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David A, Tahrioui A, Duchesne R, Tareau AS, Maillot O, Barreau M, Feuilloley MGJ, Lesouhaitier O, Cornelis P, Bouffartigues E, Chevalier S. Membrane fluidity homeostasis is required for tobramycin-enhanced biofilm in Pseudomonas aeruginosa. Microbiol Spectr 2024; 12:e0230323. [PMID: 38411953 PMCID: PMC10986583 DOI: 10.1128/spectrum.02303-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 02/04/2024] [Indexed: 02/28/2024] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen, which causes chronic infections, especially in cystic fibrosis (CF) patients where it colonizes the lungs via the build-up of biofilms. Tobramycin, an aminoglycoside, is often used to treat P. aeruginosa infections in CF patients. Tobramycin at sub-minimal inhibitory concentrations enhances both biofilm biomass and thickness in vitro; however, the mechanism(s) involved are still unknown. Herein, we show that tobramycin increases the expression and activity of SigX, an extracytoplasmic sigma factor known to be involved in the biosynthesis of membrane lipids and membrane fluidity homeostasis. The biofilm enhancement by tobramycin is not observed in a sigX mutant, and the sigX mutant displays increased membrane stiffness. Remarkably, the addition of polysorbate 80 increases membrane fluidity of sigX-mutant cells in biofilm, restoring the tobramycin-enhanced biofilm formation. Our results suggest the involvement of membrane fluidity homeostasis in biofilm development upon tobramycin exposure.IMPORTANCEPrevious studies have shown that sub-lethal concentrations of tobramycin led to an increase biofilm formation in the case of infections with the opportunistic pathogen Pseudomonas aeruginosa. We show that the mechanism involved in this phenotype relies on the cell envelope stress response, triggered by the extracytoplasmic sigma factor SigX. This phenotype was abolished in a sigX-mutant strain. Remarkably, we show that increasing the membrane fluidity of the mutant strain is sufficient to restore the effect of tobramycin. Altogether, our data suggest the involvement of membrane fluidity homeostasis in biofilm development upon tobramycin exposure.
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Affiliation(s)
- Audrey David
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Ali Tahrioui
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Rachel Duchesne
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Anne-Sophie Tareau
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Olivier Maillot
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Magalie Barreau
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Marc G. J. Feuilloley
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Olivier Lesouhaitier
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Pierre Cornelis
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Emeline Bouffartigues
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
| | - Sylvie Chevalier
- Unité de recherche Communication Bactérienne et Stratégies Anti-infectieuses, CBSA UR4312, Université de Rouen Normandie, Normandie Université, Evreux, France
- Fédération de Recherche Normande Sécurité Sanitaire, bien être, Aliment Durable (SéSAD), Evreux, France
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Cornelis P, Tahrioui A, Lesouhaitier O, Bouffartigues E, Feuilloley M, Baysse C, Chevalier S. High affinity iron uptake by pyoverdine in Pseudomonas aeruginosa involves multiple regulators besides Fur, PvdS, and FpvI. Biometals 2023; 36:255-261. [PMID: 35171432 DOI: 10.1007/s10534-022-00369-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 02/03/2022] [Indexed: 11/02/2022]
Abstract
Pseudomonas aeruginosa is a Gram-negative bacterium which can cause serious infections among immune-depressed people including cystic fibrosis patients where it can colonize the lungs causing chronic infections. Iron is essential for P. aeruginosa and can be provided via three sources under aerobic conditions: its own siderophores pyochelin (PCH) and pyoverdine (PVD), xenosiderophores, or heme, respectively. Pyoverdine is the high affinity siderophore and its synthesis and uptake involve more than 30 genes organized in different operons. Its synthesis and uptake are triggered by iron scarcity via the Fur regulator and involves two extra cytoplasmic sigma factors (ECF), PvdS for the biosynthesis of PVD and FpvI for the uptake via the TonB-dependent FpvA outer membrane transporter and other periplasmic and inner membrane proteins. It appeared recently that the regulation of PVD biosynthesis and uptake involves other regulators, including other ECF factors, and LysR regulators. This is the case especially for the genes coding for periplasmic and inner membrane proteins involved in the reduction of Fe3+ to Fe2+ and the transport of ferrous iron to the cytoplasm that appears to represent a crucial step in the uptake process.
