1
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Dangla-Pélissier G, Roux N, Schmidt V, Chambonnier G, Ba M, Sebban-Kreuzer C, de Bentzmann S, Giraud C, Bordi C. The horizontal transfer of Pseudomonas aeruginosa PA14 ICE PAPI-1 is controlled by a transcriptional triad between TprA, NdpA2 and MvaT. Nucleic Acids Res 2021; 49:10956-10974. [PMID: 34643711 PMCID: PMC8565334 DOI: 10.1093/nar/gkab827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/24/2021] [Accepted: 10/06/2021] [Indexed: 01/16/2023] Open
Abstract
Pseudomonas aeruginosa is a major cause of nosocomial infections, particularly in immunocompromised patients or in individuals with cystic fibrosis. Genome sequences reveal that most P. aeruginosa strains contain a significant number of accessory genes gathered in genomic islands. Those genes are essential for P. aeruginosa to invade new ecological niches with high levels of antibiotic usage, like hospitals, or to survive during host infection by providing pathogenicity determinants. P. aeruginosa pathogenicity island 1 (PAPI-1), one of the largest genomic islands, encodes several putative virulence factors, including toxins, biofilm genes and antibiotic-resistance traits. The integrative and conjugative element (ICE) PAPI-1 is horizontally transferable by conjugation via a specialized GI-T4SS, but the mechanism regulating this transfer is currently unknown. Here, we show that this GI-T4SS conjugative machinery is directly induced by TprA, a regulator encoded within PAPI-1. Our data indicate that the nucleotide associated protein NdpA2 acts in synergy with TprA, removing a repressive mechanism exerted by MvaT. In addition, using a transcriptomic approach, we unravelled the regulon controlled by Ndpa2/TprA and showed that they act as major regulators on the genes belonging to PAPI-1. Moreover, TprA and NdpA2 trigger an atypical biofilm structure and enhance ICE PAPI-1 transfer.
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Affiliation(s)
| | - Nicolas Roux
- LISM, IMM, Aix-Marseille University, Marseille 13402, France
| | | | | | - Moly Ba
- LISM, IMM, Aix-Marseille University, Marseille 13402, France
| | | | | | - Caroline Giraud
- U2RM Stress/Virulence, Normandy University, UNICAEN, 14000 Caen, France
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2
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Vacchini M, Edwards R, Guizzardi R, Palmioli A, Ciaramelli C, Paiotta A, Airoldi C, La Ferla B, Cipolla L. Glycan Carriers As Glycotools for Medicinal Chemistry Applications. Curr Med Chem 2019; 26:6349-6398. [DOI: 10.2174/0929867326666190104164653] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 11/07/2018] [Accepted: 12/18/2018] [Indexed: 12/12/2022]
Abstract
Carbohydrates are one of the most powerful and versatile classes of biomolecules that nature
uses to regulate organisms’ biochemistry, modulating plenty of signaling events within cells, triggering
a plethora of physiological and pathological cellular behaviors. In this framework, glycan carrier
systems or carbohydrate-decorated materials constitute interesting and relevant tools for medicinal
chemistry applications. In the last few decades, efforts have been focused, among others, on the development
of multivalent glycoconjugates, biosensors, glycoarrays, carbohydrate-decorated biomaterials
for regenerative medicine, and glyconanoparticles. This review aims to provide the reader with a general
overview of the different carbohydrate carrier systems that have been developed as tools in different
medicinal chemistry approaches relying on carbohydrate-protein interactions. Given the extent of
this topic, the present review will focus on selected examples that highlight the advancements and potentialities
offered by this specific area of research, rather than being an exhaustive literature survey of
any specific glyco-functionalized system.
