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Nour SA, Emam MTH, El-Sayed GM, Sakr EAE. Utilizing chitooligosaccharides from shrimp waste biodegradation via recombinant chitinase A: a promising approach for emulsifying hydrocarbon and bioremediation. Microb Cell Fact 2024; 23:126. [PMID: 38698402 PMCID: PMC11067288 DOI: 10.1186/s12934-024-02388-z] [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: 03/10/2024] [Accepted: 04/09/2024] [Indexed: 05/05/2024] Open
Abstract
BACKGROUND Hydrocarbon pollution stemming from petrochemical activities is a significant global environmental concern. Bioremediation, employing microbial chitinase-based bioproducts to detoxify or remove contaminants, presents an intriguing solution for addressing hydrocarbon pollution. Chitooligosaccharides, a product of chitin degradation by chitinase enzymes, emerge as key components in this process. Utilizing chitinaceous wastes as a cost-effective substrate, microbial chitinase can be harnessed to produce Chitooligosaccharides. This investigation explores two strategies to enhance chitinase productivity, firstly, statistical optimization by the Plackett Burman design approach to evaluating the influence of individual physical and chemical parameters on chitinase production, Followed by response surface methodology (RSM) which delvs into the interactions among these factors to optimize chitinase production. Second, to further boost chitinase production, we employed heterologous expression of the chitinase-encoding gene in E. coli BL21(DE3) using a suitable vector. Enhancing chitinase activity not only boosts productivity but also augments the production of Chitooligosaccharides, which are found to be used as emulsifiers. RESULTS In this study, we focused on optimizing the production of chitinase A from S. marcescens using the Plackett Burman design and response surface methods. This approach led to achieving a maximum activity of 78.65 U/mL. Subsequently, we cloned and expressed the gene responsible for chitinase A in E. coli BL21(DE3). The gene sequence, named SmChiA, spans 1692 base pairs, encoding 563 amino acids with a molecular weight of approximately 58 kDa. This sequence has been deposited in the NCBI GenBank under the accession number "OR643436". The purified recombinant chitinase exhibited a remarkable activity of 228.085 U/mL, with optimal conditions at a pH of 5.5 and a temperature of 65 °C. This activity was 2.9 times higher than that of the optimized enzyme. We then employed the recombinant chitinase A to effectively hydrolyze shrimp waste, yielding chitooligosaccharides (COS) at a rate of 33% of the substrate. The structure of the COS was confirmed through NMR and mass spectrometry analyses. Moreover, the COS demonstrated its utility by forming stable emulsions with various hydrocarbons. Its emulsification index remained stable across a wide range of salinity, pH, and temperature conditions. We further observed that the COS facilitated the recovery of motor oil, burned motor oil, and aniline from polluted sand. Gravimetric assessment of residual hydrocarbons showed a correlation with FTIR analyses, indicating the efficacy of COS in remediation efforts. CONCLUSIONS The recombinant chitinase holds significant promise for the biological conversion of chitinaceous wastes into chitooligosaccharides (COS), which proved its potential in bioremediation efforts targeting hydrocarbon-contaminated sand.
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Affiliation(s)
- Shaimaa A Nour
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre (NRC), 33 El-Behouth St., Giza, 12622, Dokki, Egypt.
| | - Maha T H Emam
- Genetics and Cytology Department, Biotechnology Research Institute, National Research Centre, Giza, Dokki, Egypt
| | - Ghada M El-Sayed
- Microbial Genetics Department, Biotechnology Research Institute, National Research Centre, Giza, Dokki, Egypt
| | - Ebtehag A E Sakr
- Botany Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Cairo, Egypt.