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Affiliation(s)
- Pierre Cornelis
- Laboratory of Microbiology Signals and Microenvironnements (LMSM) EA 4312, University of Rouen Normandy, 27000, Evreux, France.
- Laboratorium Microbiologie, Vrije Universiteit Brussel, Brussels, Belgium.
| | - Ali Tahrioui
- Laboratory of Microbiology Signals and Microenvironnements (LMSM) EA 4312, University of Rouen Normandy, 27000, Evreux, France
| | - Olivier Lesouhaitier
- Laboratory of Microbiology Signals and Microenvironnements (LMSM) EA 4312, University of Rouen Normandy, 27000, Evreux, France
| | - Emeline Bouffartigues
- Laboratory of Microbiology Signals and Microenvironnements (LMSM) EA 4312, University of Rouen Normandy, 27000, Evreux, France
| | - Marc Feuilloley
- Laboratory of Microbiology Signals and Microenvironnements (LMSM) EA 4312, University of Rouen Normandy, 27000, Evreux, France
| | - Christine Baysse
- CNRS, Institut de Génétique et de Développement de Rennes (IGDR), UMR6290, Université de Rennes, Rennes, France
| | - Sylvie Chevalier
- Laboratory of Microbiology Signals and Microenvironnements (LMSM) EA 4312, University of Rouen Normandy, 27000, Evreux, France
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3
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Tang Y, Shi Y, Jia B, Zhang Y, Wang Q. Evolution and function analysis of glycerol kinase GlpK in Pseudomonasaeruginosa. Biochem Biophys Res Commun 2023; 645:30-39. [PMID: 36680934 DOI: 10.1016/j.bbrc.2022.12.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 12/20/2022] [Indexed: 01/13/2023]
Abstract
Pseudomonas aeruginosa is a Gram-negative bacterium capable of widespread niches, which is also one of the main bacteria that cause patient infection. The metabolic diversity of Pseudomonas aeruginosa is an essential factor in adapting to a variety of environments. Based on the previous studies, adaptive genetic variation in the glycerol kinase GlpK, the glycerol 3-phosphotransferase, contributes to the fitness of bacteria in human bodies, such as Mycobacterium tuberculosis and Escherichia coli. Thus, this study aimed to explore the molecular evolution and function of glpK in P. aeruginosa. Using extensive population genomic data, we have identified the prevalence of two glpK copies in P. aeruginosa that clustered into distinct branches, which were later known as Clade 1 and 2. The evolution analysis revealed that glpK in Clade 1 derived from an ancestral P. aeruginosa species and the other from an ancient horizontal gene transfer event. In addition, we confirmed that the GlpK in Clade 2 still retained glycerol kinase activity but was much weaker than that of GlpK in Clade 1. We demonstrated the importance of the critical amino acid Q70 in GlpK glycerol kinase activity by point mutation. Furthermore, Co-expression network analysis implied that the two glpK copies of P. aeruginosa regulate separate networks and may be a strategy to improve fitness in P. aeruginosa.
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Affiliation(s)
- Yao Tang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Yuqi Shi
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Boshuang Jia
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Yunhua Zhang
- School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui, 230000, China.
| | - Qiang Wang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, 210023, China.