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Affiliation(s)
- Mattia Vacchini
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Rana Edwards
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Roberto Guizzardi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Alessandro Palmioli
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Carlotta Ciaramelli
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Alice Paiotta
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Cristina Airoldi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Barbara La Ferla
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
| | - Laura Cipolla
- Department of Biotechnology and Biosciences, University of Milano-Bicocca Milano, Italy
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3
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Yu G, Thies‐Weesie DME, Pieters RJ. TetravalentPseudomonas aeruginosaAdhesion Lectin LecA Inhibitor for Enhanced Biofilm Inhibition. Helv Chim Acta 2019. [DOI: 10.1002/hlca.201900014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Guangyun Yu
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical SciencesUtrecht University P.O.Box 80082 NL-3508 TB Utrecht The Netherlands
| | - Dominique M. E. Thies‐Weesie
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials ScienceUtrecht University Padualaan 8 NL-3584 CH Utrecht The Netherlands
| | - Roland J. Pieters
- Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical SciencesUtrecht University P.O.Box 80082 NL-3508 TB Utrecht The Netherlands
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4
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Zhang W, Sun J, Ding W, Lin J, Tian R, Lu L, Liu X, Shen X, Qian PY. Extracellular matrix-associated proteins form an integral and dynamic system during Pseudomonas aeruginosa biofilm development. Front Cell Infect Microbiol 2015; 5:40. [PMID: 26029669 PMCID: PMC4429628 DOI: 10.3389/fcimb.2015.00040] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 04/27/2015] [Indexed: 12/13/2022] Open
Abstract
Though the essential role of extracellular matrix in biofilm development has been extensively documented, the function of matrix-associated proteins is elusive. Determining the dynamics of matrix-associated proteins would be a useful way to reveal their functions in biofilm development. Therefore, we applied iTRAQ-based quantitative proteomics to evaluate matrix-associated proteins isolated from different phases of Pseudomonas aeruginosa ATCC27853 biofilms. Among the identified 389 proteins, 54 changed their abundance significantly. The increased abundance of stress resistance and nutrient metabolism-related proteins over the period of biofilm development was consistent with the hypothesis that biofilm matrix forms micro-environments in which cells are optimally organized to resist stress and use available nutrients. Secreted proteins, including novel putative effectors of the type III secretion system were identified, suggesting that the dynamics of pathogenesis-related proteins in the matrix are associated with biofilm development. Interestingly, there was a good correlation between the abundance changes of matrix-associated proteins and their expression. Further analysis revealed complex interactions among these modulated proteins, and the mutation of selected proteins attenuated biofilm development. Collectively, this work presents the first dynamic picture of matrix-associated proteins during biofilm development, and provides evidences that the matrix-associated proteins may form an integral and well regulated system that contributes to stress resistance, nutrient acquisition, pathogenesis and the stability of the biofilm.
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Affiliation(s)
- Weipeng Zhang
- Division of Life Science, The Hong Kong University of Science and Technology Hong Kong, China
| | - Jin Sun
- Department of Biology, Hong Kong Baptist University Hong Kong, China
| | - Wei Ding
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A & F University Yangling, China
| | - Jinshui Lin
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A & F University Yangling, China
| | - Renmao Tian
- Division of Life Science, The Hong Kong University of Science and Technology Hong Kong, China
| | - Liang Lu
- Division of Life Science, The Hong Kong University of Science and Technology Hong Kong, China
| | - Xiaofen Liu
- Division of Life Science, The Hong Kong University of Science and Technology Hong Kong, China
| | - Xihui Shen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A & F University Yangling, China
| | - Pei-Yuan Qian
- Division of Life Science, The Hong Kong University of Science and Technology Hong Kong, China
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5
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Papaphilippou PC, Vyrides I, Mpekris F, Stylianopoulos T, Papatryfonos CA, Theocharis CR, Krasia-Christoforou T. Evaluation of novel, cationic electrospun microfibrous membranes as adsorbents in bacteria removal. RSC Adv 2015. [DOI: 10.1039/c5ra11406c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cationic, methacrylate-based electrospun microfibrous membranes have been evaluated as adsorbents for the removal of Gram-negative bacteria namely Pseudomonas aeruginosa and Advenella species from synthetic aqueous media and urban wastewater.