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Kumar M, Chakdar H, Pandiyan K, Thapa S, Shahid M, Singh A, Srivastava AK, Saxena AK. Bacterial chitinases: genetics, engineering and applications. World J Microbiol Biotechnol 2022; 38:252. [DOI: 10.1007/s11274-022-03444-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 10/18/2022] [Indexed: 11/16/2022]
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Samlali K, Alves CL, Jezernik M, Shih SCC. Droplet digital microfluidic system for screening filamentous fungi based on enzymatic activity. Microsyst Nanoeng 2022; 8:123. [PMID: 36438986 PMCID: PMC9681769 DOI: 10.1038/s41378-022-00456-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 07/24/2022] [Accepted: 09/13/2022] [Indexed: 06/16/2023]
Abstract
Fungal cell-wall-degrading enzymes have great utility in the agricultural and food industries. These cell-wall-degrading enzymes are known to have functions that can help defend against pathogenic organisms. The existing methods used to discover these enzymes are not well adapted to fungi culture and morphology, which prevents the proper evaluation of these enzymes. We report the first droplet-based microfluidic method capable of long-term incubation and low-voltage conditions to sort filamentous fungi inside nanoliter-sized droplets. The new method was characterized and validated in solid-phase media based on colloidal chitin such that the incubation of single spores in droplets was possible over multiple days (2-4 days) and could be sorted without droplet breakage. With long-term culture, we examined the activity of cell-wall-degrading enzymes produced by fungi during solid-state droplet fermentation using three highly sensitive fluorescein-based substrates. We also used the low-voltage droplet sorter to select clones with highly active cell-wall-degrading enzymes, such as chitinases, β-glucanases, and β-N-acetylgalactosaminidases, from a filamentous fungi droplet library that had been incubated for >4 days. The new system is portable, affordable for any laboratory, and user-friendly compared to classical droplet-based microfluidic systems. We propose that this system will be useful for the growing number of scientists interested in fungal microbiology who are seeking high-throughput methods to incubate and sort a large library of fungal cells.
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Affiliation(s)
- Kenza Samlali
- Department of Electrical and Computer Engineering, Concordia University, Montréal, QC Canada
- Centre for Applied Synthetic Biology, Concordia University, Montréal, QC Canada
| | - Chiara Leal Alves
- Department of Electrical and Computer Engineering, Concordia University, Montréal, QC Canada
- Centre for Applied Synthetic Biology, Concordia University, Montréal, QC Canada
| | - Mara Jezernik
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON Canada
| | - Steve C. C. Shih
- Department of Electrical and Computer Engineering, Concordia University, Montréal, QC Canada
- Centre for Applied Synthetic Biology, Concordia University, Montréal, QC Canada
- Department of Biology, Concordia University, Montréal, QC Canada
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Reina JC, Pérez P, Llamas I. Quorum Quenching Strains Isolated from the Microbiota of Sea Anemones and Holothurians Attenuate Vibriocorallilyticus Virulence Factors and Reduce Mortality in Artemiasalina. Microorganisms 2022; 10:microorganisms10030631. [PMID: 35336206 PMCID: PMC8950658 DOI: 10.3390/microorganisms10030631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/08/2022] [Accepted: 03/14/2022] [Indexed: 01/19/2023] Open
Abstract
Interference with quorum-sensing (QS) intercellular communication systems by the enzymatic disruption of N-acylhomoserine lactones (AHLs) in Gram-negative bacteria has become a promising strategy to fight bacterial infections. In this study, seven strains previously isolated from marine invertebrates and selected for their ability to degrade C6 and C10-HSL, were identified as Acinetobacter junii, Ruegeria atlantica, Microbulbifer echini, Reinheimera aquimaris, and Pseudomonas sihuiensis. AHL-degrading activity against a wide range of synthetic AHLs were identified by using an agar well diffusion assay and Agrobacterium tumefaciens NTL4 and Chromobacterium violaceum CV026 and VIR07 as biosensors. High-performance liquid chromatography-mass spectrometry (HPLC-MS) analysis indicated that this activity was not due to an AHL lactonase. All the strains degraded Vibrio coralliilyticus AHLs in coculture experiments, while some strains reduced or abolished the production of virulence factors. In vivo assays showed that strains M3-111 and M3-127 reduced this pathogen’s virulence and increased the survival rate of Artemia salina up to 3-fold, indicating its potential use for biotechnological purposes. To our knowledge, this is the first study to describe AHL-degrading activities in some of these marine species. These findings highlight that the microbiota associated with marine invertebrates constitute an important underexplored source of biological valuable compounds.