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4
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Tribelli PM, López NI. Insights into the temperature responses of Pseudomonas species in beneficial and pathogenic host interactions. Appl Microbiol Biotechnol 2022; 106:7699-7709. [PMID: 36271255 DOI: 10.1007/s00253-022-12243-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 09/30/2022] [Accepted: 10/12/2022] [Indexed: 11/28/2022]
Abstract
Pseudomonas species are metabolically versatile bacteria able to exploit a wide range of ecological niches. Different Pseudomonas species can grow as free-living cells, biofilms, or associated with plants or animals, including humans, and their ecological success partially lies in their ability to grow and adapt to different temperatures. These bacteria are relevant for human activities, due to their clinical importance and their biotechnological potential for different applications such as bioremediation and the production of biopolymers, surfactants, secondary metabolites, and enzymes. In agriculture, some of them can act as plant growth promoters and are thus used as inoculants, whereas others, like P. syringae pathovars, can cause disease in commercial crops. This review aims to provide an overview of the temperature-response mechanisms in Pseudomonas species, looking for novel features or strategies based on techniques such as transcriptomics and proteomics. We focused on temperature-dependent traits mainly associated with virulence, host colonization, survival, and production of secondary metabolites. We analyzed human, animal, and plant pathogens and plant growth-promoting Pseudomonas species, including P. aeruginosa, P. plecoglossicida, several P. syringae pathovars, and P. protegens. Our aim was to provide a comprehensive view of the relevance of temperature-response traits in human and animal health and agricultural applications. Our analysis showed that features relevant to the bacterial-host interaction are adjusted to the environmental or host temperature regardless of the optimal growth temperature in the laboratory, and thus contribute to improving bacterial fitness. KEY POINTS: • In Pseudomonas species, temperature impacts the bacterial-host interaction. • Interaction traits are expressed at temperatures different from the optimal reported. • The bacterial-host interaction could be affected by climate change.
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Affiliation(s)
- Paula M Tribelli
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428EGA, Buenos Aires, Argentina. .,IQUIBICEN-CONICET, Buenos Aires, Argentina.
| | - Nancy I López
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428EGA, Buenos Aires, Argentina.,IQUIBICEN-CONICET, Buenos Aires, Argentina
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5
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Louis M, Tahrioui A, Verdon J, David A, Rodrigues S, Barreau M, Manac’h M, Thiroux A, Luton B, Dupont C, Calvé ML, Bazire A, Crépin A, Clabaut M, Portier E, Taupin L, Defontaine F, Clamens T, Bouffartigues E, Cornelis P, Feuilloley M, Caillon J, Dufour A, Berjeaud JM, Lesouhaitier O, Chevalier S. Effect of Phthalates and Their Substitutes on the Physiology of Pseudomonas aeruginosa. Microorganisms 2022; 10:microorganisms10091788. [PMID: 36144390 PMCID: PMC9502294 DOI: 10.3390/microorganisms10091788] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/26/2022] [Accepted: 09/01/2022] [Indexed: 11/16/2022] Open
Abstract
Phthalates are used in a variety of applications—for example, as plasticizers in polyvinylchloride products to improve their flexibility—and can be easily released into the environment. In addition to being major persistent organic environmental pollutants, some phthalates are responsible for the carcinogenicity, teratogenicity, and endocrine disruption that are notably affecting steroidogenesis in mammals. Numerous studies have thus focused on deciphering their effects on mammals and eukaryotic cells. While multicellular organisms such as humans are known to display various microbiota, including all of the microorganisms that may be commensal, symbiotic, or pathogenic, few studies have aimed at investigating the relationships between phthalates and bacteria, notably regarding their effects on opportunistic pathogens and the severity of the associated pathologies. Herein, the effects of phthalates and their substitutes were investigated on the human pathogen, Pseudomonas aeruginosa, in terms of physiology, virulence, susceptibility to antibiotics, and ability to form biofilms. We show in particular that most of these compounds increased biofilm formation, while some of them enhanced the bacterial membrane fluidity and altered the bacterial morphology.