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Affiliation(s)
- Petri Ch. Papaphilippou
- Polymers Laboratory
- Department of Mechanical and Manufacturing Engineering
- University of Cyprus
- Nicosia
- Cyprus
| | - Ioannis Vyrides
- Department of Environmental Science and Technology
- Cyprus University of Technology
- Limassol
- Cyprus
| | - Fotios Mpekris
- Cancer Biophysics Laboratory
- Department of Mechanical and Manufacturing Engineering
- University of Cyprus
- Nicosia
- Cyprus
| | - Triantafyllos Stylianopoulos
- Cancer Biophysics Laboratory
- Department of Mechanical and Manufacturing Engineering
- University of Cyprus
- Nicosia
- Cyprus
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Cecioni S, Imberty A, Vidal S. Glycomimetics versus Multivalent Glycoconjugates for the Design of High Affinity Lectin Ligands. Chem Rev 2014; 115:525-61. [DOI: 10.1021/cr500303t] [Citation(s) in RCA: 381] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Samy Cecioni
- CERMAV, Université Grenoble Alpes and CNRS, BP 53, F-38041 Grenoble Cedex 9, France
- Institut
de Chimie et Biochimie Moléculaires et Supramoléculaires,
Laboratoire de Chimie Organique 2 - Glycochimie, UMR 5246, Université Lyon 1 and CNRS, 43 Boulevard du 11 Novembre 1918, F-69622, Villeurbanne, France
| | - Anne Imberty
- CERMAV, Université Grenoble Alpes and CNRS, BP 53, F-38041 Grenoble Cedex 9, France
| | - Sébastien Vidal
- Institut
de Chimie et Biochimie Moléculaires et Supramoléculaires,
Laboratoire de Chimie Organique 2 - Glycochimie, UMR 5246, Université Lyon 1 and CNRS, 43 Boulevard du 11 Novembre 1918, F-69622, Villeurbanne, France
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Neznansky A, Opatowsky Y. Expression, purification and crystallization of the phosphate-binding PstS protein from Pseudomonas aeruginosa. Acta Crystallogr F Struct Biol Commun 2014; 70:906-10. [PMID: 25005086 PMCID: PMC4089529 DOI: 10.1107/s2053230x14010279] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Accepted: 05/06/2014] [Indexed: 11/10/2022] Open
Abstract
Pseudomonas aeruginosa (PA) infections pose a serious threat to human health. PA is a leading cause of fatal lung infections in cystic fibrosis and immune-suppressed patients, of sepsis in burn victims and of nosocomial infections. An important element in PA virulence is its ability to establish biofilms that evade suppression by the host's immune system and antibiotics. PstS, a periplasmic subunit of the Pst phosphate-transport system of PA, plays a critical role in the establishment of biofilms. In some drug-resistant PA strains, PstS is secreted in large quantities from the bacteria, where it participates in the assembly of adhesion fibres that enhance bacterial virulence. In order to understand the dual function of PstS in biofilm formation and phosphate transport, the crystal structure of PA PstS was determined. Here, the overexpression in Escherichia coli and purification of PA PstS in the presence of phosphate are described. Two crystal forms were obtained using the vapour-diffusion method at 20°C and X-ray diffraction data were collected. The first crystal form belonged to the centred orthorhombic space group C222₁, with unit-cell parameters a=67.5, b=151.3, c=108.9 Å. Assuming the presence of a dimer in the asymmetric unit gives a crystal volume per protein weight (VM) of 2.09 Å3 Da(-1) and a solvent content of 41%. The second crystal form belonged to the primitive orthorhombic space group P2₁2₁2₁, with unit-cell parameters a=35.4, b=148.3, c=216.7 Å. Assuming the presence of a tetramer in the asymmetric unit gives a crystal volume per protein weight (VM) of 2.14 Å3 Da(-1) and a solvent content of 42.65%. A pseudo-translational symmetry is present in the P212121 crystal form which is consistent with a filamentous arrangement of PstS in the crystal lattice.
