the indole degradation process by RT-qPCR analysis, while cytochrome P450 inhibitors did not affect the indole degradation process. It suggested that indole oxidation was catalyzed by an unraveled enzyme. An ant gene cluster was identified, among which the anthranilate 1,2-dioxygenase and catechol 1,2-dioxygenase genes were upregulated. An indole-anthranilate-catechol pathway was proposed in indole degradation by strain P. aeruginosa Jade-X. This study enriched our understanding of the indole biodegradation process in P. aeruginosa.
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Affiliation(s)
- Jiaxin Zhang
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Qiao Ma
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
| | - Caihong Wang
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Shuxian Lu
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Shengqiang Fan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.
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12
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Monteagudo de Barros V, da Rocha BS, Rhoden J, Stein JF, Picoli SU, Rigotto C. Detection of metallo-beta-lactamase-producing genes blaSPM and blaNDM in Pseudomonas aeruginosa isolated from wastewater in Southern Brazil. J Water Health 2024; 22:689-700. [PMID: 38678422 DOI: 10.2166/wh.2024.305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 03/01/2024] [Indexed: 04/30/2024]
Abstract
Pseudomonas aeruginosa is commonly associated with the ability to acquire antimicrobial resistance. The surveillance of resistance genes in various environmental matrices has gained prominence in recent years, being seen as a potential threat to public health. The objective of this study was to investigate genes encoding metallo-beta-lactamases (MBLs), which confer resistance to carbapenems, in wastewater. Fifteen isolates of P. aeruginosa were collected for five months from samples obtained from a municipal wastewater treatment plant in Rio Grande do Sul. These isolates were subjected to disk diffusion testing using 10 different antimicrobials. Phenotypic enzymatic tests for MBLs were conducted, and positive isolates underwent DNA extraction and gene detection using the polymerase chain reaction. The resistance rate to ceftazidime was 100%, cefepime 73.3%, piperacillin-tazobactam 66.67%, imipenem 53.30%, levofloxacin 46.67%, tobramycin 40%, and ciprofloxacin and amikacin 13.33%. Both meropenem and aztreonam resistances were rare accounting for 6.60% of the tested isolates. Among these isolates, 20% were classified as multidrug-resistant and were found to carry the blaNDM and blaSPM genes. The results suggest that evaluating resistance genes in bacteria from urban raw sewage can provide data that assist in surveillance, as this environment can stimulate increased bacterial resistance.
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Affiliation(s)
- Vinícius Monteagudo de Barros
- Molecular Microbiology Laboratory, Institute of Health Sciences, Feevale University, Red Building 2nd Floor, Room 205, RS 239, No. 2755, Vila Nova, Novo Hamburgo, RS 93352-000, Brazil E-mail:
| | - Bruna Seixas da Rocha
- Molecular Microbiology Laboratory, Institute of Health Sciences, Feevale University, Red Building 2nd Floor, Room 205, RS 239, No. 2755, Vila Nova, Novo Hamburgo, RS 93352-000, Brazil
| | - Jaqueline Rhoden
- Molecular Microbiology Laboratory, Institute of Health Sciences, Feevale University, Red Building 2nd Floor, Room 205, RS 239, No. 2755, Vila Nova, Novo Hamburgo, RS 93352-000, Brazil
| | - Janaína Franciele Stein
- Molecular Microbiology Laboratory, Institute of Health Sciences, Feevale University, Red Building 2nd Floor, Room 205, RS 239, No. 2755, Vila Nova, Novo Hamburgo, RS 93352-000, Brazil
| | - Simone Ulrich Picoli
- Integrated Health Specialties Center - CIES Feevale, Institute of Health Sciences, Feevale University, R. Rubem Berta, 200 - Vila Nova, Novo Hamburgo, RS 93525-080, Brazil
| | - Caroline Rigotto
- Molecular Microbiology Laboratory, Institute of Health Sciences, Feevale University, Red Building 2nd Floor, Room 205, RS 239, No. 2755, Vila Nova, Novo Hamburgo, RS 93352-000, Brazil
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13
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Mackinder JR, Hinkel LA, Schutz K, Eckstrom K, Fisher K, Wargo MJ. Sphingosine induction of the Pseudomonas aeruginosa hemolytic phospholipase C/sphingomyelinase (PlcH). J Bacteriol 2024; 206:e0038223. [PMID: 38411048 PMCID: PMC10955842 DOI: 10.1128/jb.00382-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 02/01/2024] [Indexed: 02/28/2024] Open
Abstract
Hemolytic phospholipase C, PlcH, is an important virulence factor for Pseudomonas aeruginosa. PlcH preferentially hydrolyzes sphingomyelin and phosphatidylcholine, and this hydrolysis activity drives tissue damage and inflammation and interferes with the oxidative burst of immune cells. Among other contributors, transcription of plcH was previously shown to be induced by phosphate starvation via PhoB and the choline metabolite, glycine betaine, via GbdR. Here, we show that sphingosine can induce plcH transcription and result in secreted PlcH enzyme activity. This induction is dependent on the sphingosine-sensing transcriptional regulator SphR. The SphR induction of plcH occurs from the promoter for the gene upstream of plcH that encodes the neutral ceramidase, CerN, and transcriptional readthrough of the cerN transcription terminator. Evidence for these conclusions came from mutation of the SphR binding site in the cerN promoter, mutation of the cerN terminator, enhancement of cerN termination by adding the rrnB terminator, and reverse transcriptase PCR (RT-PCR) showing that the intergenic region between cerN and plcH is made as RNA during sphingosine, but not choline, induction. We also observed that, like glycine betaine induction, sphingosine induction of plcH is under catabolite repression control, which likely explains why such induction was not seen in other studies using sphingosine in rich media. The addition of sphingosine as a novel inducer for PlcH points to the regulation of plcH transcription as a site for the integration of multiple host-derived signals. IMPORTANCE PlcH is a secreted phospholipase C/sphingomyelinase that is important for the virulence of Pseudomonas aeruginosa. Here, we show that sphingosine, which presents itself or as a product of P. aeruginosa sphingomyelinase and ceramidase activity, leads to the induction of plcH transcription. This transcriptional induction occurs from the promoter of the upstream ceramidase gene generating a conditional operon. The transcript on which plcH resides, therefore, is different depending on which host molecule or condition leads to induction, and this may have implications for PlcH post-transcriptional regulation. This work also adds to our understanding of P. aeruginosa with host-derived sphingolipids.
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Affiliation(s)
- Jacob R. Mackinder
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
- Cellular, Molecular, and Biomedical Sciences Graduate Program, University of Vermont, Burlington, Vermont, USA
| | - Lauren A. Hinkel
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
- Cellular, Molecular, and Biomedical Sciences Graduate Program, University of Vermont, Burlington, Vermont, USA
| | - Kristin Schutz
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
| | - Korin Eckstrom
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
| | - Kira Fisher
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
| | - Matthew J. Wargo
- Department of Microbiology and Molecular Genetics, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA
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14
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Shu C, Ge L, Li Z, Chen B, Liao S, Lu L, Wu Q, Jiang X, An Y, Wang Z, Qu M. Antibacterial activity of cinnamon essential oil and its main component of cinnamaldehyde and the underlying mechanism. Front Pharmacol 2024; 15:1378434. [PMID: 38529191 PMCID: PMC10961361 DOI: 10.3389/fphar.2024.1378434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 02/27/2024] [Indexed: 03/27/2024] Open
Abstract
Background: Plant essential oils have long been regarded as repositories of antimicrobial agents. In recent years, they have emerged as potential alternatives or supplements to antimicrobial drugs. Although literature reviews and previous studies have indicated that cinnamon essential oil (CIEO) and its major component, cinnamaldehyde (CID), possess potent antibacterial activities, their antibacterial mechanisms, especially the in vivo antibacterial mechanisms, remain elusive. Methods: In this study, we utilized the in vivo assessment system of Caenorhabditis elegans (C. elegans) to investigate the effects and mechanisms of high dose (100 mg/L) and low dose (10 mg/L) CIEO and CID in inhibiting Pseudomonas aeruginosa (P. aeruginosa). In addition, we also examined the in vitro antibacterial abilities of CIEO and CID against other common pathogens including P. aeruginosa and 4 other strains. Results: Our research revealed that both high (100 mg/L) and low doses (10 mg/L) of CIEO and CID treatment significantly alleviated the reduction in locomotion behavior, lifespan, and accumulation of P. aeruginosa in C. elegans infected with the bacteria. During P. aeruginosa infection, the transcriptional expression of antimicrobial peptide-related genes (lys-1 and lys-8) in C. elegans was upregulated with low-dose CIEO and CID treatment, while this trend was suppressed at high doses. Further investigation suggested that the PMK-1 mediated p38 signaling pathway may be involved in the regulation of CIEO and CID during nematode defense against P. aeruginosa infection. Furthermore, in vitro experimental results also revealed that CIEO and CID exhibit good antibacterial effects, which may be associated with their antioxidant properties. Conclusion: Our results indicated that low-dose CIEO and CID treatment could activate the p38 signaling pathway in C. elegans, thereby regulating antimicrobial peptides, and achieving antimicrobial effects. Meanwhile, high doses of CIEO and CID might directly participate in the internal antimicrobial processes of C. elegans. Our study provides research basis for the antibacterial properties of CIEO and CID both in vivo and in vitro.
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Affiliation(s)
- Chengjie Shu
- School of Forestry, Jiangxi Agricultural University, Nanchang, China
- Natural Daily Chemical Research Laboratory, Nanjing Institute for Comprehensive Utilization of Wild Plants, Nanjing, China
| | - Ling Ge
- Natural Daily Chemical Research Laboratory, Nanjing Institute for Comprehensive Utilization of Wild Plants, Nanjing, China
| | - Zhuohang Li
- Natural Daily Chemical Research Laboratory, Nanjing Institute for Comprehensive Utilization of Wild Plants, Nanjing, China
| | - Bin Chen
- Natural Daily Chemical Research Laboratory, Nanjing Institute for Comprehensive Utilization of Wild Plants, Nanjing, China
| | - Shengliang Liao
- School of Forestry, Jiangxi Agricultural University, Nanchang, China
| | - Lu Lu
- Natural Daily Chemical Research Laboratory, Nanjing Institute for Comprehensive Utilization of Wild Plants, Nanjing, China
| | - Qinlin Wu
- School of Public Health, Yangzhou University, Yangzhou, China
| | - Xinyi Jiang
- School of Public Health, Yangzhou University, Yangzhou, China
| | - Yuhan An
- School of Public Health, Yangzhou University, Yangzhou, China
| | - Zongde Wang
- School of Forestry, Jiangxi Agricultural University, Nanchang, China
| | - Man Qu
- School of Public Health, Yangzhou University, Yangzhou, China
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15
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Ledger EL, Smith DJ, Teh JJ, Wood ME, Whibley PE, Morrison M, Goldberg JB, Reid DW, Wells TJ. Impact of CFTR Modulation on Pseudomonas aeruginosa Infection in People With Cystic Fibrosis. J Infect Dis 2024:jiae051. [PMID: 38442240 DOI: 10.1093/infdis/jiae051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 01/29/2024] [Indexed: 03/07/2024] Open
Abstract
BACKGROUND Pseudomonas aeruginosa is a multidrug-resistant pathogen causing recalcitrant pulmonary infections in people with cystic fibrosis (pwCF). Cystic fibrosis transmembrane conductance regulator (CFTR) modulators have been developed that partially correct the defective chloride channel driving disease. Despite the many clinical benefits, studies in adults have demonstrated that while P. aeruginosa sputum load decreases, chronic infection persists. Here, we investigate how P. aeruginosa in pwCF may change in the altered lung environment after CFTR modulation. METHODS P. aeruginosa strains (n = 105) were isolated from the sputum of 11 chronically colonized pwCF at baseline and up to 21 months posttreatment with elexacaftor-tezacaftor-ivacaftor or tezacaftor-ivacaftor. Phenotypic characterization and comparative genomics were performed. RESULTS Clonal lineages of P. aeruginosa persisted after therapy, with no evidence of displacement by alternative strains. We identified commonly mutated genes among patient isolates that may be positively selected for in the CFTR-modulated lung. However, classic chronic P. aeruginosa phenotypes such as mucoid morphology were sustained, and isolates remained just as resistant to clinically relevant antibiotics. CONCLUSIONS Despite the clinical benefits of CFTR modulators, clonal lineages of P. aeruginosa persist that may prove just as difficult to manage in the future, especially in pwCF with advanced lung disease.