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Affiliation(s)
- Mélissande Louis
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Ali Tahrioui
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Julien Verdon
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- CNRS UMR7267 Ecologie et Biologie des Interactions (EBI), Université de Poitiers, F-86000 Poitiers, France
| | - Audrey David
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Sophie Rodrigues
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Magalie Barreau
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Maëliss Manac’h
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Audrey Thiroux
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- CNRS UMR7267 Ecologie et Biologie des Interactions (EBI), Université de Poitiers, F-86000 Poitiers, France
| | - Baptiste Luton
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Charly Dupont
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Marie Le Calvé
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Alexis Bazire
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Alexandre Crépin
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- CNRS UMR7267 Ecologie et Biologie des Interactions (EBI), Université de Poitiers, F-86000 Poitiers, France
| | - Maximilien Clabaut
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- CNRS UMR7267 Ecologie et Biologie des Interactions (EBI), Université de Poitiers, F-86000 Poitiers, France
| | - Emilie Portier
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Laure Taupin
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Florian Defontaine
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Thomas Clamens
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Emeline Bouffartigues
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Pierre Cornelis
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Marc Feuilloley
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Jocelyne Caillon
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- EA3826 Thérapeutiques Cliniques et Expérimentales des Infections, Faculté de Médecine, Université de Nantes, F-44000 Nantes, France
| | - Alain Dufour
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Université de Bretagne-Sud, EA 3884, LBCM, IUEM, F-56100 Lorient, France
| | - Jean-Marc Berjeaud
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- CNRS UMR7267 Ecologie et Biologie des Interactions (EBI), Université de Poitiers, F-86000 Poitiers, France
| | - Olivier Lesouhaitier
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
| | - Sylvie Chevalier
- Unité de Recherche Communication Bactérienne et Stratégies Anti-Infectieuses, CBSA UR4312, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- SéSAD, Fédération de Recherche “Sécurité Sanitaire, Bien Être, Aliment Durable”, Université de Rouen-Normandie, Normandie Université, F-27000 Évreux, France
- IMPERIAL Project Consortium, ANSES, F-94706 Maisons-Alfort, France
- Correspondence: ; Tel.: +33-2-32-29-15-60
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6
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Sauvage S, Gaviard C, Tahrioui A, Coquet L, Le H, Alexandre S, Ben Abdelkrim A, Bouffartigues E, Lesouhaitier O, Chevalier S, Jouenne T, Hardouin J. Impact of Carbon Source Supplementations on Pseudomonas aeruginosa Physiology. J Proteome Res 2022; 21:1392-1407. [PMID: 35482949 DOI: 10.1021/acs.jproteome.1c00936] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen highly resistant to a wide range of antimicrobial agents, making its infections very difficult to treat. Since microorganisms need to perpetually adapt to their surrounding environment, understanding the effect of carbon sources on P. aeruginosa physiology is therefore essential to avoid increasing drug-resistance and better fight this pathogen. By a global proteomic approach and phenotypic assays, we investigated the impact of various carbon source supplementations (glucose, glutamate, succinate, and citrate) on the physiology of the P. aeruginosa PA14 strain. A total of 581 proteins were identified as differentially expressed in the 4 conditions. Most of them were more abundant in citrate supplementation and were involved in virulence, motility, biofilm development, and antibiotic resistance. Phenotypic assays were performed to check these hypotheses. By coupling all this data, we highlight the importance of the environment in which the bacterium evolves on its metabolism, and thus the necessity to better understand the metabolic pathways implied in its adaptative response according to the nutrient availability.