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Affiliation(s)
- Avi Neznansky
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Yarden Opatowsky
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
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8
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Sall KM, Casabona MG, Bordi C, Huber P, de Bentzmann S, Attrée I, Elsen S. A gacS deletion in Pseudomonas aeruginosa cystic fibrosis isolate CHA shapes its virulence. PLoS One 2014; 9:e95936. [PMID: 24780952 PMCID: PMC4004566 DOI: 10.1371/journal.pone.0095936] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Accepted: 03/30/2014] [Indexed: 11/21/2022] Open
Abstract
Pseudomonas aeruginosa, a human opportunistic pathogen, is capable of provoking acute and chronic infections that are associated with defined sets of virulence factors. During chronic infections, the bacterium accumulates mutations that silence some and activate other genes. Here we show that the cystic fibrosis isolate CHA exhibits a unique virulence phenotype featuring a mucoid morphology, an active Type III Secretion System (T3SS, hallmark of acute infections), and no Type VI Secretion System (H1-T6SS). This virulence profile is due to a 426 bp deletion in the 3′ end of the gacS gene encoding an essential regulatory protein. The absence of GacS disturbs the Gac/Rsm pathway leading to depletion of the small regulatory RNAs RsmY/RsmZ and, in consequence, to expression of T3SS, while switching off the expression of H1-T6SS and Pel polysaccharides. The CHA isolate also exhibits full ability to swim and twitch, due to active flagellum and Type IVa pili. Thus, unlike the classical scheme of balance between virulence factors, clinical strains may adapt to a local niche by expressing both alginate exopolysaccharide, a hallmark of membrane stress that protects from antibiotic action, host defences and phagocytosis, and efficient T3S machinery that is considered as an aggressive virulence factor.
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Affiliation(s)
- Khady Mayebine Sall
- INSERM, UMR-S 1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- UJF-Grenoble 1, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Maria Guillermina Casabona
- INSERM, UMR-S 1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- UJF-Grenoble 1, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Christophe Bordi
- Laboratoire d’Ingénierie des Systèmes Macromoléculaires, UMR 7255 CNRS - Aix Marseille University, Marseille, France
| | - Philippe Huber
- INSERM, UMR-S 1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- UJF-Grenoble 1, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Sophie de Bentzmann
- Laboratoire d’Ingénierie des Systèmes Macromoléculaires, UMR 7255 CNRS - Aix Marseille University, Marseille, France
| | - Ina Attrée
- INSERM, UMR-S 1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- UJF-Grenoble 1, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
| | - Sylvie Elsen
- INSERM, UMR-S 1036, Biology of Cancer and Infection, Grenoble, France
- CNRS, ERL 5261, Bacterial Pathogenesis and Cellular Responses, Grenoble, France
- UJF-Grenoble 1, Grenoble, France
- CEA, DSV/iRTSV, Grenoble, France
- * E-mail:
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9
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Vanysacker L, Declerck P, Bilad M, Vankelecom I. Biofouling on microfiltration membranes in MBRs: Role of membrane type and microbial community. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2013.11.024] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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10
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Abstract
Protein-carbohydrate interactions are often involved in the first step of infection and Pseudomonas aeruginosa produces several proteins that are able to bind specifically to glycan epitopes present on host epithelia. The experimental approaches for studying protein-carbohydrate interaction have been inspired, with some adaptations, from those commonly used for protein-protein or protein-ligand interactions. A range of methods are described herein for detecting lectin activity, screening for monosaccharide or oligosaccharide specificity, determining the affinity of binding together with thermodynamics and kinetics parameters, and producing crystal of lectin-carbohydrate complexes for further structural studies.