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Affiliation(s)
- José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.R.); (P.P.)
| | - Pedro Pérez
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.R.); (P.P.)
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.R.); (P.P.)
- Biomedical Research Center (CIBM), Institute of Biotechnology, University of Granada, 18100 Granada, Spain
- Correspondence:
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Torres M, Hong KW, Chong TM, Reina JC, Chan KG, Dessaux Y, Llamas I. Genomic analyses of two Alteromonas stellipolaris strains reveal traits with potential biotechnological applications. Sci Rep 2019; 9:1215. [PMID: 30718637 PMCID: PMC6361997 DOI: 10.1038/s41598-018-37720-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 11/27/2018] [Indexed: 11/08/2022] Open
Abstract
The Alteromonas stellipolaris strains PQQ-42 and PQQ-44, previously isolated from a fish hatchery, have been selected on the basis of their strong quorum quenching (QQ) activity, as well as their ability to reduce Vibrio-induced mortality on the coral Oculina patagonica. In this study, the genome sequences of both strains were determined and analyzed in order to identify the mechanism responsible for QQ activity. Both PQQ-42 and PQQ-44 were found to degrade a wide range of N-acylhomoserine lactone (AHL) QS signals, possibly due to the presence of an aac gene which encodes an AHL amidohydrolase. In addition, the different colony morphologies exhibited by the strains could be related to the differences observed in genes encoding cell wall biosynthesis and exopolysaccharide (EPS) production. The PQQ-42 strain produces more EPS (0.36 g l-1) than the PQQ-44 strain (0.15 g l-1), whose chemical compositions also differ. Remarkably, PQQ-44 EPS contains large amounts of fucose, a sugar used in high-value biotechnological applications. Furthermore, the genome of strain PQQ-42 contained a large non-ribosomal peptide synthase (NRPS) cluster with a previously unknown genetic structure. The synthesis of enzymes and other bioactive compounds were also identified, indicating that PQQ-42 and PQQ-44 could have biotechnological applications.
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Affiliation(s)
- Marta Torres
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
- Institute for Integrative Biology of the Cell (I2BC), CEA/CNRS/University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, France
| | - Kar-Wai Hong
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Teik-Min Chong
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Kok-Gan Chan
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
- International Genome Centre, Jiangsu University, Zhenjiang, China
| | - Yves Dessaux
- Institute for Integrative Biology of the Cell (I2BC), CEA/CNRS/University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, France.
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
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Rodríguez M, Marín A, Torres M, Béjar V, Campos M, Sampedro I. Aphicidal Activity of Surfactants Produced by Bacillus atrophaeus L193. Front Microbiol 2018; 9:3114. [PMID: 30619189 PMCID: PMC6305586 DOI: 10.3389/fmicb.2018.03114] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 12/03/2018] [Indexed: 11/13/2022] Open
Abstract
The biosurfactants produced by Bacillus atrophaeus L193 was examined by their use in the control of the aphid Rhopalosiphum padi in order to suggest a friendly alternative to chemical pesticides. A screening of different culture media demonstrated the highest biosurfactant production by L193 in TSB supplemented with colloidal chitin. Surfactants, which are produced in large quantities (2.04 g/L), reduce surface tension to 33 mN/m. Electrospray Q-TOFS MS analysis demonstrated that lipopeptides, such as surfactins, fengycins, bacillomycins and iturins, are the predominant metabolites present in biosurfactants produced by strain L193. Treatment with L193 surfactants led to an aphid mortality rate of 59.8% within 24 h. Microscopy analysis showed that these compounds caused insect death by affecting cuticle membranes. An evaluation of aphid feeding activity also demonstrated that aphid feeding capacity is affected by treatment with surfactants. Moreover, microbial cultures of strain L193 and their supernatants also showed high levels of activity against R. padi, which is probably due to the presence of surfactants and hydrolytic enzymes such as proteases and glucanases. This study demonstrates that B. atrophaeus L193 is an effective treatment for plants affected by aphids.