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Affiliation(s)
- Salomé Sauvage
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France.,PISSARO Proteomic Facility, IRIB, 76820 Mont-Saint-Aignan, France
| | - Charlotte Gaviard
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France.,PISSARO Proteomic Facility, IRIB, 76820 Mont-Saint-Aignan, France
| | - Ali Tahrioui
- Laboratoire de microbiologie signaux et microenvironnement, LMSM EA4312, 55 rue Saint-Germain, 27000 Evreux, France
| | - Laurent Coquet
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France.,PISSARO Proteomic Facility, IRIB, 76820 Mont-Saint-Aignan, France
| | - Hung Le
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France
| | - Stéphane Alexandre
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France
| | - Ahmed Ben Abdelkrim
- Lactanet, Valacta, 555 Boul des Anciens-Combattants, Sainte-Anne-de-Bellevue, Québec H9X 3R4, Canada
| | - Emeline Bouffartigues
- Laboratoire de microbiologie signaux et microenvironnement, LMSM EA4312, 55 rue Saint-Germain, 27000 Evreux, France
| | - Olivier Lesouhaitier
- Laboratoire de microbiologie signaux et microenvironnement, LMSM EA4312, 55 rue Saint-Germain, 27000 Evreux, France
| | - Sylvie Chevalier
- Laboratoire de microbiologie signaux et microenvironnement, LMSM EA4312, 55 rue Saint-Germain, 27000 Evreux, France
| | - Thierry Jouenne
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France.,PISSARO Proteomic Facility, IRIB, 76820 Mont-Saint-Aignan, France
| | - Julie Hardouin
- Normandie Université, UNIROUEN, INSA, CNRS Polymers, Biopolymers, Surface Laboratory, 76821 Mont-Saint-Aignan cedex, France.,PISSARO Proteomic Facility, IRIB, 76820 Mont-Saint-Aignan, France
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7
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Marcos-Torres FJ, Moraleda-Muñoz A, Contreras-Moreno FJ, Muñoz-Dorado J, Pérez J. Mechanisms of Action of Non-Canonical ECF Sigma Factors. Int J Mol Sci 2022; 23:ijms23073601. [PMID: 35408957 PMCID: PMC8999054 DOI: 10.3390/ijms23073601] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 03/23/2022] [Accepted: 03/24/2022] [Indexed: 02/04/2023] Open
Abstract
Extracytoplasmic function (ECF) sigma factors are subunits of the RNA polymerase specialized in activating the transcription of a subset of genes responding to a specific environmental condition. The signal-transduction pathways where they participate can be activated by diverse mechanisms. The most common mechanism involves the action of a membrane-bound anti-sigma factor, which sequesters the ECF sigma factor, and releases it after the stimulus is sensed. However, despite most of these systems following this canonical regulation, there are many ECF sigma factors exhibiting a non-canonical regulatory mechanism. In this review, we aim to provide an updated and comprehensive view of the different activation mechanisms known for non-canonical ECF sigma factors, detailing their inclusion to the different phylogenetic groups and describing the mechanisms of regulation of some of their representative members such as EcfG from Rhodobacter sphaeroides, showing a partner-switch mechanism; EcfP from Vibrio parahaemolyticus, with a phosphorylation-dependent mechanism; or CorE from Myxococcus xanthus, regulated by a metal-sensing C-terminal extension.
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Affiliation(s)
| | - Aurelio Moraleda-Muñoz
- Departamento de Microbiología, Facultad de Ciencias, Universidad de Granada, Avda, Fuentenueva s/n, 18071 Granada, Spain; (F.J.C.-M.); (J.M.-D.)
- Correspondence: (A.M.-M.); (J.P.); Tel.: +34-95-824-2858 (A.M.-M.); +34-95-824-9830 (J.P.)
| | - Francisco Javier Contreras-Moreno
- Departamento de Microbiología, Facultad de Ciencias, Universidad de Granada, Avda, Fuentenueva s/n, 18071 Granada, Spain; (F.J.C.-M.); (J.M.-D.)
| | - José Muñoz-Dorado
- Departamento de Microbiología, Facultad de Ciencias, Universidad de Granada, Avda, Fuentenueva s/n, 18071 Granada, Spain; (F.J.C.-M.); (J.M.-D.)
| | - Juana Pérez
- Departamento de Microbiología, Facultad de Ciencias, Universidad de Granada, Avda, Fuentenueva s/n, 18071 Granada, Spain; (F.J.C.-M.); (J.M.-D.)
- Correspondence: (A.M.-M.); (J.P.); Tel.: +34-95-824-2858 (A.M.-M.); +34-95-824-9830 (J.P.)