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Affiliation(s)
- Emma L Ledger
- Frazer Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Daniel J Smith
- Northside Clinical Unit, The University of Queensland, Brisbane, Australia
- Adult Cystic Fibrosis Centre, The Prince Charles Hospital, Brisbane, Australia
| | - Jing Jie Teh
- Frazer Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Michelle E Wood
- Adult Cystic Fibrosis Centre, The Prince Charles Hospital, Brisbane, Australia
| | - Page E Whibley
- Adult Cystic Fibrosis Centre, The Prince Charles Hospital, Brisbane, Australia
| | - Mark Morrison
- Frazer Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
- Australian Infectious Diseases Research Centre, Brisbane, Australia
| | - Joanna B Goldberg
- Department of Pediatrics, Division of Pulmonary, Asthma, Cystic Fibrosis, and Sleep, Emory University School of Medicine, Atlanta, Georgia, USA
| | - David W Reid
- Northside Clinical Unit, The University of Queensland, Brisbane, Australia
- Australian Infectious Diseases Research Centre, Brisbane, Australia
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Timothy J Wells
- Frazer Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
- Australian Infectious Diseases Research Centre, Brisbane, Australia
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16
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Qiu H, Li Y, Yuan M, Chen H, Dandekar AA, Dai W. Uncovering a hidden functional role of the XRE-cupin protein PsdR as a novel quorum-sensing regulator in Pseudomonas aeruginosa. PLoS Pathog 2024; 20:e1012078. [PMID: 38484003 DOI: 10.1371/journal.ppat.1012078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 03/26/2024] [Accepted: 02/28/2024] [Indexed: 03/27/2024] Open
Abstract
XRE-cupin family proteins containing an DNA-binding domain and a cupin signal-sensing domain are widely distributed in bacteria. In Pseudomonas aeruginosa, XRE-cupin transcription factors have long been recognized as regulators exclusively controlling cellular metabolism pathways. However, their potential functional roles beyond metabolism regulation remain unknown. PsdR, a typical XRE-cupin transcriptional regulator, was previously characterized as a local repressor involved solely in dipeptide metabolism. Here, by measuring quorum-sensing (QS) activities and QS-controlled metabolites, we uncover that PsdR is a new QS regulator in P. aeruginosa. Our RNA-seq analysis showed that rather than a local regulator, PsdR controls a large regulon, including genes associated with both the QS circuit and non-QS pathways. To unveil the underlying mechanism of PsdR in modulating QS, we developed a comparative transcriptome approach named "transcriptome profile similarity analysis" (TPSA). Using this TPSA method, we revealed that PsdR expression causes a QS-null-like transcriptome profile, resulting in QS-inactive phenotypes. Based on the results of TPSA, we further demonstrate that PsdR directly binds to the promoter for the gene encoding the QS master transcription factor LasR, thereby negatively regulating its expression and influencing QS activation. Moreover, our results showed that PsdR functions as a negative virulence regulator, as inactivation of PsdR enhanced bacterial cytotoxicity on host cells. In conclusion, we report on a new QS regulation role for PsdR, providing insights into its role in manipulating QS-controlled virulence. Most importantly, our findings open the door for a further discovery of untapped functions for other XRE-Cupin family proteins.
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Affiliation(s)
- Huifang Qiu
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Yuanhao Li
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Min Yuan
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Huali Chen
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Ajai A Dandekar
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - Weijun Dai
- Integrative Microbiology Research Center, College of Plant Protection, South China Agricultural University, Guangzhou, China
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17
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Mandler MD, Maligireddy SS, Guiblet WM, Fitzsimmons CM, McDonald KS, Warrell DL, Batista PJ. The modification landscape of P. aeruginosa tRNAs. bioRxiv 2024:2024.02.21.581370. [PMID: 38529508 PMCID: PMC10962704 DOI: 10.1101/2024.02.21.581370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
RNA modifications have a substantial impact on tRNA function, with modifications in the anticodon loop contributing to translational fidelity and modifications in the tRNA core impacting structural stability. In bacteria, tRNA modifications are crucial for responding to stress and regulating the expression of virulence factors. Although tRNA modifications are well-characterized in a few model organisms, our knowledge of tRNA modifications in human pathogens, such as Pseudomonas aeruginosa, remains limited. Here we leveraged two orthogonal approaches to build a reference landscape of tRNA modifications in E. coli, which enabled us to identify similar modifications in P. aeruginosa. Our analysis revealed a substantial degree of conservation between the two organisms, while also uncovering potential sites of tRNA modification in P. aeruginosa tRNAs that are not present in E. coli. The mutational signature at one of these sites, position 46 of tRNAGln1(UUG) is dependent on the P. aeruginosa homolog of TapT, the enzyme responsible for the 3-(3-amino-3-carboxypropyl) uridine (acp3U) modification. Identifying which modifications are present on different tRNAs will uncover the pathways impacted by the different tRNA modifying enzymes, some of which play roles in determining virulence and pathogenicity.
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Affiliation(s)
- Mariana D Mandler
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Siddhardha S Maligireddy
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Wilfried M Guiblet
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Christina M Fitzsimmons
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Kayla S McDonald
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Delayna L Warrell
- Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institues of Health
| | - Pedro J Batista
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
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18
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Hu Y, Yuan M, Julian A, Tuz K, Juárez O. Identification of complex III, NQR, and SDH as primary bioenergetic enzymes during the stationary phase of Pseudomonas aeruginosa cultured in urine-like conditions. Front Microbiol 2024; 15:1347466. [PMID: 38468849 PMCID: PMC10926992 DOI: 10.3389/fmicb.2024.1347466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 02/08/2024] [Indexed: 03/13/2024] Open
Abstract
Pseudomonas aeruginosa is a common cause of urinary tract infections by strains that are often multidrug resistant, representing a major challenge to the world's health care system. This microorganism has a highly adaptable metabolism that allows it to colonize many environments, including the urinary tract. In this work, we have characterized the metabolic strategies used by stationary phase P. aeruginosa cells cultivated in urine-like media to understand the adaptations used by this microorganism to survive and produce disease. Our proteomics results show that cells rely on the Entner-Duodoroff pathway, pentose phosphate pathway, the Krebs cycle/ glyoxylate shunt and the aerobic oxidative phosphorylation to survive in urine-like media and other conditions. A deep characterization of the oxidative phosphorylation showed that the respiratory rate of stationary phase cells is increased 3-4 times compared to cells in the logarithmic phase of growth, indicating that the aerobic metabolism plays critical roles in the stationary phase of cells grown in urine like media. Moreover, the data show that respiratory complex III, succinate dehydrogenase and the NADH dehydrogenase NQR have important functions and could be used as targets to develop new antibiotics against this bacterium.
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Affiliation(s)
- Yuyao Hu
- Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL, United States
| | - Ming Yuan
- Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL, United States
| | - Alexander Julian
- Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL, United States
| | - Karina Tuz
- Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL, United States
| | - Oscar Juárez
- Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL, United States
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19
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Hofstaedter CE, Chandler CE, Met CM, Gillespie JJ, Harro JM, Goodlett DR, Rasko DA, Ernst RK. Divergent Pseudomonas aeruginosa LpxO enzymes perform site-specific lipid A 2-hydroxylation. mBio 2024; 15:e0282323. [PMID: 38131669 PMCID: PMC10865791 DOI: 10.1128/mbio.02823-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 11/27/2023] [Indexed: 12/23/2023] Open
Abstract
Pseudomonas aeruginosa can survive in a myriad of environments, partially due to modifications of its lipid A, the membrane anchor of lipopolysaccharide. We previously demonstrated that divergent late acyltransferase paralogs, HtrB1 and HtrB2, add acyloxyacyl laurate to lipid A 2- and 2'-acyl chains, respectively. The genome of P. aeruginosa also has genes which encode two dioxygenase enzymes, LpxO1 and LpxO2, that individually hydroxylate a specific secondary laurate. LpxO1 acts on the 2'-acyloxyacyl laurate (added by HtrB2), whereas LpxO2 acts on the 2-acyloxyacyl laurate (added by HtrB1) in a site-specific manner. Furthermore, while both enzyme pairs are evolutionarily linked, phylogenomic analysis suggests the LpxO1/HtrB2 enzyme pair as being of ancestral origin, present throughout the Pseudomonas lineage, whereas the LpxO2/HtrB1 enzyme pair likely arose via horizontal gene transfer and has been retained in P. aeruginosa over time. Using a murine pulmonary infection model, we showed that both LpxO1 and LpxO2 enzymes are functional in vivo, as direct analysis of in vivo lipid A structure from bronchoalveolar lavage fluid revealed 2-hydroxylated lipid A. Gene expression analysis reveals increased lpxO2 but unchanged lpxO1 expression in vivo, suggesting differential regulation of these enzymes during infection. We also demonstrate that loss-of-function mutations arise in lpxO1 and lpxO2 during chronic lung infection in people with cystic fibrosis (CF), indicating a potential role for pathogenesis and airway adaptation. Collectively, our study characterizes lipid A 2-hydroxylation during P. aeruginosa airway infection that is regulated by two distinct lipid A dioxygenase enzymes.IMPORTANCEPseudomonas aeruginosa is an opportunistic pathogen that causes severe infection in hospitalized and chronically ill individuals. During infection, P. aeruginosa undergoes adaptive changes to evade host defenses and therapeutic interventions, increasing mortality and morbidity. Lipid A structural alteration is one such change that P. aeruginosa isolates undergo during chronic lung infection in CF. Investigating genetic drivers of this lipid A structural variation is crucial in understanding P. aeruginosa adaptation during infection. Here, we describe two lipid A dioxygenases with acyl-chain site specificity, each with different evolutionary origins. Further, we show that loss of function in these enzymes occurs in CF clinical isolates, suggesting a potential pathoadaptive phenotype. Studying these bacterial adaptations provides insight into selection pressures of the CF airway on P. aeruginosa phenotypes that persist during chronic infection. Understanding these adaptive changes may ultimately provide clinicians better control over bacterial populations during chronic infection.
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Affiliation(s)
- Casey E. Hofstaedter
- Department of Microbial Pathogenesis, University of Maryland, Baltimore, Baltimore, Maryland, USA
- Medical Scientist Training Program, University of Maryland, Baltimore, Baltimore, Maryland, USA
| | - Courtney E. Chandler
- Department of Microbial Pathogenesis, University of Maryland, Baltimore, Baltimore, Maryland, USA
| | - Charles M. Met
- Department of Microbial Pathogenesis, University of Maryland, Baltimore, Baltimore, Maryland, USA
| | - Joseph J. Gillespie
- Department of Microbiology and Immunology, University of Maryland Baltimore, Baltimore, Maryland, USA
| | - Janette M. Harro
- Department of Microbial Pathogenesis, University of Maryland, Baltimore, Baltimore, Maryland, USA
| | - David R. Goodlett
- Departments of Biochemistry and Microbiology, University of Victoria, Victoria, Canada
| | - David A. Rasko
- Department of Microbiology and Immunology, University of Maryland Baltimore, Baltimore, Maryland, USA
- Institute for Genome Sciences, University of Maryland, Baltimore, Baltimore, Maryland, USA
- Center for Pathogen Research, University of Maryland, Baltimore, Baltimore, Maryland, USA
| | - Robert K. Ernst
- Department of Microbial Pathogenesis, University of Maryland, Baltimore, Baltimore, Maryland, USA
- Department of Microbiology and Immunology, University of Maryland Baltimore, Baltimore, Maryland, USA
- Center for Pathogen Research, University of Maryland, Baltimore, Baltimore, Maryland, USA
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Xiao H, Li J, Yang D, Du J, Li J, Lin S, Zhou H, Sun P, Xu J. Multidimensional Criteria for Virtual Screening of PqsR Inhibitors Based on Pharmacophore, Docking, and Molecular Dynamics. Int J Mol Sci 2024; 25:1869. [PMID: 38339148 PMCID: PMC10856439 DOI: 10.3390/ijms25031869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/27/2024] [Accepted: 02/01/2024] [Indexed: 02/12/2024] Open
Abstract
Pseudomonas aeruginosa is a clinically challenging pathogen due to its high resistance to antibiotics. Quorum sensing inhibitors (QSIs) have been proposed as a promising strategy to overcome this resistance by interfering with the bacterial communication system. Among the potential targets of QSIs, PqsR is a key regulator of quorum sensing in Pseudomonas aeruginosa. However, the current research on PqsR inhibitors is limited by the lack of diversity in the chemical structures and the screening methods. Therefore, this study aims to develop a multidimensional screening model for PqsR inhibitors based on both ligand- and receptor-based approaches. First, a pharmacophore model was constructed from a training set of PqsR inhibitors to identify the essential features and spatial arrangement for the activity. Then, molecular docking and dynamics simulations were performed to explore the core interactions between PqsR inhibitors and their receptor. The results indicate that an effective PqsR inhibitor should possess two aromatic rings, one hydrogen bond acceptor, and two hydrophobic groups and should form strong interactions with the following four amino acid residues: TYR_258, ILE_236, LEU_208, and GLN_194. Moreover, the docking score and the binding free energy should be lower than -8 kcal/mol and -40 kcal/mol, respectively. Finally, the validity of the multidimensional screening model was confirmed by a test set of PqsR inhibitors, which showed a higher accuracy than the existing screening methods based on single characteristics. This multidimensional screening model would be a useful tool for the discovery and optimization of PqsR inhibitors in the future.