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Affiliation(s)
- Miguel Rodríguez
- Department of Microbiology, Pharmacy Faculty, Microbial Exopolysaccharide Research Group, Granada, Spain.,Biomedical Research Center (CIBM), Biotechnology Institute, Granada, Spain
| | - Ana Marín
- Department of Microbiology, Pharmacy Faculty, Microbial Exopolysaccharide Research Group, Granada, Spain.,Biomedical Research Center (CIBM), Biotechnology Institute, Granada, Spain
| | - Marta Torres
- Department of Microbiology, Pharmacy Faculty, Microbial Exopolysaccharide Research Group, Granada, Spain.,Biomedical Research Center (CIBM), Biotechnology Institute, Granada, Spain.,Institute for Integrative Biology of the Cell (I2BC), CEA/CNRS/University of Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, France
| | - Victoria Béjar
- Department of Microbiology, Pharmacy Faculty, Microbial Exopolysaccharide Research Group, Granada, Spain.,Biomedical Research Center (CIBM), Biotechnology Institute, Granada, Spain
| | - Mercedes Campos
- Department of Plant Protection, Estación Experimental del Zaidín, Spanish National Research Council, Granada, Spain
| | - Inmaculada Sampedro
- Department of Microbiology, Pharmacy Faculty, Microbial Exopolysaccharide Research Group, Granada, Spain.,Biomedical Research Center (CIBM), Biotechnology Institute, Granada, Spain
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Torres M, Reina JC, Fuentes-Monteverde JC, Fernández G, Rodríguez J, Jiménez C, Llamas I. AHL-lactonase expression in three marine emerging pathogenic Vibrio spp. reduces virulence and mortality in brine shrimp (Artemia salina) and Manila clam (Venerupis philippinarum). PLoS One 2018; 13:e0195176. [PMID: 29664914 PMCID: PMC5903640 DOI: 10.1371/journal.pone.0195176] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/16/2018] [Indexed: 11/19/2022] Open
Abstract
Bacterial infectious diseases produced by Vibrio are the main cause of economic losses in aquaculture. During recent years it has been shown that the expression of virulence genes in some Vibrio species is controlled by a population-density dependent gene-expression mechanism known as quorum sensing (QS), which is mediated by the diffusion of signal molecules such as N-acylhomoserine lactones (AHLs). QS disruption, especially the enzymatic degradation of signalling molecules, known as quorum quenching (QQ), is one of the novel therapeutic strategies for the treatment of bacterial infections. In this study, we present the detection of AHLs in 34 marine Vibrionaceae strains. Three aquaculture-related pathogenic Vibrio strains, V. mediterranei VibC-Oc-097, V. owensii VibC-Oc-106 and V. coralliilyticus VibC-Oc-193 were selected for further studies based on their virulence and high production of AHLs. This is the first report where the signal molecules have been characterized in these emerging marine pathogens and correlated to the expression of virulence factors. Moreover, the results of AHL inactivation in the three selected strains have been confirmed in vivo against brine shrimps (Artemia salina) and Manila clams (Venerupis philippinarum). This research contributes to the development of future therapies based on AHL disruption, the most promising alternatives for fighting infectious diseases in aquaculture.