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8
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Cell Envelope Stress Response in Pseudomonas aeruginosa. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1386:147-184. [DOI: 10.1007/978-3-031-08491-1_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Ramsay KA, McTavish SM, Wardell SJT, Lamont IL. The Effects of Sub-inhibitory Antibiotic Concentrations on Pseudomonas aeruginosa: Reduced Susceptibility Due to Mutations. Front Microbiol 2021; 12:789550. [PMID: 34987489 PMCID: PMC8721600 DOI: 10.3389/fmicb.2021.789550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 11/05/2021] [Indexed: 12/21/2022] Open
Abstract
Pseudomonas aeruginosa chronically infects in the lungs of people with cystic fibrosis and other forms of lung disease. Infections are treated with antibiotics, but over time, the bacteria acquire mutations that reduce their antibiotic susceptibility. The effects of inhibitory amounts of antibiotics in selecting for antibiotic-resistant mutants have been well studied. However, the concentrations of antibiotics that reach infecting bacteria can be sub-inhibitory and but may nonetheless promote emergence of antibiotic-resistant bacteria. Therefore, the aim of this research was to investigate the effects of sub-inhibitory concentrations of antibiotics on the antibiotic susceptibility of P. aeruginosa. Two P. aeruginosa reference strains, PAO1 and PA14, and six isolates from individuals with cystic fibrosis were studied. The bacteria were passaged in the presence of antibiotics (ceftazidime, ciprofloxacin, meropenem or tobramycin) at sub-inhibitory amounts. Fifteen populations of bacteria (up to five per strain) were exposed to each of the four antibiotics. Antibiotic susceptibility was determined following 10 passages on agar supplemented with antibiotic and compared with susceptibility prior to antibiotic exposure. Antibiotic exposure resulted in susceptibility being significantly (>2-fold) reduced for 13 of the 60 populations. Seven samples had reduced susceptibility to ciprofloxacin, three to tobramycin, two to ceftazidime and one to meropenem. Whole-genome sequencing revealed the mutations arising following antibiotic exposure. Mutants with reduced antibiotic susceptibility had mutations in genes known to affect antibiotic resistance, including regulators of efflux pumps (mexR, mexS, mexZ and nalC) and the fusA1 gene that is associated with aminoglycoside resistance. Genes not previously associated with resistance, including gacS, sigX and crfX and two genes with no known function, were also mutated in some isolates with reduced antibiotic susceptibility. Our results show that exposure to sub-inhibitory amounts of antibiotics can select for mutations that reduce the susceptibility of P. aeruginosa to antibiotics and that the profile of mutations is different from that arising during selection with inhibitory antibiotic concentrations. It is likely that exposure to sub-inhibitory amounts of antibiotics during infection contributes to P. aeruginosa becoming antibiotic-resistant.
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Affiliation(s)
| | | | | | - Iain L. Lamont
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
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10
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Brinkman FSL, Winsor GL, Done RE, Filloux A, Francis VI, Goldberg JB, Greenberg EP, Han K, Hancock REW, Haney CH, Häußler S, Klockgether J, Lamont IL, Levesque RC, Lory S, Nikel PI, Porter SL, Scurlock MW, Schweizer HP, Tümmler B, Wang M, Welch M. The Pseudomonas aeruginosa whole genome sequence: A 20th anniversary celebration. Adv Microb Physiol 2021; 79:25-88. [PMID: 34836612 DOI: 10.1016/bs.ampbs.2021.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Toward the end of August 2000, the 6.3 Mbp whole genome sequence of Pseudomonas aeruginosa strain PAO1 was published. With 5570 open reading frames (ORFs), PAO1 had the largest microbial genome sequenced up to that point in time-including a large proportion of metabolic, transport and antimicrobial resistance genes supporting its ability to colonize diverse environments. A remarkable 9% of its ORFs were predicted to encode proteins with regulatory functions, providing new insight into bacterial network complexity as a function of network size. In this celebratory article, we fast forward 20 years, and examine how access to this resource has transformed our understanding of P. aeruginosa. What follows is more than a simple review or commentary; we have specifically asked some of the leaders in the field to provide personal reflections on how the PAO1 genome sequence, along with the Pseudomonas Community Annotation Project (PseudoCAP) and Pseudomonas Genome Database (pseudomonas.com), have contributed to the many exciting discoveries in this field. In addition to bringing us all up to date with the latest developments, we also ask our contributors to speculate on how the next 20 years of Pseudomonas research might pan out.