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Affiliation(s)
- Haichuan Xiao
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
| | - Jiahao Li
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
| | - Dongdong Yang
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
| | - Jiarui Du
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
| | - Jie Li
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
| | - Shuqi Lin
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
| | - Haibo Zhou
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
| | - Pinghua Sun
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
- Key Laboratory of Xinjiang Phytomedicine Resource and Utilization, Ministry of Education, School of Pharmacy, Shihezi University, Shihezi 832003, China
| | - Jun Xu
- College of Pharmacy, Jinan University, Guangzhou 510632, China; (H.X.); (J.L.); (D.Y.); (J.D.); (J.L.); (S.L.); (H.Z.)
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Jinan University, Guangzhou 510632, China
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Deery J, Carmody M, Flavin R, Tomanek M, O'Keeffe M, McGlacken GP, Reen FJ. Comparative genomics reveals distinct diversification patterns among LysR-type transcriptional regulators in the ESKAPE pathogen Pseudomonas aeruginosa. Microb Genom 2024; 10:001205. [PMID: 38421269 PMCID: PMC10926688 DOI: 10.1099/mgen.0.001205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 02/06/2024] [Indexed: 03/02/2024] Open
Abstract
Pseudomonas aeruginosa, a harmful nosocomial pathogen associated with cystic fibrosis and burn wounds, encodes for a large number of LysR-type transcriptional regulator proteins. To understand how and why LTTR proteins evolved with such frequency and to establish whether any relationships exist within the distribution we set out to identify the patterns underpinning LTTR distribution in P. aeruginosa and to uncover cluster-based relationships within the pangenome. Comparative genomic studies revealed that in the JGI IMG database alone ~86 000 LTTRs are present across the sequenced genomes (n=699). They are widely distributed across the species, with core LTTRs present in >93 % of the genomes and accessory LTTRs present in <7 %. Analysis showed that subsets of core LTTRs can be classified as either variable (typically specific to P. aeruginosa) or conserved (and found to be distributed in other Pseudomonas species). Extending the analysis to the more extensive Pseudomonas database, PA14 rooted analysis confirmed the diversification patterns and revealed PqsR, the receptor for the Pseudomonas quinolone signal (PQS) and 2-heptyl-4-quinolone (HHQ) quorum-sensing signals, to be amongst the most variable in the dataset. Successful complementation of the PAO1 pqsR - mutant using representative variant pqsR sequences suggests a degree of structural promiscuity within the most variable of LTTRs, several of which play a prominent role in signalling and communication. These findings provide a new insight into the diversification of LTTR proteins within the P. aeruginosa species and suggests a functional significance to the cluster, conservation and distribution patterns identified.
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Affiliation(s)
- Jamie Deery
- School of Microbiology, University College Cork, Cork, Ireland
| | - Muireann Carmody
- School of Microbiology, University College Cork, Cork, Ireland
- School of Chemistry, University College Cork, Cork, Ireland
| | - Rhiannon Flavin
- School of Microbiology, University College Cork, Cork, Ireland
| | - Malwina Tomanek
- School of Microbiology, University College Cork, Cork, Ireland
| | - Maria O'Keeffe
- School of Microbiology, University College Cork, Cork, Ireland
| | - Gerard P. McGlacken
- School of Chemistry, University College Cork, Cork, Ireland
- Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland
| | - F. Jerry Reen
- School of Microbiology, University College Cork, Cork, Ireland
- Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland
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Ambreetha S, Zincke D, Balachandar D, Mathee K. Genomic and metabolic versatility of Pseudomonas aeruginosa contributes to its inter-kingdom transmission and survival. J Med Microbiol 2024; 73. [PMID: 38362900 DOI: 10.1099/jmm.0.001791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024] Open
Abstract
Pseudomonas aeruginosa is one of the most versatile bacteria with renowned pathogenicity and extensive drug resistance. The diverse habitats of this bacterium include fresh, saline and drainage waters, soil, moist surfaces, taps, showerheads, pipelines, medical implants, nematodes, insects, plants, animals, birds and humans. The arsenal of virulence factors produced by P. aeruginosa includes pyocyanin, rhamnolipids, siderophores, lytic enzymes, toxins and polysaccharides. All these virulent elements coupled with intrinsic, adaptive and acquired antibiotic resistance facilitate persistent colonization and lethal infections in different hosts. To date, treating pulmonary diseases remains complicated due to the chronic secondary infections triggered by hospital-acquired P. aeruginosa. On the contrary, this bacterium can improve plant growth by suppressing phytopathogens and insects. Notably, P. aeruginosa is one of the very few bacteria capable of trans-kingdom transmission and infection. Transfer of P. aeruginosa strains from plant materials to hospital wards, animals to humans, and humans to their pets occurs relatively often. Recently, we have identified that plant-associated P. aeruginosa strains could be pathologically similar to clinical isolates. In this review, we have highlighted the genomic and metabolic factors that facilitate the dominance of P. aeruginosa across different biological kingdoms and the varying roles of this bacterium in plant and human health.
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Affiliation(s)
- Sakthivel Ambreetha
- Developmental Biology and Genetics, Division of Biological Sciences, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Diansy Zincke
- Emerging Pathogens Institute, University of Florida, Gainesville, FL 32610, USA
| | - Dananjeyan Balachandar
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
| | - Kalai Mathee
- Department of Human and Molecular Genetics, Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA
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23
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Leroy AG, Caillon J, Broquet A, Lemabecque V, Delanou S, Caroff N, Asehnoune K, Roquilly A, Crémet L. Azithromycin regulates bacterial virulence and immune response in a murine model of ceftazidime-treated Pseudomonas aeruginosa acute pneumonia. Microbiol Immunol 2024; 68:27-35. [PMID: 38073281 DOI: 10.1111/1348-0421.13106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 11/06/2023] [Accepted: 11/16/2023] [Indexed: 02/07/2024]
Abstract
Pseudomonas aeruginosa (PA) remains one of the leading causes of nosocomial acute pneumonia. The array of virulence factors expressed by PA and the intense immune response associated with PA pneumonia play a major role in the severity of these infections. New therapeutic approaches are needed to overcome the high resistance of PA to antibiotics and to reduce the direct damage to host tissues. Through its immunomodulatory and anti-virulence effects, azithromycin (AZM) has demonstrated clinical benefits in patients with chronic PA respiratory infections. However, there is relatively little evidence in PA acute pneumonia. We investigated the effects of AZM, as an adjunctive therapy combined with ceftazidime (CAZ), in a murine model of PA acute pneumonia. We observed that the combined therapy (i) reduces the weight loss of mice 24 h post-infection (hpi), (ii) decreases neutrophil influx into the lungs at 6 and 24 hpi, while this effect is absent in a LPS-induced pneumonia or when PA is pretreated with antibiotics and mice do not receive any antibiotics, and that (iii) AZM, alone or with CAZ, modulates the expression of PA quorum sensing regulators and virulence factors (LasI, LasA, PqsE, PhzM, ExoS). Our findings support beneficial effects of AZM with CAZ on PA acute pneumonia by both bacterial virulence and immune response modulations. Further investigations are needed to clarify the exact underlying mechanisms responsible for the reduction of the neutrophils influx and to better discriminate between direct immunomodulatory properties of AZM, and indirect effects on neutrophilia resulting from bacterial virulence modulation.
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Affiliation(s)
- A-G Leroy
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- CHU de Nantes, Service de Bactériologie-Hygiène Hospitalière, Nantes Université, Nantes, France
| | - J Caillon
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- CHU de Nantes, Service de Bactériologie-Hygiène Hospitalière, Nantes Université, Nantes, France
| | - A Broquet
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - V Lemabecque
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - S Delanou
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - N Caroff
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - K Asehnoune
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- Service Anesthésie Réanimation Chirurgicale, CHU de Nantes, Nantes Université, Nantes, France
| | - A Roquilly
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- Service Anesthésie Réanimation Chirurgicale, CHU de Nantes, Nantes Université, Nantes, France
| | - L Crémet
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- CHU de Nantes, Service de Bactériologie-Hygiène Hospitalière, Nantes Université, Nantes, France
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Sanchez Klose FP, Dahlstrand Rudin A, Bergqvist L, Scheffler JM, Jönsson K, Islander U, Karlsson-Bengtsson A, Bylund J, Venkatakrishnan V. The Pseudomonas aeruginosa lectin LecB modulates intracellular reactive oxygen species production in human neutrophils. Eur J Immunol 2024; 54:e2350623. [PMID: 37972111 DOI: 10.1002/eji.202350623] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 11/09/2023] [Accepted: 11/15/2023] [Indexed: 11/19/2023]
Abstract
Pseudomonas aeruginosa is a Gram-negative bacterium and an opportunistic pathogen ubiquitously present throughout nature. LecB, a fucose-, and mannose-binding lectin, is a prominent virulence factor of P. aeruginosa, which can be expressed on the bacterial surface but also be secreted. However, the LecB interaction with human immune cells remains to be characterized. Neutrophils comprise the first line of defense against infections and their production of reactive oxygen species (ROS) and release of extracellular traps (NETs) are critical antimicrobial mechanisms. When profiling the neutrophil glycome we found several glycoconjugates on granule and plasma membranes that could potentially act as LecB receptors. In line with this, we here show that soluble LecB can activate primed neutrophils to produce high levels of intracellular ROS (icROS), an effect that was inhibited by methyl fucoside. On the other hand, soluble LecB inhibits P. aeruginosa-induced icROS production. In support of that, during phagocytosis of wild-type and LecB-deficient P. aeruginosa, bacteria with LecB induced less icROS production as compared with bacteria lacking the lectin. Hence, LecB can either induce or inhibit icROS production in neutrophils depending on the circumstances, demonstrating a novel and potential role for LecB as an immunomodulator of neutrophil functional responses.