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Affiliation(s)
- Sophie de Bentzmann
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires (LISM), UMR7255 CNRS-Aix Marseille Université, Institut de Microbiologie de la Méditerranée, 31 Chemin Joseph Aiguier, Marseille Cédex 20, 13402, France,
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11
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Beaufort N, Corvazier E, Mlanaoindrou S, de Bentzmann S, Pidard D. Disruption of the endothelial barrier by proteases from the bacterial pathogen Pseudomonas aeruginosa: implication of matrilysis and receptor cleavage. PLoS One 2013; 8:e75708. [PMID: 24069438 PMCID: PMC3777978 DOI: 10.1371/journal.pone.0075708] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 08/19/2013] [Indexed: 12/19/2022] Open
Abstract
Within the vasculature, uncontrolled pericellular proteolysis can lead to disruption of cell-to-cell and cell-to-matrix interactions and subsequent detachment-induced cell apoptosis, or anoikis, contributing to inflammatory vascular diseases, with the endothelium as the major target. Most studies so far have focused on endogenous proteinases. However, during bloodstream infections, bacterial proteinases may also trigger endothelial anoikis. We thus investigated the potential apoptotic activity of the proteinases secreted by the haematotropic opportunistic pathogen, Pseudomonas aeruginosa, and particularly its predominant metalloproteinase, LasB. For this, we used the secretome of the LasB-expressing pseudomonal strain, PAO1, and compared it with that from the isogenic, LasB-deficient strain (PAO1∆lasB), as well as with purified LasB. Secretomes were tested for apoptotic activity on cultured human endothelial cells derived from the umbilical vein or from the cerebral microvasculature. We found that the PAO1 secretome readily induced endothelial cell anoikis, as did secretomes of LasB-positive clinical pseudomonal isolates, while the PAO1∆lasB secretome had only a limited impact on endothelial adherence and viability. Notably, purified LasB reproduced most of the effects of the LasB-containing secretomes, and these were drastically reduced in the presence of the LasB-selective inhibitor, phosphoramidon. A precocious and extensive LasB-dependent degradation of several proteins associated with the endothelial extracellular matrix, fibronectin and von Willebrand factor, was observed by immunofluorescence and/or immunoblotting analysis of cell cultures. Moreover, the PAO1 secretome, but not that from PAO1∆lasB, specifically induced rapid endoproteolysis of two major interendothelial junction components, VE-cadherin and occludin, as well as of the anti-anoikis, integrin-associated urokinase receptor, uPAR. Taken as a prototype for exogenous haemorrhagic proteinases, pseudomonal LasB thus appears to induce endothelial anoikis not only via matrilysis, as observed for many pro-apoptotic proteinases, but also via cleavage of some essential cell-to-cell and cell-to-matrix adhesion receptors implicated in the maintenance of the endothelial barrier.
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Affiliation(s)
- Nathalie Beaufort
- Inserm, U698, Paris, France
- Université Denis Diderot, UMR-S698, Paris, France
| | - Elisabeth Corvazier
- Inserm, U698, Paris, France
- Université Denis Diderot, UMR-S698, Paris, France
| | - Saouda Mlanaoindrou
- Inserm, U698, Paris, France
- Université Denis Diderot, UMR-S698, Paris, France
| | - Sophie de Bentzmann
- CNRS, UMR 7255-LISM, Marseille, France
- Aix-Marseille University, Marseille, France
| | - Dominique Pidard
- Inserm, U698, Paris, France
- Université Denis Diderot, UMR-S698, Paris, France
- * E-mail:
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12
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Unique biofilm signature, drug susceptibility and decreased virulence in Drosophila through the Pseudomonas aeruginosa two-component system PprAB. PLoS Pathog 2012; 8:e1003052. [PMID: 23209420 PMCID: PMC3510237 DOI: 10.1371/journal.ppat.1003052] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Accepted: 09/09/2012] [Indexed: 12/29/2022] Open
Abstract