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Affiliation(s)
- Fiona S L Brinkman
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada
| | - Geoffrey L Winsor
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada
| | - Rachel E Done
- Department of Pediatrics, Division of Pulmonary, Allergy and Immunology, Cystic Fibrosis, and Sleep, Emory Children's Center for Cystic Fibrosis and Airway Disease Research, Emory University School of Medicine, Atlanta, GA, United States
| | - Alain Filloux
- Department of Life Sciences, MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, United Kingdom
| | - Vanessa I Francis
- Geoffrey Pope Building, University of Exeter, Exeter, United Kingdom
| | - Joanna B Goldberg
- Department of Pediatrics, Division of Pulmonary, Allergy and Immunology, Cystic Fibrosis, and Sleep, Emory Children's Center for Cystic Fibrosis and Airway Disease Research, Emory University School of Medicine, Atlanta, GA, United States
| | - E Peter Greenberg
- Department of Microbiology, University of Washington, Seattle, WA, United States
| | - Kook Han
- Department of Microbiology, Harvard Medical School, Boston, MA, United States
| | | | - Cara H Haney
- Department of Microbiology and Immunology, The University of British Columbia, Vancouver, BC, Canada
| | - Susanne Häußler
- Department of Molecular Bacteriology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Jens Klockgether
- Klinik für Pädiatrische Pneumologie, Allergologie und Neonatologie, Medizinische Hochschule Hannover, Hannover, Germany
| | - Iain L Lamont
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
| | - Roger C Levesque
- Institut de biologie intégrative et des systèmes (IBIS), Pavillon Charles-Eugène Marchand, Faculté of Médicine, Université Laval, Québec City, QC, Canada
| | - Stephen Lory
- Department of Microbiology, Harvard Medical School, Boston, MA, United States
| | - Pablo I Nikel
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Lyngby, Denmark
| | - Steven L Porter
- Geoffrey Pope Building, University of Exeter, Exeter, United Kingdom
| | | | - Herbert P Schweizer
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, United States
| | - Burkhard Tümmler
- Klinik für Pädiatrische Pneumologie, Allergologie und Neonatologie, Medizinische Hochschule Hannover, Hannover, Germany
| | - Meng Wang
- Department of Biochemistry (Hopkins Building), University of Cambridge, Cambridge, United Kingdom
| | - Martin Welch
- Department of Biochemistry (Hopkins Building), University of Cambridge, Cambridge, United Kingdom.
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11
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Azuama OC, Ortiz S, Quirós-Guerrero L, Bouffartigues E, Tortuel D, Maillot O, Feuilloley M, Cornelis P, Lesouhaitier O, Grougnet R, Boutefnouchet S, Wolfender JL, Chevalier S, Tahrioui A. Tackling Pseudomonas aeruginosa Virulence by Mulinane-Like Diterpenoids from Azorella atacamensis. Biomolecules 2020; 10:biom10121626. [PMID: 33276611 PMCID: PMC7761567 DOI: 10.3390/biom10121626] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 11/30/2020] [Accepted: 11/30/2020] [Indexed: 12/28/2022] Open
Abstract
Pseudomonas aeruginosa is an important multidrug-resistant human pathogen by dint of its high intrinsic, acquired, and adaptive resistance mechanisms, causing great concern for immune-compromised individuals and public health. Additionally, P. aeruginosa resilience lies in the production of a myriad of virulence factors, which are known to be tightly regulated by the quorum sensing (QS) system. Anti-virulence therapy has been adopted as an innovative alternative approach to circumvent bacterial antibiotic resistance. Since plants are known repositories of natural phytochemicals, herein, we explored the anti-virulence potential of Azorella atacamensis, a medicinal plant from the Taira Atacama community (Calama, Chile), against P. aeruginosa. Interestingly, A. atacamensis extract (AaE) conferred a significant protection for human lung cells and Caenorhabditis elegans nematodes towards P. aeruginosa pathogenicity. The production of key virulence factors was decreased upon AaE exposure without affecting P. aeruginosa growth. In addition, AaE was able to decrease QS-molecules production. Furthermore, metabolite profiling of AaE and its derived fractions achieved by combination of a molecular network and in silico annotation allowed the putative identification of fourteen diterpenoids bearing a mulinane-like skeleton. Remarkably, this unique interesting group of diterpenoids seems to be responsible for the interference with virulence factors as well as on the perturbation of membrane homeostasis of P. aeruginosa. Hence, there was a significant increase in membrane stiffness, which appears to be modulated by the cell wall stress response ECFσ SigX, an extracytoplasmic function sigma factor involved in membrane homeostasis as well as P. aeruginosa virulence.