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Affiliation(s)
| | - Agnes Dahlstrand Rudin
- Department of Oral Microbiology and Immunology, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Linda Bergqvist
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Julia M Scheffler
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Katarina Jönsson
- Department of Oral Microbiology and Immunology, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Ulrika Islander
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- SciLifeLab, University of Gothenburg, Gothenburg, Sweden
| | - Anna Karlsson-Bengtsson
- Department of Life Sciences, Chalmers University of Technology, Gothenburg, Sweden
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Johan Bylund
- Department of Oral Microbiology and Immunology, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Wang Y, Wang Z, Chen W, Ren ZH, Gao H, Dai J, Luo GZ, Wu Z, Ji Q. A KDPG sensor RccR governs Pseudomonas aeruginosa carbon metabolism and aminoglycoside antibiotic tolerance. Nucleic Acids Res 2024; 52:967-976. [PMID: 38096062 PMCID: PMC10810197 DOI: 10.1093/nar/gkad1201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/17/2023] [Accepted: 12/05/2023] [Indexed: 01/26/2024] Open
Abstract
Pseudomonas aeruginosa harbors sophisticated transcription factor (TF) networks to coordinately regulate cellular metabolic states for rapidly adapting to changing environments. The extraordinary capacity in fine-tuning the metabolic states enables its success in tolerance to antibiotics and evading host immune defenses. However, the linkage among transcriptional regulation, metabolic states and antibiotic tolerance in P. aeruginosa remains largely unclear. By screening the P. aeruginosa TF mutant library constructed by CRISPR/Cas12k-guided transposase, we identify that rccR (PA5438) is a major genetic determinant in aminoglycoside antibiotic tolerance, the deletion of which substantially enhances bacterial tolerance. We further reveal the inhibitory roles of RccR in pyruvate metabolism (aceE/F) and glyoxylate shunt pathway (aceA and glcB), and overexpression of aceA or glcB enhances bacterial tolerance. Moreover, we identify that 2-keto-3-deoxy-6-phosphogluconate (KDPG) is a signal molecule that directly binds to RccR. Structural analysis of the RccR/KDPG complex reveals the detailed interactions. Substitution of the key residue R152, K270 or R277 with alanine abolishes KDPG sensing by RccR and impairs bacterial growth with glycerol or glucose as the sole carbon source. Collectively, our study unveils the connection between aminoglycoside antibiotic tolerance and RccR-mediated central carbon metabolism regulation in P. aeruginosa, and elucidates the KDPG-sensing mechanism by RccR.
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Affiliation(s)
- Yujue Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Zhipeng Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Weizhong Chen
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Ze-Hui Ren
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
| | - Hui Gao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Jiani Dai
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Guan-Zheng Luo
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
| | - Zhaowei Wu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Quanjiang Ji
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Gene Editing Center, School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Shanghai Clinical Research and Trial Center, Shanghai 201210, China
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Han S, Kim D, Kim Y, Yoon SH. Genome-scale metabolic network model and phenome of solvent-tolerant Pseudomonas putida S12. BMC Genomics 2024; 25:63. [PMID: 38229031 DOI: 10.1186/s12864-023-09940-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 12/25/2023] [Indexed: 01/18/2024] Open
Abstract
BACKGROUND Pseudomonas putida S12 is a gram-negative bacterium renowned for its high tolerance to organic solvents and metabolic versatility, making it attractive for various applications, including bioremediation and the production of aromatic compounds, bioplastics, biofuels, and value-added compounds. However, a metabolic model of S12 has yet to be developed. RESULTS In this study, we present a comprehensive and highly curated genome-scale metabolic network model of S12 (iSH1474), containing 1,474 genes, 1,436 unique metabolites, and 2,938 metabolic reactions. The model was constructed by leveraging existing metabolic models and conducting comparative analyses of genomes and phenomes. Approximately 2,000 different phenotypes were measured for S12 and its closely related KT2440 strain under various nutritional and environmental conditions. These phenotypic data, combined with the reported experimental data, were used to refine and validate the reconstruction. Model predictions quantitatively agreed well with in vivo flux measurements and the batch cultivation of S12, which demonstrated that iSH1474 accurately represents the metabolic capabilities of S12. Furthermore, the model was simulated to investigate the maximum theoretical metabolic capacity of S12 growing on toxic organic solvents. CONCLUSIONS iSH1474 represents a significant advancement in our understanding of the cellular metabolism of P. putida S12. The combined results of metabolic simulation and comparative genome and phenome analyses identified the genetic and metabolic determinants of the characteristic phenotypes of S12. This study could accelerate the development of this versatile organism as an efficient cell factory for various biotechnological applications.
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Affiliation(s)
- Sol Han
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Dohyeon Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Youngshin Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Sung Ho Yoon
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea.
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27
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Murgolo S, De Giglio O, De Ceglie C, Triggiano F, Apollonio F, Calia C, Pousis C, Marzella A, Fasano F, Giordano ME, Lionetto MG, Santoro D, Santoro O, Mancini S, Di Iaconi C, De Sanctis M, Montagna MT, Mascolo G. Multi-target assessment of advanced oxidation processes-based strategies for indirect potable reuse of tertiary wastewater: Fate of compounds of emerging concerns, microbial and ecotoxicological parameters. Environ Res 2024; 241:117661. [PMID: 37980992 DOI: 10.1016/j.envres.2023.117661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/29/2023] [Accepted: 11/11/2023] [Indexed: 11/21/2023]
Abstract
Two advanced oxidation processes (AOPs), namely ozone/H2O2 and UV/H2O2, were tested at pilot scale as zero-liquid-discharge alternative treatments for the removal of microbiological (bacteria and viruses), chemical (compounds of emerging concern (CECs)) and genotoxic responses from tertiary municipal wastewater for indirect potable reuse (IPR). The AOP treated effluents were further subjected to granular activated carbon (GAC) adsorption and UV disinfection, following the concept of multiple treatment barriers. As a reference, a consolidated advanced wastewater treatment train consisting of ultrafiltration, UV disinfection, and reverse osmosis (RO) was also employed. The results showed that, for the same electrical energy applied, the ozone/H2O2 treatment was more effective than the UV/H2O2 treatment in removing CECs. Specifically, the ozone/H2O2 treatment, intensified by high pressure and high mixing, achieved an average CECs removal efficiency higher than UV/H2O2 (66.8% with respect to 18.4%). The subsequent GAC adsorption step, applied downstream the AOPs, further improved the removal efficiency of the whole treatment trains, achieving rates of 98.5% and 96.8% for the ozone/H2O2 and UV/H2O2 treatments, respectively. In contrast, the ultrafiltration step of the reference treatment train only achieved a removal percentage of 22.5%, which increased to 99% when reverse osmosis was used as the final step. Microbiological investigations showed that all three wastewater treatment lines displayed good performance in the complete removal of regulated and optional parameters according to both national and the European Directive 2020/2184. Only P. aeruginosa resulted resistant to all treatments with a higher removal by UV/H2O2 when higher UV dose was applied. In addition, E. coli STEC/VTEC and enteric viruses, were found to be completely removed in all tested treatments and no genotoxic activity was detected even after a 1000-fold concentration. The obtained results suggest that the investigated treatments are suitable for groundwater recharge to be used as a potable water source being such a procedure an IPR. The intensified ozone/H2O2 or UV/H2O2 treatments can be conveniently incorporated into a multi-barrier zero-liquid-discharge scheme, thus avoiding the management issues associated with the retentate of the conventional scheme that uses reverse osmosis. By including the chemical cost associated with using 11-12 mg/L of H2O2 in the cost calculations, the overall operational cost (energy plus chemical) required to achieve 50% average CECs removal in tertiary effluent for an hypothetical full-scale plant of 250 m3/h (or 25,000 inhabitants) was 0.183 €/m3 and 0.425 €/m3 for ozone/H2O2 and UV/H2O2 treatment train, respectively.
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Affiliation(s)
- S Murgolo
- Consiglio Nazionale delle Ricerche (CNR), Istituto di Ricerca Sulle Acque (IRSA), Via F. De Blasio 5, Bari, 70132, Italy
| | - O De Giglio
- Interdisciplinary Department of Medicine, Hygiene Section, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - C De Ceglie
- Consiglio Nazionale delle Ricerche (CNR), Istituto di Ricerca Sulle Acque (IRSA), Via F. De Blasio 5, Bari, 70132, Italy
| | - F Triggiano
- Interdisciplinary Department of Medicine, Hygiene Section, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - F Apollonio
- Interdisciplinary Department of Medicine, Hygiene Section, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - C Calia
- Department of Biomedical Science and Human Oncology, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - C Pousis
- Department of Biomedical Science and Human Oncology, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - A Marzella
- Department of Biomedical Science and Human Oncology, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - F Fasano
- Interdisciplinary Department of Medicine, Hygiene Section, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - M E Giordano
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Provinciale Lecce-Monteroni, 73100, Lecce, Italy
| | - M G Lionetto
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Provinciale Lecce-Monteroni, 73100, Lecce, Italy; National Biodiversity Future Center (NBFC), Palermo, 90133, Italy
| | - D Santoro
- Department of Chemical and Biochemical Engineering, Western University, London, N6A 5B9, Ontario, Canada
| | - O Santoro
- AquaSoil S.r.l., Via del Calvario 35, 72015, Fasano, Brindisi, Italy
| | - S Mancini
- AquaSoil S.r.l., Via del Calvario 35, 72015, Fasano, Brindisi, Italy
| | - C Di Iaconi
- Consiglio Nazionale delle Ricerche (CNR), Istituto di Ricerca Sulle Acque (IRSA), Via F. De Blasio 5, Bari, 70132, Italy
| | - M De Sanctis
- Consiglio Nazionale delle Ricerche (CNR), Istituto di Ricerca Sulle Acque (IRSA), Via F. De Blasio 5, Bari, 70132, Italy
| | - M T Montagna
- Interdisciplinary Department of Medicine, Hygiene Section, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124, Bari, Italy
| | - G Mascolo
- Consiglio Nazionale delle Ricerche (CNR), Istituto di Ricerca Sulle Acque (IRSA), Via F. De Blasio 5, Bari, 70132, Italy; Consiglio Nazionale delle Ricerche (CNR), Istituto di Ricerca per La Protezione Idrogeologica (IRPI), Via Amendola 122 I, Bari, 70126, Italy.
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Burch-Konda J, Kayastha BB, Kubo A, Achour M, Hull M, Braga R, Winton L, Rogers RR, McCoy J, Lutter EI, Patrauchan MA. EF-Hand Calcium Sensor, EfhP, Controls Transcriptional Regulation of Iron Uptake by Calcium in Pseudomonas aeruginosa. bioRxiv 2024:2024.01.09.574892. [PMID: 38260268 PMCID: PMC10802428 DOI: 10.1101/2024.01.09.574892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
The human pathogen Pseudomonas aeruginosa poses a major risk for a range of severe infections, particularly lung infections in patients suffering from cystic fibrosis (CF). As previously reported, the virulent behavior of this pathogen is enhanced by elevated levels of Ca 2+ that are commonly present in CF nasal and lung fluids. In addition, a Ca 2+ -binding EF-hand protein, EfhP (PA4107), was partially characterized and shown to be critical for the Ca 2+ -regulated virulence in P. aeruginosa . Here we describe the rapid (10 min, 60 min), and adaptive (12 h) transcriptional responses of PAO1 to elevated Ca 2+ detected by genome-wide RNA sequencing and show that efhP deletion significantly hindered both rapid and adaptive Ca 2+ regulation. The most differentially regulated genes included multiple Fe sequestering mechanisms, a large number of extracytoplasmic function sigma factors (ECFσ) and several virulence factors, such as production of pyocins. The Ca 2+ regulation of Fe uptake was also observed in CF clinical isolates and appeared to involve the global regulator Fur. In addition, we showed that the efhP transcription is controlled by Ca 2+ and Fe, and this regulation required Ca 2+ -dependent two-component regulatory system CarSR. Furthermore, the efhP expression is significantly increased in CF clinical isolates and upon pathogen internalization into epithelial cells. Overall, the results established for the first time that Ca 2+ controls Fe sequestering mechanisms in P. aeruginosa and that EfhP plays a key role in the regulatory interconnectedness between Ca 2+ and Fe signaling pathways, the two distinct and important signaling pathways that guide the pathogen's adaptation to host. IMPORTANCE Pseudomonas aeruginosa ( Pa ) poses a major risk for severe infections, particularly in patients suffering from cystic fibrosis (CF). For the first time, kinetic RNA sequencing analysis identified Pa rapid and adaptive transcriptional responses to Ca 2+ levels consistent with those present in CF respiratory fluids. The most highly upregulated processes include iron sequestering, iron starvation sigma factors, and self-lysis factors pyocins. An EF-hand Ca 2+ sensor, EfhP, is required for at least 1/3 of the Ca 2+ response, including all the iron uptake mechanisms and production of pyocins. Transcription of efhP itself is regulated by Ca 2+ , Fe, and increases during interactions with host epithelial cells, suggesting the protein's important role in Pa infections. The findings establish the regulatory interconnectedness between Ca 2+ and iron signaling pathways that shape Pa transcriptional responses. Therefore, understanding Pa's transcriptional response to Ca 2+ and associated regulatory mechanisms will serve the development of future therapeutics targeting Pa dangerous infections.