Bacterial biofilm is considered as a particular lifestyle helping cells to survive hostile environments triggered by a variety of signals sensed and integrated through adequate regulatory pathways. Pseudomonas aeruginosa, a Gram-negative bacterium causing severe infections in humans, forms biofilms and is a fantastic example for fine-tuning of the transition between planktonic and community lifestyles through two-component systems (TCS). Here we decipher the regulon of the P. aeruginosa response regulator PprB of the TCS PprAB. We identified genes under the control of this TCS and once this pathway is activated, analyzed and dissected at the molecular level the PprB-dependent phenotypes in various models. The TCS PprAB triggers a hyper-biofilm phenotype with a unique adhesive signature made of BapA adhesin, a Type 1 secretion system (T1SS) substrate, CupE CU fimbriae, Flp Type IVb pili and eDNA without EPS involvement. This unique signature is associated with drug hyper-susceptibility, decreased virulence in acutely infected flies and cytotoxicity toward various cell types linked to decreased Type III secretion (T3SS). Moreover, once the PprB pathway is activated, decreased virulence in orally infected flies associated with enhanced biofilm formation and dissemination defect from the intestinal lumen toward the hemolymph compartment is reported. PprB may thus represent a key bacterial adaptation checkpoint of multicellular and aggregative behavior triggering the production of a unique matrix associated with peculiar antibiotic susceptibility and attenuated virulence, a particular interesting breach for therapeutic intervention to consider in view of possible eradication of P. aeruginosa biofilm-associated infections.
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13
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Roux N, Spagnolo J, de Bentzmann S. Neglected but amazingly diverse type IVb pili. Res Microbiol 2012; 163:659-73. [PMID: 23103334 DOI: 10.1016/j.resmic.2012.10.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 10/19/2012] [Indexed: 01/12/2023]
Abstract
This review provides an overview of current knowledge concerning type IVb pili in Gram-negative bacteria. The number of these pili identified is steadily increasing with genome sequencing and mining studies, but studies of these pili are somewhat uneven, because their expression is tightly regulated and the signals or regulators controlling expression need to be identified. However, as illustrated here, they have a number of interesting functional, assembly-related and regulatory features.
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Affiliation(s)
- Nicolas Roux
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires, CNRS UMR7255 - Aix Marseille University, Institut de Microbiologie de la Méditerranée, 31 Chemin Joseph Aiguier, 13402, cédex 20, Marseille, France
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14
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Kim HW, Oh HS, Kim SR, Lee KB, Yeon KM, Lee CH, Kim S, Lee JK. Microbial population dynamics and proteomics in membrane bioreactors with enzymatic quorum quenching. Appl Microbiol Biotechnol 2012; 97:4665-75. [PMID: 22846900 DOI: 10.1007/s00253-012-4272-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 06/27/2012] [Accepted: 06/28/2012] [Indexed: 11/24/2022]
Abstract
Quorum sensing gives rise to biofilm formation on the membrane surface, which in turn causes a loss of water permeability in membrane bioreactors (MBRs) for wastewater treatment. Enzymatic quorum quenching was reported to successfully inhibit the formation of biofilm in MBRs through the decomposition of signal molecules, N-acyl homoserine lactones (AHLs). The aim of this study was to elucidate the mechanisms of quorum quenching in more detail in terms of microbial population dynamics and proteomics. Microbial communities in MBRs with and without a quorum quenching enzyme (acylase) were analyzed using pyrosequencing and compared with each other. In the quorum quenching MBR, the rate of transmembrane pressure (TMP) rise-up was delayed substantially, and the proportion of quorum sensing bacteria with AHL-like autoinducers (such as Enterobacter, Pseudomonas, and Acinetobacter) also decreased in the entire microbial community of mature biofilm in comparison to that in the control MBR. These factors were attributed to the lower production of extracellular polymeric substances (EPS), which are known to play a key role in the formation of biofilm. Proteomic analysis using the Enterobacter cancerogenus strain ATCC 35316 demonstrates the possible depression of protein expression related to microbial attachments to solid surfaces (outer membrane protein, flagellin) and the agglomeration of microorganisms (ATP synthase beta subunit) with the enzymatic quorum quenching. It has been argued that changes in the microbial population, EPS and proteins via enzymatic quorum quenching could inhibit the formation of biofilm, resulting in less biofouling in the quorum quenching MBR.