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Affiliation(s)
- Onyedikachi Cecil Azuama
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
- Department of Biological Sciences, Alex-Ekwueme Federal University, Ndufu Alike Ikwo PMB1010, Nigeria
| | - Sergio Ortiz
- Équipe Produits Naturels, Analyses et Synthèses (PNAS), CiTCoM UMR 8038 CNRS, Faculté de Pharmacie, Université de Paris, 75006 Paris, France; (S.O.); (R.G.); (S.B.)
| | - Luis Quirós-Guerrero
- Phytochemistry and Bioactive Natural Products, School of Pharmaceutical Science, University of Geneva, 1211 Geneva, Switzerland; (L.Q.-G.); (J.-L.W.)
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSW), University of Geneva, CMU, 1211 Geneva, Switzerland
| | - Emeline Bouffartigues
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Damien Tortuel
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Olivier Maillot
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Marc Feuilloley
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Pierre Cornelis
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Olivier Lesouhaitier
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Raphaël Grougnet
- Équipe Produits Naturels, Analyses et Synthèses (PNAS), CiTCoM UMR 8038 CNRS, Faculté de Pharmacie, Université de Paris, 75006 Paris, France; (S.O.); (R.G.); (S.B.)
| | - Sabrina Boutefnouchet
- Équipe Produits Naturels, Analyses et Synthèses (PNAS), CiTCoM UMR 8038 CNRS, Faculté de Pharmacie, Université de Paris, 75006 Paris, France; (S.O.); (R.G.); (S.B.)
| | - Jean-Luc Wolfender
- Phytochemistry and Bioactive Natural Products, School of Pharmaceutical Science, University of Geneva, 1211 Geneva, Switzerland; (L.Q.-G.); (J.-L.W.)
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSW), University of Geneva, CMU, 1211 Geneva, Switzerland
| | - Sylvie Chevalier
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
| | - Ali Tahrioui
- Laboratoire de Microbiologie Signaux et Microenvironnement, Normandie Université, Université de Rouen Normandie, LMSM EA4312, 27000 Évreux, France; (O.C.A.); (E.B.); (D.T.); (O.M.); (M.F.); (P.C.); (O.L.); (S.C.)
- Fédération de Recherche Sécurité Sanitaire, Bien-Être, Aliments Durables (SéSAD), Normandie Université, Université de Rouen Normandie, 27000 Évreux, France
- Correspondence: ; Tel.: +33-232291560; Fax: +33-232291550
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12
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Activation of the Cell Wall Stress Response in Pseudomonas aeruginosa Infected by a Pf4 Phage Variant. Microorganisms 2020; 8:microorganisms8111700. [PMID: 33143386 PMCID: PMC7693463 DOI: 10.3390/microorganisms8111700] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 10/28/2020] [Accepted: 10/29/2020] [Indexed: 12/21/2022] Open
Abstract
Pseudomonas aeruginosa PAO1 has an integrated Pf4 prophage in its genome, encoding a relatively well-characterized filamentous phage, which contributes to the bacterial biofilm organization and maturation. Pf4 variants are considered as superinfectives when they can re-infect and kill the prophage-carrying host. Herein, the response of P. aeruginosa H103 to Pf4 variant infection was investigated. This phage variant caused partial lysis of the bacterial population and modulated H103 physiology. We show by confocal laser scanning microscopy that a Pf4 variant-infection altered P. aeruginosa H103 biofilm architecture either in static or dynamic conditions. Interestingly, in the latter condition, numerous cells displayed a filamentous morphology, suggesting a link between this phenotype and flow-related forces. In addition, Pf4 variant-infection resulted in cell envelope stress response, mostly mediated by the AlgU and SigX extracytoplasmic function sigma factors (ECFσ). AlgU and SigX involvement may account, at least partly, for the enhanced expression level of genes involved in the biosynthesis pathways of two matrix exopolysaccharides (Pel and alginates) and bis-(3′-5′)-cyclic dimeric guanosine monophosphate (c-di-GMP) metabolism.
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