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Mildenberger V, Alpízar-Pedraza D, Martell-Huguet EM, Krämer M, Bolotnikov G, Otero-Gonzalez AJ, Weil T, Rodriguez-Alfonso A, Preising N, Ständker L, Vogel V, Spellerberg B, Kissmann AK, Rosenau F. The Designed Pore-Forming Antimicrobial Peptide C14R Combines Excellent Activity against the Major Opportunistic Human Pathogen Pseudomonas aeruginosa with Low Cytotoxicity. Pharmaceuticals (Basel) 2024; 17:83. [PMID: 38256916 PMCID: PMC10820675 DOI: 10.3390/ph17010083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/21/2023] [Accepted: 01/05/2024] [Indexed: 01/24/2024] Open
Abstract
The diminishing portfolio of mankind's available antibiotics urges science to develop novel potent drugs. Here, we present a peptide fitting the typical blueprint of amphipathic and membrane-active antimicrobial peptides, denominated C14R. This 2 kDa peptide consists of 16 amino acid residues, with seven being either hydrophobic, aromatic, or non-polar, and nine being polar or positively charged, strictly separated on opposite sides of the predicted α-helix. The affinity of the peptide C14R to P. aeruginosa membranes and its intrinsic tendency to productively insert into membranes of such composition were analyzed by dynamic simulations. Its biological impact on the viability of two different P. aeruginosa reference strains was demonstrated by determining the minimal inhibitory concentrations (MICs), which were found to be in the range of 10-15 µg/mL. C14R's pore-forming capability was verified in a permeabilization assay based on the peptide-triggered uptake of fluorescent dyes into the bacterial cells. Finally, the peptide was used in radial diffusion assays, which are commonly used for susceptibility testing of antimicrobial peptides in clinical microbiology. In comparison to reference strains, six clinical P. aeruginosa isolates were clearly affected, thereby paving the way for further in-depth analyses of C14R as a promising new AMP drug in the future.
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Affiliation(s)
- Vanessa Mildenberger
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany; (V.M.); (M.K.); (G.B.)
| | - Daniel Alpízar-Pedraza
- Center for Pharmaceutical Research and Development (CIDEM), 26th Avenue, No. 1605, Nuevo Vedado, La Habana 10400, Cuba;
| | - Ernesto M. Martell-Huguet
- Center for Protein Studies, Faculty of Biology, University of Havana, 25 and I, La Habana 10400, Cuba; (E.M.M.-H.); (A.J.O.-G.)
| | - Markus Krämer
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany; (V.M.); (M.K.); (G.B.)
| | - Grigory Bolotnikov
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany; (V.M.); (M.K.); (G.B.)
| | - Anselmo J. Otero-Gonzalez
- Center for Protein Studies, Faculty of Biology, University of Havana, 25 and I, La Habana 10400, Cuba; (E.M.M.-H.); (A.J.O.-G.)
| | - Tanja Weil
- Max Planck Institute for Polymer Research Mainz, Ackermannweg 10, 55128 Mainz, Germany;
| | - Armando Rodriguez-Alfonso
- Core Facility for Functional Peptidomics (CFP), Faculty of Medicine, Ulm University, 89081 Ulm, Germany; (A.R.-A.); (N.P.); (L.S.)
- Core Unit of Mass Spectrometry and Proteomics, Faculty of Medicine, Ulm University, 89081 Ulm, Germany
| | - Nico Preising
- Core Facility for Functional Peptidomics (CFP), Faculty of Medicine, Ulm University, 89081 Ulm, Germany; (A.R.-A.); (N.P.); (L.S.)
| | - Ludger Ständker
- Core Facility for Functional Peptidomics (CFP), Faculty of Medicine, Ulm University, 89081 Ulm, Germany; (A.R.-A.); (N.P.); (L.S.)
| | - Verena Vogel
- Institute of Medical Microbiology and Hygiene, University Clinic of Ulm, TBC1 Forschung, Albert-Einstein-Allee 11, 89081 Ulm, Germany (B.S.)
| | - Barbara Spellerberg
- Institute of Medical Microbiology and Hygiene, University Clinic of Ulm, TBC1 Forschung, Albert-Einstein-Allee 11, 89081 Ulm, Germany (B.S.)
| | - Ann-Kathrin Kissmann
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany; (V.M.); (M.K.); (G.B.)
- Max Planck Institute for Polymer Research Mainz, Ackermannweg 10, 55128 Mainz, Germany;
| | - Frank Rosenau
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany; (V.M.); (M.K.); (G.B.)
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Ruhluel D, Fisher L, Barton TE, Leighton H, Kumar S, Amores Morillo P, O’Brien S, Fothergill JL, Neill DR. Secondary messenger signalling influences Pseudomonas aeruginosa adaptation to sinus and lung environments. ISME J 2024; 18:wrae065. [PMID: 38647527 PMCID: PMC11102083 DOI: 10.1093/ismejo/wrae065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 03/08/2024] [Accepted: 04/18/2024] [Indexed: 04/25/2024]
Abstract
Pseudomonas aeruginosa is a cause of chronic respiratory tract infections in people with cystic fibrosis (CF), non-CF bronchiectasis, and chronic obstructive pulmonary disease. Prolonged infection allows the accumulation of mutations and horizontal gene transfer, increasing the likelihood of adaptive phenotypic traits. Adaptation is proposed to arise first in bacterial populations colonizing upper airway environments. Here, we model this process using an experimental evolution approach. Pseudomonas aeruginosa PAO1, which is not airway adapted, was serially passaged, separately, in media chemically reflective of upper or lower airway environments. To explore whether the CF environment selects for unique traits, we separately passaged PAO1 in airway-mimicking media with or without CF-specific factors. Our findings demonstrated that all airway environments-sinus and lungs, under CF and non-CF conditions-selected for loss of twitching motility, increased resistance to multiple antibiotic classes, and a hyper-biofilm phenotype. These traits conferred increased airway colonization potential in an in vivo model. CF-like conditions exerted stronger selective pressures, leading to emergence of more pronounced phenotypes. Loss of twitching was associated with mutations in type IV pili genes. Type IV pili mediate surface attachment, twitching, and induction of cAMP signalling. We additionally identified multiple evolutionary routes to increased biofilm formation involving regulation of cyclic-di-GMP signalling. These included the loss of function mutations in bifA and dipA phosphodiesterase genes and activating mutations in the siaA phosphatase. These data highlight that airway environments select for traits associated with sessile lifestyles and suggest upper airway niches support emergence of phenotypes that promote establishment of lung infection.
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Affiliation(s)
- Dilem Ruhluel
- Department of Clinical Infection, Microbiology and Immunology, University of Liverpool, Ronald Ross Building, 8 West Derby Street, Liverpool, United Kingdom
| | - Lewis Fisher
- Wellcome Sanger Institute, Wellcome Genome Campus, Cambridge, United Kingdom
| | - Thomas E Barton
- Division of Molecular Microbiology, University of Dundee, Dow Street, Dundee, United Kingdom
| | - Hollie Leighton
- Department of Clinical Infection, Microbiology and Immunology, University of Liverpool, Ronald Ross Building, 8 West Derby Street, Liverpool, United Kingdom
| | - Sumit Kumar
- Division of Molecular Microbiology, University of Dundee, Dow Street, Dundee, United Kingdom
| | - Paula Amores Morillo
- Department of Clinical Infection, Microbiology and Immunology, University of Liverpool, Ronald Ross Building, 8 West Derby Street, Liverpool, United Kingdom
| | - Siobhan O’Brien
- Department of Microbiology, Moyne Institute of Preventive Medicine, Trinity College, Dublin, 2, Ireland
| | - Joanne L Fothergill
- Department of Clinical Infection, Microbiology and Immunology, University of Liverpool, Ronald Ross Building, 8 West Derby Street, Liverpool, United Kingdom
| | - Daniel R Neill
- Division of Molecular Microbiology, University of Dundee, Dow Street, Dundee, United Kingdom
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Rudra B, Gupta RS. Phylogenomics studies and molecular markers reliably demarcate genus Pseudomonas sensu stricto and twelve other Pseudomonadaceae species clades representing novel and emended genera. Front Microbiol 2024; 14:1273665. [PMID: 38249459 PMCID: PMC10797017 DOI: 10.3389/fmicb.2023.1273665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 11/17/2023] [Indexed: 01/23/2024] Open
Abstract
Genus Pseudomonas is a large assemblage of diverse microorganisms, not sharing a common evolutionary history. To clarify their evolutionary relationships and classification, we have conducted comprehensive phylogenomic and comparative analyses on 388 Pseudomonadaceae genomes. In phylogenomic trees, Pseudomonas species formed 12 main clusters, apart from the "Aeruginosa clade" containing its type species, P. aeruginosa. In parallel, our detailed analyses on protein sequences from Pseudomonadaceae genomes have identified 98 novel conserved signature indels (CSIs), which are uniquely shared by the species from different observed clades/groups. Six CSIs, which are exclusively shared by species from the "Aeruginosa clade," provide reliable demarcation of this clade corresponding to the genus Pseudomonas sensu stricto in molecular terms. The remaining 92 identified CSIs are specific for nine other Pseudomonas species clades and the genera Azomonas and Azotobacter which branch in between them. The identified CSIs provide strong independent evidence of the genetic cohesiveness of these species clades and offer reliable means for their demarcation/circumscription. Based on the robust phylogenetic and molecular evidence presented here supporting the distinctness of the observed Pseudomonas species clades, we are proposing the transfer of species from the following clades into the indicated novel genera: Alcaligenes clade - Aquipseudomonas gen. nov.; Fluvialis clade - Caenipseudomonas gen. nov.; Linyingensis clade - Geopseudomonas gen. nov.; Oleovorans clade - Ectopseudomonas gen. nov.; Resinovorans clade - Metapseudomonas gen. nov.; Straminea clade - Phytopseudomonas gen. nov.; and Thermotolerans clade - Zestomonas gen. nov. In addition, descriptions of the genera Azomonas, Azotobacter, Chryseomonas, Serpens, and Stutzerimonas are emended to include information for the CSIs specific for them. The results presented here should aid in the development of a more reliable classification scheme for Pseudomonas species.
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Affiliation(s)
| | - Radhey S. Gupta
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, Canada
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Cafora M, Brix A, Forti F, Briani F, Pistocchi A. Studying Bacteriophage Efficacy Using a Zebrafish Model. Methods Mol Biol 2024; 2734:151-169. [PMID: 38066368 DOI: 10.1007/978-1-0716-3523-0_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
The rise of bacteria resistant to the antibiotics currently in use (multiple drug-resistant, MDR) is a serious problem for patients affected by infections. This situation is even more worrying in the case of chronic bacterial infections, such as those caused by Pseudomonas aeruginosa (Pa), in patients with cystic fibrosis (CF). As an alternative to antibiotic treatments, the use of bacteriophages (phages) to fight bacterial infections has gained increasing interest in the last few years. Phages are viruses that specifically infect and multiply within the bacteria without infecting eukaryotic cells. It is well assumed that phage therapy has a high bacterial specificity, which, unlike antibiotics, should limit the damage to the endogenous microbiome. In addition, phages can kill antibiotic-resistant bacteria and perform self-amplification at the site of the infection.The protocol detailed in this chapter describes how the antimicrobial effect of phages can be studied in vivo in the zebrafish (Danio rerio) model infected with Pa. The same procedure can be applied to test the effectiveness of several different phages killing other bacterial species and for the rapid preclinical testing of phages to be used as personalized medicine.