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Affiliation(s)
- Hak-Woo Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea
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15
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Duque E, de la Torre J, Bernal P, Molina-Henares MA, Alaminos M, Espinosa-Urgel M, Roca A, Fernández M, de Bentzmann S, Ramos JL. Identification of reciprocal adhesion genes in pathogenic and non-pathogenicPseudomonas. Environ Microbiol 2012; 15:36-48. [DOI: 10.1111/j.1462-2920.2012.02732.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Giraud C, de Bentzmann S. Inside the complex regulation of Pseudomonas aeruginosa chaperone usher systems. Environ Microbiol 2011; 14:1805-16. [PMID: 22187957 DOI: 10.1111/j.1462-2920.2011.02673.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Pseudomonas aeruginosa assembles several cell surface-associated organelles, including those of the chaperone usher (CU) pathway. Five different CU loci have been identified and characterized in various strains of P.aeruginosa. However, their potential functional redundancy, particularly in biofilm formation, is supported by the control of their expression by a complex and specific regulatory network. Here, we review recent findings relating to this network. The control exerted by this network involves transcriptional repressors and activators, a phase-variable mechanism, a second intracellular messenger (c-di-GMP) and chemosensory and two-component systems.
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Affiliation(s)
- Caroline Giraud
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires, CNRS - Aix Marseille Université, 31 Chemin Joseph Aiguier, 13402 Marseille, France
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Bordi C, de Bentzmann S. Hacking into bacterial biofilms: a new therapeutic challenge. Ann Intensive Care 2011; 1:19. [PMID: 21906350 PMCID: PMC3224501 DOI: 10.1186/2110-5820-1-19] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Accepted: 06/13/2011] [Indexed: 02/07/2023] Open
Abstract
Microbiologists have extensively worked during the past decade on a particular phase of the bacterial cell cycle known as biofilm, in which single-celled individuals gather together to form a sedentary but dynamic community within a complex structure, displaying spatial and functional heterogeneity. In response to the perception of environmental signals by sensing systems, appropriate responses are triggered, leading to biofilm formation. This process involves various molecular systems that enable bacteria to identify appropriate surfaces on which to anchor themselves, to stick to those surfaces and to each other, to construct multicellular communities several hundreds of micrometers thick, and to detach from the community. The biofilm microbial community is a unique, highly competitive, and crowded environment facilitating microevolutionary processes and horizontal gene transfer between distantly related microorganisms. It is governed by social rules, based on the production and use of "public" goods, with actors and recipients. Biofilms constitute a unique shield against external aggressions, including drug treatment and immune reactions. Biofilm-associated infections in humans have therefore generated major problems for the diagnosis and treatment of diseases. Improvements in our understanding of biofilms have led to innovative research designed to interfere with this process.
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Affiliation(s)
- Christophe Bordi
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires, UPR9027 CNRS - Aix Marseille Université, Institut de Microbiologie de la Méditerranée, 31 Chemin Joseph Aiguier, 13402 Marseille, France.