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Affiliation(s)
- Marta Torres
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
| | - José Carlos Reina
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Juan Carlos Fuentes-Monteverde
- Department of Chemistry, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of A Coruña, A Coruña, Spain
| | - Gerardo Fernández
- Research Support Service (SAI), Central Services (ESCI) University of A Coruña, A Coruña, Spain
| | - Jaime Rodríguez
- Department of Chemistry, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of A Coruña, A Coruña, Spain
| | - Carlos Jiménez
- Department of Chemistry, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of A Coruña, A Coruña, Spain
| | - Inmaculada Llamas
- Department of Microbiology, Faculty of Pharmacy, University of Granada, Granada, Spain
- Institute of Biotechnology, Biomedical Research Center (CIBM), University of Granada, Granada, Spain
- * E-mail:
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Torres M, Rubio-Portillo E, Antón J, Ramos-Esplá AA, Quesada E, Llamas I. Selection of the N-Acylhomoserine Lactone-Degrading Bacterium Alteromonas stellipolaris PQQ-42 and of Its Potential for Biocontrol in Aquaculture. Front Microbiol 2016; 7:646. [PMID: 27242684 PMCID: PMC4860449 DOI: 10.3389/fmicb.2016.00646] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 04/18/2016] [Indexed: 12/26/2022] Open
Abstract
The production of virulence factors by many pathogenic microorganisms depends on the intercellular communication system called quorum sensing, which involves the production and release of signal molecules known as autoinducers. Based on this, new-therapeutic strategies have emerged for the treatment of a variety of infections, such as the enzymatic degradation of signaling molecules, known as quorum quenching (QQ). In this study, we present the screening of QQ activity amongst 450 strains isolated from a bivalve hatchery in Granada (Spain), and the selection of the strain PQQ-42, which degrades a wide range of N-acylhomoserine lactones (AHLs). The selected strain, identified as Alteromonas stellipolaris, degraded the accumulation of AHLs and reduced the production of protease and chitinase and swimming motility of a Vibrio species in co-cultivation experiments in vitro. In the bio-control experiment, strain PQQ-42 significantly reduced the pathogenicity of Vibrio mediterranei VibC-Oc-097 upon the coral Oculina patagonica showing a lower degree of tissue damage (29.25 ± 14.63%) in its presence, compared to when the coral was infected with V. mediterranei VibC-Oc-097 alone (77.53 ± 13.22%). Our results suggest that this AHL-degrading bacterium may have biotechnological applications in aquaculture.
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Affiliation(s)
- Marta Torres
- Faculty of Pharmacy, Department of Microbiology, University of GranadaGranada, Spain; Biomedical Research Centre (CIBM), Institute of Biotechnology, University of GranadaGranada, Spain
| | - Esther Rubio-Portillo
- Department of Marine Science and Applied Biology, University of Alicante Alicante, Spain
| | - Josefa Antón
- Department of Physiology, Genetics and Microbiology, University of Alicante Alicante, Spain
| | - Alfonso A Ramos-Esplá
- Department of Marine Science and Applied Biology, University of Alicante Alicante, Spain
| | - Emilia Quesada
- Faculty of Pharmacy, Department of Microbiology, University of GranadaGranada, Spain; Biomedical Research Centre (CIBM), Institute of Biotechnology, University of GranadaGranada, Spain
| | - Inmaculada Llamas
- Faculty of Pharmacy, Department of Microbiology, University of GranadaGranada, Spain; Biomedical Research Centre (CIBM), Institute of Biotechnology, University of GranadaGranada, Spain
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Tsai YL, Wang MC, Hsueh PR, Liu MC, Hu RM, Wu YJ, Liaw SJ. Overexpression of an outer membrane protein associated with decreased susceptibility to carbapenems in Proteus mirabilis. PLoS One 2015; 10:e0120395. [PMID: 25756370 DOI: 10.1371/journal.pone.0120395] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 01/21/2015] [Indexed: 11/19/2022] Open
Abstract
Proteus mirabilis isolates commonly have decreased susceptibility to imipenem. Previously, we found P. mirabilis hfq mutant was more resistant to imipenem and an outer membrane protein (OMP) could be involved. Therefore, we investigated the role of this OMP in carbapenem susceptibility. By SDS-PAGE we found this OMP (named ImpR) was increased in hfq mutant and LC-MS/MS revealed it to be the homologue of Salmonella YbfM, which is a porin for chitobiose and subject to MicM (a small RNA) regulation. We demonstrated that ImpR overexpression resulted in increased carbapenem MICs in the laboratory strain and clinical isolates. Chitobiose induced expression of chb (a chitobiose utilization operon). Real-time RT-PCR and SDS-PAGE were performed to elucidate the relationship of hfq, impR, chb and MicM in P. mirabilis. We found MicM RNA was decreased in hfq mutant and chbBC-intergenic region (chbBC-IGR) overexpression strain (chbIGRov), while impR mRNA was increased in hfq mutant, micM mutant and chbIGRov strain. In addition, mutation of hfq or micM and overexpression of chbBC-IGR increased ImpR protein level. Accordingly, chitobiose made wild-type have higher levels of ImpR protein and are more resistant to carbapenems. Hfq- and MicM-complemented strains restored wild-type MICs. Mutation of both impR and hfq eliminated the increase in carbapenem MICs observed in hfq mutant and ImpR-complementation of hfq/impR double mutant resulted in MICs as hfq mutant, indicating that the ImpR-dependent decreased carbapenem susceptibility of hfq mutant. These indicate MicM was antisense to impR mRNA and was negatively-regulated by chbBC-IGR. Together, overexpression of ImpR contributed to the decreased carbapenem susceptibility in P. mirabilis.