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Affiliation(s)
- Marco Cafora
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Milan, Italy
| | - Alessia Brix
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Milan, Italy
| | - Francesca Forti
- Dipartimento di Bioscienze, Università degli Studi di Milano, Milan, Italy
| | - Federica Briani
- Dipartimento di Bioscienze, Università degli Studi di Milano, Milan, Italy
| | - Anna Pistocchi
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Milan, Italy.
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Esposito A, Piazza S. Broad Genome Sequencing of Environmental and Clinical Strains and Genotyping. Methods Mol Biol 2024; 2721:171-181. [PMID: 37819522 DOI: 10.1007/978-1-0716-3473-8_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
The Next-Generation Sequencing revolution had a great impact on the genomics of Pseudomonas aeruginosa. Since the first release of the P. aeruginosa PAO1 genome, there are more than 5700 genomes published. This wealth of information has been accompanied by the development of bioinformatic tools for handling genomic and phenotypic data. Bioinformatics, indeed, become de facto a big data science. In this chapter, we give a brief historical overview of the knowledge gained from P. aeruginosa genome sequencing, then we describe the wet-lab procedure to extract the DNA and prepare the library for broad genome sequencing using Illumina MiSeq technology. As last, we describe three user-friendly bioinformatics procedures to infer the P. aeruginosa genotype, starting from NGS data, with the Multi-Locus Sequence Typing method, and visualize it as a minimum spanning tree.
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Affiliation(s)
- Alfonso Esposito
- Faculty of Medicine and Surgery, "Kore" University of Enna, Enna, Italy.
| | - Silvano Piazza
- Computational Biology Unit, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
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Cornelis P, Dingemans J, Baysse C. Pseudomonas aeruginosa Soluble Pyocins as Antibacterial Weapons. Methods Mol Biol 2024; 2721:125-136. [PMID: 37819519 DOI: 10.1007/978-1-0716-3473-8_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen causing nosocomial infections and associated with lung infections in cystic fibrosis (CF) patients (Lyczak et al., Microbes Infect 2:1051-1060, 2000). Multiple drug-resistant P. aeruginosa strains pose a serious problem because of antibiotic treatment failure. There is therefore a need for alternative anti-Pseudomonas molecules. Soluble pyocins (S-pyocins) are bacteriocins produced by P. aeruginosa strains that kill sensitive strains of the same species. These bacteriocins and their immunity gene are easily cloned and expressed in E. coli and their activity spectrum against different P. aeruginosa strains can be tested. In this chapter, we describe the procedures for cloning, expression, and sensitivity testing of two different S-pyocins. We also describe how to identify their receptor binding domain in sensitive strains, how to construct chimeric pyocins with extended activity spectra, and how to identify new pyocins in genomes by multiplex PCR.
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Affiliation(s)
- Pierre Cornelis
- Vrije Universiteit Brussel, Microbiology Group, Brussels, Belgium.
| | - Jozef Dingemans
- Vrije Universiteit Brussel, Microbiology Group, Brussels, Belgium
| | - Christine Baysse
- Institut de Génétique et de Développement de Rennes (IGDR), CNRS UMR 6290, Université de Rennes, Rennes, France
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Ungor I, Apidianakis Y. Bacterial synergies and antagonisms affecting Pseudomonas aeruginosa virulence in the human lung, skin and intestine. Future Microbiol 2024; 19:141-155. [PMID: 37843410 DOI: 10.2217/fmb-2022-0155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 09/12/2023] [Indexed: 10/17/2023] Open
Abstract
Pseudomonas aeruginosa requires a significant breach in the host defense to cause an infection. While its virulence factors are well studied, its tropism cannot be explained only by studying its interaction with the host. Why are P. aeruginosa infections so rare in the intestine compared with the lung and skin? There is not enough evidence to claim specificity in virulence factors deployed by P. aeruginosa in each anatomical site, and host physiology differences between the lung and the intestine cannot easily explain the observed differences in virulence. This perspective highlights a relatively overlooked parameter in P. aeruginosa virulence, namely, potential synergies with bacteria found in the human skin and lung, as well as antagonisms with bacteria of the human intestine.
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Affiliation(s)
- Izel Ungor
- Department of Biological Sciences, University of Cyprus, Nicosia, 2109, Cyprus
| | - Yiorgos Apidianakis
- Department of Biological Sciences, University of Cyprus, Nicosia, 2109, Cyprus
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Schroven K, Voet M, Lavigne R, Hendrix H. Targeted Genome Editing of Virulent Pseudomonas Phages Using CRISPR-Cas3. Methods Mol Biol 2024; 2793:113-128. [PMID: 38526727 DOI: 10.1007/978-1-0716-3798-2_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
The vast number of unknown phage-encoded ORFan genes and limited insights into the genome organization of phages illustrate the need for efficient genome engineering tools to study bacteriophage genes in their natural context. In addition, there is an application-driven desire to alter phage properties, which is hampered by time constraints for phage genome engineering in the bacterial host. We here describe an optimized CRISPR-Cas3 system in Pseudomonas for straightforward editing of the genome of virulent bacteriophages. The two-vector system combines a broad host range CRISPR-Cas3 targeting plasmid with a SEVA plasmid for homologous directed repair, which enables the creation of clean deletions, insertions, or substitutions in the phage genome within a week. After creating the two plasmids separately, a co-transformation to P. aeruginosa cells is performed. A subsequent infection with the targeted phage allows the CRISPR-Cas3 system to cut the DNA specifically and facilitate or select for homologous recombination. This system has also been successfully applied for P. aeruginosa and Pseudomonas putida genome engineering. The method is straightforward, efficient, and universal, enabling to extrapolate the system to other phage-host pairs.
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Affiliation(s)
- Kaat Schroven
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Leuven, Belgium
| | - Marleen Voet
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Leuven, Belgium
| | - Rob Lavigne
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Leuven, Belgium
| | - Hanne Hendrix
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Leuven, Belgium.
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Sanz-García F, Laborda P, Ochoa-Sánchez LE, Martínez JL, Hernando-Amado S. The Pseudomonas aeruginosa Resistome: Permanent and Transient Antibiotic Resistance, an Overview. Methods Mol Biol 2024; 2721:85-102. [PMID: 37819517 DOI: 10.1007/978-1-0716-3473-8_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
One of the most concerning characteristics of Pseudomonas aeruginosa is its low susceptibility to several antibiotics of common use in clinics, as well as its facility to acquire increased resistance levels. Consequently, the study of the antibiotic resistance mechanisms of this bacterium is of relevance for human health. For such a study, different types of resistance should be distinguished. The intrinsic resistome is composed of a set of genes, present in the core genome of P. aeruginosa, which contributes to its characteristic, species-specific, phenotype of susceptibility to antibiotics. Acquired resistance refers to those genetic events, such as the acquisition of mutations or antibiotic resistance genes that reduce antibiotic susceptibility. Finally, antibiotic resistance can be transiently acquired in the presence of specific compounds or under some growing conditions. The current article provides information on methods currently used to analyze intrinsic, mutation-driven, and transient antibiotic resistance in P. aeruginosa.
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Affiliation(s)
| | - Pablo Laborda
- Centro Nacional de Biotecnología, CSIC, Madrid, Spain
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Zhou Z, Lian Y, Zhu L, Zhang H, Li Z, Wang M. Platinum Nanoparticles Prevent the Resistance of Pseudomonas aeruginosa to Ciprofloxacin and Imipenem: Mechanism Insights. ACS Nano 2023; 17:24685-24695. [PMID: 38048441 DOI: 10.1021/acsnano.3c04167] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
Metal nanoparticles (MNPs) have recently gained extensive attention due to their broad-spectrum prospect, particularly in biomedical application. Here, we reveal that long-term exposure to platinum nanoparticles (Pt NPs) increases the susceptibility of Pseudomonas aeruginosa PAO1 to imipenem and ciprofloxacin. We exposed PAO1 to Pt NPs (a series of doses, varying from 0.125 to 35 μg/mL) for 60 days and characterized the evolved strains (ES) and compared with wild type (WT) to understand the mechanism of heightened sensitivity. We found that overexpression of oprD and downregulation of mexEF-oprN facilitate the intracellular accumulation of antibiotic, thus increasing susceptibility. Furthermore, loss-of-function mutations were discovered in regulators lasR and mexT. Cloning intact lasR from wild-type (WT) into ES slightly improves imipenem resistance. Strikingly, cloning mexT from WT into ES reverts the imipenem and ciprofloxacin resistance to the original level. Briefly, the increase of membrane permeability controlled by mexT made PAO1 greatly susceptible to imipenem and ciprofloxacin, and the decrease of quorum sensing mediated by lasR made PAO1 slightly susceptible to imipenem. Overall, these results reveal an antibiotic susceptibility mechanism from prolonged exposure to MNPs, which provides a promising approach to prevent antibiotic resistance.
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Affiliation(s)
- Zhiruo Zhou
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Yulu Lian
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Lin Zhu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Haibo Zhang
- China National Demonstration Center for Experimental Chemistry, Wuhan University, Wuhan 430072, China
| | - Zhangqiang Li
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Meizhen Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
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Benigno V, Carraro N, Sarton-Lohéac G, Romano-Bertrand S, Blanc DS, van der Meer JR. Diversity and evolution of an abundant ICE clc family of integrative and conjugative elements in Pseudomonas aeruginosa. mSphere 2023; 8:e0051723. [PMID: 37902330 PMCID: PMC10732049 DOI: 10.1128/msphere.00517-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 09/24/2023] [Indexed: 10/31/2023] Open
Abstract
IMPORTANCE Microbial populations swiftly adapt to changing environments through horizontal gene transfer. While the mechanisms of gene transfer are well known, the impact of environmental conditions on the selection of transferred gene functions remains less clear. We investigated ICEs, specifically the ICEclc-type, in Pseudomonas aeruginosa clinical isolates. Our findings revealed co-evolution between ICEs and their hosts, with ICE transfers occurring within strains. Gene functions carried by ICEs are positively selected, including potential virulence factors and heavy metal resistance. Comparison to publicly available P. aeruginosa genomes unveiled widespread antibiotic-resistance determinants within ICEclc clades. Thus, the ubiquitous ICEclc family significantly contributes to P. aeruginosa's adaptation and fitness in diverse environments.
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Affiliation(s)
- Valentina Benigno
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
| | - Nicolas Carraro
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
| | - Garance Sarton-Lohéac
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
| | - Sara Romano-Bertrand
- Hydrosciences Montpellier, IRD, CNRS, University of Montpellier, Hospital Hygiene and Infection Control Team, University Hospital of Montpellier, Montpellier, France
| | - Dominique S. Blanc
- Prevention and Infection Control Unit, Infectious Diseases Service, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
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Kaszab E, Jiang D, Szabó I, Kriszt B, Urbányi B, Szoboszlay S, Sebők R, Bock I, Csenki-Bakos Z. Evaluating the In Vivo Virulence of Environmental Pseudomonas aeruginosa Using Microinjection Model of Zebrafish ( Danio rerio). Antibiotics (Basel) 2023; 12:1740. [PMID: 38136774 PMCID: PMC10740789 DOI: 10.3390/antibiotics12121740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/10/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
(1) Background: Microinjection of zebrafish (Danio rerio) embryos offers a promising model for studying the virulence and potential environmental risks associated with Pseudomonas aeruginosa. (2) Methods: This work aimed to develop a P. aeruginosa infection model using two parallel exposition pathways on zebrafish larvae with microinjection into the yolk and the perivitelline space to simultaneously detect the invasive and cytotoxic features of the examined strains. The microinjection infection model was validated with 15 environmental and clinical strains of P. aeruginosa of various origins, antibiotic resistance profiles, genotypes and phenotypes: both exposition pathways were optimized with a series of bacterial dilutions, different drop sizes (injection volumes) and incubation periods. Besides mortality, sublethal symptoms of the treated embryos were detected and analyzed. (3) Results: According to the statistical evaluation of our results, the optimal parameters (dilution, drop size and incubation period) were determined. (4) Conclusions: The tested zebrafish embryo microinjection infection model is now ready for use to determine the in vivo virulence and ecological risk of environmental P. aeruginosa.