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de Bentzmann S, Plésiat P. The Pseudomonas aeruginosa opportunistic pathogen and human infections. Environ Microbiol 2011; 13:1655-65. [PMID: 21450006 DOI: 10.1111/j.1462-2920.2011.02469.x] [Citation(s) in RCA: 181] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Pseudomonas aeruginosa, a Gram-negative environmental species and an opportunistic microorganism, establishes itself in vulnerable patients, such as those with cystic fibrosis or hospitalized in intensive care units. It has become a major cause of nosocomial infections worldwide (about 10% of all such infections in most European Union hospitals) and a serious threat to Public Health. The overuse and misuse of antibiotics have also led to the selection of resistant strains against which very few therapeutic options exist. How an environmental species can cause human infections remains a key question that still needs elucidation despite the incredibly high progress that has been made in the P. aeruginosa biology over the past decades. The workshop belonging to Current trends in Biomedicine series, which was held under the sponsorship of the Universidad International de Andalucia between the 8th and the 10th November 2010 brought in the most recent advances in the environmental life of P. aeruginosa, the human P. aeruginosa infections, the new animal models to study Pseudomonas infections, the new genetic aspects including metabolomics, genomics and bioinformatics and the community lifestyle named biofilm that accounts for P. aeruginosa persistence in humans. This workshop organized by Soeren Molin (Danemark), Juan-Luis Ramos (Spain) and Sophie de Bentzmann (France) gathered 46 researchers coming from 11 European and American countries in a small format and was hosted in the 'Sede Antonio Machado' in Baeza. It was organized in seven sessions covering animal models for P. aeruginosa pathogenesis, resistance to drugs, regulatory potency including small RNA, two component systems, extracytoplasmic function sigma factors and trancriptional regulators, new therapies emerging from dissection of molecular mechanisms, and evolutionary mechanisms of P. aeruginosa strains in patients.
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Affiliation(s)
- Sophie de Bentzmann
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires, CNRS - Aix Marseille Université, 31 Chemin Joseph Aiguier, 13402 Marseille, France.
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Giraud C, Bernard CS, Calderon V, Yang L, Filloux A, Molin S, Fichant G, Bordi C, de Bentzmann S. The PprA-PprB two-component system activates CupE, the first non-archetypal Pseudomonas aeruginosa chaperone-usher pathway system assembling fimbriae. Environ Microbiol 2010; 13:666-83. [DOI: 10.1111/j.1462-2920.2010.02372.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Rodríguez-Herva JJ, Duque E, Molina-Henares MA, Navarro-Avilés G, Van Dillewijn P, De La Torre J, Molina-Henares AJ, La Campa ASD, Ran FA, Segura A, Shingler V, Ramos JL. Physiological and transcriptomic characterization of a fliA mutant of Pseudomonas putida KT2440. ENVIRONMENTAL MICROBIOLOGY REPORTS 2010; 2:373-380. [PMID: 23766109 DOI: 10.1111/j.1758-2229.2009.00084.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Pseudomonas putida KT2440 encodes 23 alternative sigma factors. The fliA gene, which encodes σ(28) , is in a cluster with other genes involved in flagella biosynthesis and chemotaxis. Reverse transcriptase-PCR revealed that this cluster is comprised of four independent transcriptional units: flhAF, fleNfliA, cheYZA and cheBmotAB. We generated a nonpolar fliA mutant by homologous recombination and tested its motility, adhesion to biotic and abiotic surfaces, and responses to various stress conditions. The mutant strain was nonmotile and exhibited decreased capacity to bind to corn seeds, although its ability to colonize the rhizosphere of plants was unaffected. The mutant was also affected in binding to abiotic surfaces and its ability to form biofilms decreased by almost threefold. In the fliA mutant background expression of 25 genes was affected: two genes were upregulated and 23 genes were downregulated. In addition to a number of motility and chemotaxis genes, the fliA gene product is also necessary for the expression of some genes potentially involved in amino acid utilization or stress responses; however, we were unable to assign specific phenotypes linked to these genes since the fliA mutant used the same range of amino acids as the parental strain, and was as tolerant as the wild type to stress imposed by heat, antibiotics, NaCl, sodium dodecyl sulfate, H2 O2 and benzoate. Based on the sequence alignment of promoters recognized by FliA and genome in silico analysis, we propose that P. putidaσ(28) recognizes a TCAAG-t-N12 -GCCGATA consensus sequence located between -34 and -8 and that this sequence is preferentially associated with an AT-rich upstream region.
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Affiliation(s)
- José Juan Rodríguez-Herva
- Department of Environmental Protection, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, E-18008 Granada, Spain. Department of Molecular Biology, Umeå University, S-901 87 Umeå, Sweden. Unidad Asociada de Contaminación Atmosférica, CSIC-Universidad de Huelva, Huelva, Spain
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