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Zhang D, Bland JM, Xu D, Chung S. Degradation of Chitin and Chitosan by a Recombinant Chitinase Derived from a Virulent <i>Aeromonas hydrophila</i> Isolated from Diseased Channel Catfish. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/aim.2015.59064] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Buitimea-Cantúa GV, Rosas-Burgos EC, Cinco-Moroyoqui FJ, Burgos-Hernández A, Plascencia-Jatomea M, Cortez-Rocha MO, Gálvez-Ruiz JC. In Vitro
Effect of Antifungal Fractions from the Plants B
accharis glutinosa
and J
acquinia macrocarpa
on Chitin and β-1,3-Glucan Hydrolysis of Maize Phytopathogenic Fungi and on the Fungal β-1,3-Glucanase and Chitinase Activities. J Food Saf 2013. [DOI: 10.1111/jfs.12085] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Génesis Vidal Buitimea-Cantúa
- Departamento de Investigación y Posgrado en Alimentos; Universidad de Sonora; Blvd. Luis Encinas y Rosales s/n Col. Centro, P.O. Box 1658 C.P. 83000 Hermosillo Sonora México
| | - Ema Carina Rosas-Burgos
- Departamento de Investigación y Posgrado en Alimentos; Universidad de Sonora; Blvd. Luis Encinas y Rosales s/n Col. Centro, P.O. Box 1658 C.P. 83000 Hermosillo Sonora México
| | - Francisco Javier Cinco-Moroyoqui
- Departamento de Investigación y Posgrado en Alimentos; Universidad de Sonora; Blvd. Luis Encinas y Rosales s/n Col. Centro, P.O. Box 1658 C.P. 83000 Hermosillo Sonora México
| | - Armando Burgos-Hernández
- Departamento de Investigación y Posgrado en Alimentos; Universidad de Sonora; Blvd. Luis Encinas y Rosales s/n Col. Centro, P.O. Box 1658 C.P. 83000 Hermosillo Sonora México
| | - Maribel Plascencia-Jatomea
- Departamento de Investigación y Posgrado en Alimentos; Universidad de Sonora; Blvd. Luis Encinas y Rosales s/n Col. Centro, P.O. Box 1658 C.P. 83000 Hermosillo Sonora México
| | - Mario Onofre Cortez-Rocha
- Departamento de Investigación y Posgrado en Alimentos; Universidad de Sonora; Blvd. Luis Encinas y Rosales s/n Col. Centro, P.O. Box 1658 C.P. 83000 Hermosillo Sonora México
| | - Juan Carlos Gálvez-Ruiz
- Departamento de Ciencias Químico Biológicas; Universidad de Sonora; Hermosillo Sonora México
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Chao CF, Chen YY, Cheng CY, Li YK. Catalytic function of a newly purified exo-β-d-glucosaminidase from the entomopathogenic fungus Paecilomyces lilacinus. Carbohydr Polym 2013; 93:615-21. [DOI: 10.1016/j.carbpol.2012.12.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 12/10/2012] [Accepted: 12/14/2012] [Indexed: 11/15/2022]
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