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Affiliation(s)
- Edit Kaszab
- Department of Environmental Safety, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (E.K.); (D.J.); (S.S.); (R.S.)
| | - Dongze Jiang
- Department of Environmental Safety, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (E.K.); (D.J.); (S.S.); (R.S.)
| | - István Szabó
- Department of Environmental Toxicology, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (I.S.); (I.B.); (Z.C.-B.)
| | - Balázs Kriszt
- Department of Environmental Safety, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (E.K.); (D.J.); (S.S.); (R.S.)
| | - Béla Urbányi
- Department of Aquaculture, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary;
| | - Sándor Szoboszlay
- Department of Environmental Safety, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (E.K.); (D.J.); (S.S.); (R.S.)
| | - Rózsa Sebők
- Department of Environmental Safety, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (E.K.); (D.J.); (S.S.); (R.S.)
| | - Illés Bock
- Department of Environmental Toxicology, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (I.S.); (I.B.); (Z.C.-B.)
| | - Zsolt Csenki-Bakos
- Department of Environmental Toxicology, Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary; (I.S.); (I.B.); (Z.C.-B.)
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41
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Adeniji AA, Ayangbenro AS, Babalola OO. Draft genome sequence of active gold mine isolate Pseudomonas iranensis strain ABS_30. Microbiol Resour Announc 2023; 12:e0084923. [PMID: 37966236 PMCID: PMC10720498 DOI: 10.1128/mra.00849-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 10/13/2023] [Indexed: 11/16/2023] Open
Abstract
Pseudomonas iranensis ABS_30, isolated from gold mining soil, exhibits metal-resistant properties valuable for heavy metal removal. We report the draft genome sequencing of the P. iranensis ABS_30 strain, which is 5.9 Mb in size.
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Affiliation(s)
- Adetomiwa A. Adeniji
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Mmabatho, South Africa
- Center for Epidemic Response and Innovation, School of Data Science and Computational Thinking, Stellenbosch University, Cape Town, South Africa
| | - Ayansina S. Ayangbenro
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Mmabatho, South Africa
| | - Olubukola O. Babalola
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Mmabatho, South Africa
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42
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Xu S, Zheng P, Sun P, Chen P, Wu D. Biosynthesis of 3-Hydroxyphloretin Using Rational Design of 4-Hydroxyphenylacetate 3-Monooxygenase. J Agric Food Chem 2023; 71:19457-19464. [PMID: 38029276 DOI: 10.1021/acs.jafc.3c06479] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
The compound 3-hydroxyphloretin is a typical dihydrochalcone that can be obtained in plants by the 3-hydroxylation of phloretin. Here, the flavin-dependent two-component monooxygenase (HpaBC) derived from Pseudomonas aeruginosa was used to convert phloretin into 3-hydroxyphloretin. Following molecular docking and sequence alignment, modifications to the substrate pocket and loop of PaHpaBC were rationally designed, and mutant residues were selected. The results showed that the mutant Q212G/F292A/Q376N gave the best yield of 3-hydroxyphloretin and showed improved catalytic efficiency. Under optimal reaction condition, 2.03 g/L of 3-hydroxyphloretin was produced in the whole-cell catalysis experiment. Molecular docking and molecular dynamics simulations were used to analyze mutants and elucidate the potential mechanism. It was found that the increase in 3-hydroxyphloretin yield was due to the improvement in the flexibility of the loop and the expansion of its substrate pocket. This strategy based on loop and substrate pocket modification has significance in the engineering of PaHpaB.
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Affiliation(s)
- Shuping Xu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Pu Zheng
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Ping Sun
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Pengcheng Chen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Dan Wu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
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Gil-Gil T, Valverde JR, Martínez JL, Corona F. In vivo genetic analysis of Pseudomonas aeruginosa carbon catabolic repression through the study of CrcZ pseudo-revertants shows that Crc-mediated metabolic robustness is needed for proficient bacterial virulence and antibiotic resistance. Microbiol Spectr 2023; 11:e0235023. [PMID: 37902380 PMCID: PMC10714802 DOI: 10.1128/spectrum.02350-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 09/25/2023] [Indexed: 10/31/2023] Open
Abstract
IIMPORTANCE Hfq and Crc regulate P. aeruginosa carbon catabolic repression at the post-transcriptional level. In vitro work has shown that Hfq binds the target RNAs and Crc stabilizes the complex. A third element in the regulation is the small RNA CrcZ, which sequesters the Crc-Hfq complex under no catabolic repression conditions, allowing the translation of the target mRNAs. A ΔcrcZ mutant was generated and presented fitness defects and alterations in its virulence potential and antibiotic resistance. Eight pseudo-revertants that present different degrees of fitness compensation were selected. Notably, although Hfq is the RNA binding protein, most mutations occurred in Crc. This indicates that Crc is strictly needed for P. aeruginosa efficient carbon catabolic repression in vivo. The compensatory mutations restore in a different degree the alterations in antibiotic susceptibility and virulence of the ΔcrcZ mutant, supporting that Crc plays a fundamental role linking P. aeruginosa metabolic robustness, virulence, and antibiotic resistance.
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Mei M, Pheng P, Kurzeja-Edwards D, Diggle SP. High prevalence of lipopolysaccharide mutants and R2-pyocin susceptible variants in Pseudomonas aeruginosa populations sourced from cystic fibrosis lung infections. Microbiol Spectr 2023; 11:e0177323. [PMID: 37877708 PMCID: PMC10714928 DOI: 10.1128/spectrum.01773-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 09/15/2023] [Indexed: 10/26/2023] Open
Abstract
IMPORTANCE Cystic fibrosis (CF) patients often experience chronic, debilitating lung infections caused by antibiotic-resistant Pseudomonas aeruginosa, contributing to antimicrobial resistance (AMR). The genetic and phenotypic diversity of P. aeruginosa populations in CF lungs raises questions about their susceptibility to non-traditional antimicrobials, like bacteriocins. In this study, we focused on R-pyocins, a type of bacteriocin with high potency and a narrow killing spectrum. Our findings indicate that a large number of infectious CF variants are susceptible to R2-pyocins, even within diverse bacterial populations, supporting their potential use as therapeutic agents. The absence of a clear correlation between lipopolysaccharide (LPS) phenotypes and R-pyocin susceptibility suggests that LPS packing density may play a significant role in R-pyocin susceptibility among CF variants. Understanding the relationship between LPS phenotypes and R-pyocin susceptibility is crucial for developing effective treatments for these chronic infections.
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Affiliation(s)
- Madeline Mei
- School of Biological Sciences, Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, Georgia, USA
- Department of Pediatrics, Division of Pulmonary, Allergy and Immunology, Cystic Fibrosis, and Sleep, Emory University School of Medicine, Atlanta, Georgia, USA
- Emory+Children’s Center for Cystic Fibrosis and Airway Disease Research, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Preston Pheng
- School of Biological Sciences, Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Detriana Kurzeja-Edwards
- School of Biological Sciences, Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Stephen P. Diggle
- School of Biological Sciences, Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, Georgia, USA
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Alio I, Moll R, Hoffmann T, Mamat U, Schaible UE, Pappenfort K, Alawi M, Schie M, Thünauer R, Stamm J, Rohde H, Streit WR. Stenotrophomonas maltophilia affects the gene expression profiles of the major pathogens Pseudomonas aeruginosa and Staphylococcus aureus in an in vitro multispecies biofilm model. Microbiol Spectr 2023; 11:e0085923. [PMID: 37819084 PMCID: PMC10714729 DOI: 10.1128/spectrum.00859-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/21/2023] [Indexed: 10/13/2023] Open
Abstract
IMPORTANCE In the past, studies have focused on bacterial pathogenicity in mono-species infections, in part ignoring the clinical relevance of diseases caused by more than one pathogen (i.e., polymicrobial infections). However, it is now common knowledge that multiple bacteria species are often involved in the course of an infection. For treatment of such infections, it is absolutely important to understand the dynamics of species interactions at possible infection sites and the molecular mechanisms behind these interactions. Here, we studied the impact of Stenotrophomonas maltophilia on its commensals Pseudomonas aeruginosa and Staphylococcus aureus in multispecies biofilms. We analyzed the 3D structural architectures of dual- and triple-species biofilms, niche formation within the biofilms, and the interspecies interactions on a molecular level. RNAseq data identified key genes involved in multispecies biofilm formation and interaction as potential drug targets for the clinical combat of multispecies infection with these major pathogens.
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Affiliation(s)
- Ifey Alio
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Raphael Moll
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Tim Hoffmann
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Uwe Mamat
- Cellular Microbiology, Priority Research Area Infections, Research Center Borstel, Leibniz Lung Center,Leibniz Research Alliance Infection , Borstel Gemany, Borstel, Germany
| | - Ulrich E. Schaible
- Cellular Microbiology, Priority Research Area Infections, Research Center Borstel, Leibniz Lung Center,Leibniz Research Alliance Infection , Borstel Gemany, Borstel, Germany
| | - Kai Pappenfort
- Institute of Microbiology, Friedrich Schiller University of Jena, Jena, Germany
| | - Malik Alawi
- Bioinformatics Core, UKE Hamburg, Hamburg, Germany
| | - Marcel Schie
- LIV, Leibniz Institute of Experimental Virology, Hamburg, Germany
| | - Roland Thünauer
- LIV, Leibniz Institute of Experimental Virology, Hamburg, Germany
| | - Johanna Stamm
- Institute for Medical Microbiology, Virology and Hygiene, UKE, Eppendorf, Hamburg, Germany
| | - Holger Rohde
- Institute for Medical Microbiology, Virology and Hygiene, UKE, Eppendorf, Hamburg, Germany
| | - Wolfgang R. Streit
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
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46
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Schroven K, Putzeys L, Kerremans A, Ceyssens PJ, Vallino M, Paeshuyse J, Haque F, Yusuf A, Koch MD, Lavigne R. The phage-encoded PIT4 protein affects multiple two-component systems of Pseudomonas aeruginosa. Microbiol Spectr 2023; 11:e0237223. [PMID: 37962408 PMCID: PMC10714779 DOI: 10.1128/spectrum.02372-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 10/04/2023] [Indexed: 11/15/2023] Open
Abstract
IMPORTANCE More and more Pseudomonas aeruginosa isolates have become resistant to antibiotics like carbapenem. As a consequence, P. aeruginosa ranks in the top three of pathogens for which the development of novel antibiotics is the most crucial. The pathogen causes both acute and chronic infections, especially in patients who are the most vulnerable. Therefore, efforts are urgently needed to develop alternative therapies. One path explored in this article is the use of bacteriophages and, more specifically, phage-derived proteins. In this study, a phage-derived protein was studied that impacts key virulence factors of the pathogen via interaction with multiple histidine kinases of TCSs. The fundamental insights gained for this protein can therefore serve as inspiration for the development of an anti-virulence compound that targets the bacterial TCS.
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Affiliation(s)
- Kaat Schroven
- Laboratory of Gene Technology, KU Leuven, Leuven, Belgium
| | - Leena Putzeys
- Laboratory of Gene Technology, KU Leuven, Leuven, Belgium
| | | | | | - Marta Vallino
- Institute of Sustainable Plant Protection, National Research Council of Italy, Turin, Italy
| | - Jan Paeshuyse
- Host and Pathogen Interactions, KU Leuven, Leuven, Belgium
| | - Farhana Haque
- Department of Biology, Texas A&M University, College Station, Texas, USA
| | - Ahmed Yusuf
- Department of Biology, Texas A&M University, College Station, Texas, USA
| | - Matthias D. Koch
- Department of Biology, Texas A&M University, College Station, Texas, USA
| | - Rob Lavigne
- Laboratory of Gene Technology, KU Leuven, Leuven, Belgium
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47
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Maybin JA, Thompson TP, Flynn PB, Skvortsov T, Hickok NJ, Freeman TA, Gilmore BF. Cold atmospheric pressure plasma-antibiotic synergy in Pseudomonas aeruginosa biofilms is mediated via oxidative stress response. Biofilm 2023; 5:100122. [PMID: 37214348 PMCID: PMC10196807 DOI: 10.1016/j.bioflm.2023.100122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 04/06/2023] [Accepted: 04/06/2023] [Indexed: 05/24/2023] Open
Abstract
Cold atmospheric-pressure plasma (CAP) has emerged as a potential alternative or adjuvant to conventional antibiotics for the treatment of bacterial infections, including those caused by antibiotic-resistant pathogens. The potential of sub-lethal CAP exposures to synergise conventional antimicrobials for the eradication of Pseudomonas aeruginosa biofilms is investigated in this study. The efficacy of antimicrobials following or in the absence of sub-lethal CAP pre-treatment in P. aeruginosa biofilms was assessed. CAP pre-treatment resulted in an increase in both planktonic and biofilm antimicrobial sensitivity for all three strains tested (PAO1, PA14, and PA10548), with both minimum inhibitory concentrations (MICs) and minimum biofilm eradication concentrations (MBECs) of individual antimicrobials, being significantly reduced following CAP pre-treatment of the biofilm (512-fold reduction with ciprofloxacin/gentamicin; and a 256-fold reduction with tobramycin). At all concentrations of antimicrobial used, the combination of sub-lethal CAP exposure and antimicrobials was effective at increasing time-to-peak metabolism, as measured by isothermal microcalorimetry, again indicating enhanced susceptibility. CAP is known to damage bacterial cell membranes and DNA by causing oxidative stress through the in situ generation of reactive oxygen and nitrogen species (RONS). While the exact mechanism is not clear, oxidative stress on outer membrane proteins is thought to damage/perturb cell membranes, confirmed by ATP and LDH leakage, allowing antimicrobials to penetrate the bacterial cell more effectively, thus increasing bacterial susceptibility. Transcriptomic analysis, reveals that cold-plasma mediated oxidative stress caused upregulation of P. aeruginosa superoxide dismutase, cbb3 oxidases, catalases, and peroxidases, and upregulation in denitrification genes, suggesting that P. aeruginosa uses these enzymes to degrade RONS and mitigate the effects of cold plasma mediated oxidative stress. CAP treatment also led to an increased production of the signalling molecule ppGpp in P. aeruginosa, indicative of a stringent response being established. Although we did not directly measure persister cell formation, this stringent response may potentially be associated with the formation of persister cells in biofilm cultures. The production of ppGpp and polyphosphate may be associated with protein synthesis inhibition and increase efflux pump activity, factors which can result in antimicrobial tolerance. The transcriptomic analysis also showed that by 6 h post-treatment, there was downregulation in ribosome modulation factor, which is involved in the formation of persister cells, suggesting that the cells had begun to resuscitate/recover. In addition, CAP treatment at 4 h post-exposure caused downregulation of the virulence factors pyoverdine and pyocyanin; by 6 h post-exposure, virulence factor production was increasing. Transcriptomic analysis provides valuable insights into the mechanisms by which P. aeruginosa biofilms exhibits enhanced susceptibility to antimicrobials. Overall, these findings suggest, for the first time, that short CAP sub-lethal pre-treatment can be an effective strategy for enhancing the susceptibility of P. aeruginosa biofilms to antimicrobials and provides important mechanistic insights into cold plasma-antimicrobial synergy. Transcriptomic analysis of the response to, and recovery from, sub-lethal cold plasma exposures in P. aeruginosa biofilms improves our current understanding of cold plasma biofilm interactions.
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Affiliation(s)
- Jordanne-Amee Maybin
- Biofilm Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast, BT9 7BL, UK
| | - Thomas P Thompson
- Biofilm Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast, BT9 7BL, UK
| | - Padrig B Flynn
- Biofilm Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast, BT9 7BL, UK
| | - Timofey Skvortsov
- Biofilm Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast, BT9 7BL, UK
| | - Noreen J Hickok
- Department of Orthopaedic Surgery Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, 19107, USA
| | - Theresa A Freeman
- Department of Orthopaedic Surgery Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, 19107, USA
| | - Brendan F Gilmore
- Biofilm Research Group, School of Pharmacy, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast, BT9 7BL, UK
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK
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Porzio E, Andrenacci D, Manco G. Thermostable Lactonases Inhibit Pseudomonas aeruginosa Biofilm: Effect In Vitro and in Drosophila melanogaster Model of Chronic Infection. Int J Mol Sci 2023; 24:17028. [PMID: 38069351 PMCID: PMC10707464 DOI: 10.3390/ijms242317028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/23/2023] [Accepted: 11/28/2023] [Indexed: 12/18/2023] Open
Abstract
Pseudomonas aeruginosa is one of the six antimicrobial-resistant pathogens known as "ESKAPE" that represent a global threat to human health and are considered priority targets for the development of novel antimicrobials and alternative therapeutics. The virulence of P. aeruginosa is regulated by a four-chemicals communication system termed quorum sensing (QS), and one main class of QS signals is termed acylhomoserine lactones (acyl-HSLs), which includes 3-Oxo-dodecanoil homoserine lactone (3-Oxo-C12-HSL), which regulates the expression of genes implicated in virulence and biofilm formation. Lactonases, like Paraoxonase 2 (PON2) from humans and the phosphotriesterase-like lactonases (PLLs) from thermostable microorganisms, are able to hydrolyze acyl-HSLs. In this work, we explored in vitro and in an animal model the effect of some lactonases on the production of Pseudomonas virulence factors. This study presents a model of chronic infection in which bacteria were administered by feeding, and Drosophila adults were treated with enzymes and the antibiotic tobramycin, alone or in combination. In vitro, we observed significant effects of lactonases on biofilm formation as well as effects on bacterial motility and the expression of virulence factors. The treatment in vivo by feeding with the lactonase SacPox allowed us to significantly increase the biocidal effect of tobramycin in chronic infection.
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Affiliation(s)
- Elena Porzio
- Institute of Biochemistry and Cell Biology, National Research Council of Italy, Via P. Castellino 111, 80131 Naples, Italy
| | - Davide Andrenacci
- CNR Institute of Molecular Genetics “Luigi-Luca Cavalli-Sforza” Unit of Bologna, 40136 Bologna, Italy
| | - Giuseppe Manco
- Institute of Biochemistry and Cell Biology, National Research Council of Italy, Via P. Castellino 111, 80131 Naples, Italy
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49
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Valeeva L, Pudova D, Khabipova N, Shigapova L, Shagimardanova E, Rogov A, Tagirova T, Gimadeev Z, Sharipova M. The dataset on the draft whole-genome sequences of two Pseudomonas aeruginosa strains isolated from urine samples of patients with urinary tract diseases. Data Brief 2023; 51:109704. [PMID: 37965601 PMCID: PMC10641123 DOI: 10.1016/j.dib.2023.109704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 10/13/2023] [Accepted: 10/16/2023] [Indexed: 11/16/2023] Open
Abstract
Pseudomonas aeruginosa is a widespread multidrug-resistant opportunistic human pathogen with an extremely high mortality rate that leads to urinary tract infection morbidities in particular. Variability and dynamics in genome features and ecological flexibility help these bacteria adapt to many environments and hosts and underlie their broad antibiotic resistance. Overall, studies aimed at obtaining a deeper understanding of the genome organization of UTI-associated P. aeruginosa strains are of high importance for sustainable health care worldwide. Herein, we report the draft assembly of entire genomes of two P. aeruginosa strains, PA18 and PA23, isolated from voided urine of patients with urinary tract diseases (hydronephrosis and urolithiasis, respectively) and determine the most important genetic features for pathogenesis and virulence. Whole-genome sequencing and annotation of genomes revealed high similarity between the two UTI strains along with differences in comparison with other uropathogenic P. aeruginosa and reference strains. The 6 981 635 bp and 6 948 153 bp draft genome sequences with GC contents of 65.9% and 65.8%, respectively, provide new insights into the virulence genetic factors and genes associated with antimicrobial resistance. The whole genome data of PA18 and PA23 have been deposited in the NCBI GenBank database (accession numbers JAQRBF000000000.1 and JAQRBG000000000.1, respectively).
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Affiliation(s)
- L.R. Valeeva
- Laboratory of Agrobioengineering, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Parizhskoy Kommuny Str., 9, Kazan 420021, Russia
| | - D.S. Pudova
- Laboratory of Agrobioengineering, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Parizhskoy Kommuny Str., 9, Kazan 420021, Russia
| | - N.N. Khabipova
- Laboratory of Agrobioengineering, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Parizhskoy Kommuny Str., 9, Kazan 420021, Russia
| | - L.H. Shigapova
- ‘Regulatory genomics’ Research Center, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Volkova Str. 18, Kazan 420012, Russia
| | - E.I. Shagimardanova
- ‘Regulatory genomics’ Research Center, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Volkova Str. 18, Kazan 420012, Russia
| | - A.M. Rogov
- The Interdisciplinary Center “Analytical Microscopy”, Kazan (Volga Region) Federal University, Kazan (Volga Region) Federal University, Parizhskoy Kommuny Str., 9, Kazan 420021, Russia
| | - T.R. Tagirova
- The Laboratory of clinical bacteriology, the Republican Clinical Hospital of the Republic of Tatarstan, Orenburgskiy trakt, 138, Kazan, 420064, Russia
| | - Z.G. Gimadeev
- The Urological Department of the University Clinic in Kazan, Chekhova Str., 43, Kazan, 420043, Russia
| | - M.R. Sharipova
- Laboratory of Agrobioengineering, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Parizhskoy Kommuny Str., 9, Kazan 420021, Russia
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50
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Burmeister N, Zorn E, Preuss L, Timm D, Scharnagl N, Rohnke M, Wicha SG, Streit WR, Maison W. Low-Fouling and Antibacterial Polymer Brushes via Surface-Initiated Polymerization of a Mixed Zwitterionic and Cationic Monomer. Langmuir 2023. [PMID: 38033196 DOI: 10.1021/acs.langmuir.3c02657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
The use of surface-grafted polymer brushes with combined low-fouling and antibacterial functionality is an attractive strategy to fight biofilm formation. This report describes a new styrene derivative combining a quaternary ammonium group with a sulfobetaine group in one monomer. Surface-initiated polymerization of this monomer on titanium and a polyethylene (PE) base material gave bifunctional polymer brush layers. Grafting was achieved via surface-initiated atom transfer radical polymerization from titanium or heat-induced free-radical polymerization from plasma-activated PE. Both techniques gave charged polymer layers with a thickness of over 750 nm, as confirmed by ToF-SIMS-SPM measurements. The chemical composition of the brush polymers was confirmed by XPS and FT-IR analysis. The surface charge, characterized by the ζ potential, was positive at different pH values, and the number of solvent-accessible excess ammonium groups was found to be ∼1016 N+/cm2. This led to strong antibacterial activity against Gram-positive and Gram-negative bacteria that was superior to a structurally related contact-active polymeric quaternary ammonium brush. In addition to this antibacterial activity, good low-fouling properties of the dual-function polymer brushes against Gram-positive and Gram-negative bacteria were found. This dual functionality is most likely due to the combination of antibacterial quaternary ammonium groups with antifouling sulfobetaines. The combination of both groups in one monomer allows the preparation of bifunctional brush polymers with operationally simple polymerization techniques.
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Affiliation(s)
- Nils Burmeister
- Department of Chemistry, Universität Hamburg, Bundesstrasse 45, 20146 Hamburg, Germany
| | - Eilika Zorn
- Department of Chemistry, Universität Hamburg, Bundesstrasse 45, 20146 Hamburg, Germany
| | - Lena Preuss
- Department of Microbiology and Biotechnology, Universität Hamburg, Ohnhorststrasse 18, 22609 Hamburg, Germany
| | - Donovan Timm
- Department of Chemistry, Universität Hamburg, Bundesstrasse 45, 20146 Hamburg, Germany
| | - Nico Scharnagl
- Helmholtz-Zentrum Hereon GmbH, Institute of Surface Science, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Marcus Rohnke
- Justus-Liebig-Universität Gießen, Institute of Physical Chemistry, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Sebastian G Wicha
- Department of Chemistry, Universität Hamburg, Bundesstrasse 45, 20146 Hamburg, Germany
| | - Wolfgang R Streit
- Department of Microbiology and Biotechnology, Universität Hamburg, Ohnhorststrasse 18, 22609 Hamburg, Germany
| | - Wolfgang Maison
- Department of Chemistry, Universität Hamburg, Bundesstrasse 45, 20146 Hamburg, Germany
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