1
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Chance DL, Wang W, Waters JK, Mawhinney TP. Insights on Pseudomonas aeruginosa Carbohydrate Binding from Profiles of Cystic Fibrosis Isolates Using Multivalent Fluorescent Glycopolymers Bearing Pendant Monosaccharides. Microorganisms 2024; 12:801. [PMID: 38674745 PMCID: PMC11051836 DOI: 10.3390/microorganisms12040801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/07/2024] [Accepted: 04/08/2024] [Indexed: 04/28/2024] Open
Abstract
Pseudomonas aeruginosa contributes to frequent, persistent, and, often, polymicrobial respiratory tract infections for individuals with cystic fibrosis (CF). Chronic CF infections lead to bronchiectasis and a shortened lifespan. P. aeruginosa expresses numerous adhesins, including lectins known to bind the epithelial cell and mucin glycoconjugates. Blocking carbohydrate-mediated host-pathogen and intra-biofilm interactions critical to the initiation and perpetuation of colonization offer promise as anti-infective treatment strategies. To inform anti-adhesion therapies, we profiled the monosaccharide binding of P. aeruginosa from CF and non-CF sources, and assessed whether specific bacterial phenotypic characteristics affected carbohydrate-binding patterns. Focusing at the cellular level, microscopic and spectrofluorometric tools permitted the solution-phase analysis of P. aeruginosa binding to a panel of fluorescent glycopolymers possessing distinct pendant monosaccharides. All P. aeruginosa demonstrated significant binding to glycopolymers specific for α-D-galactose, β-D-N-acetylgalactosamine, and β-D-galactose-3-sulfate. In each culture, a small subpopulation accounted for the binding. The carbohydrate anomeric configuration and sulfate ester presence markedly influenced binding. While this opportunistic pathogen from CF hosts presented with various colony morphologies and physiological activities, no phenotypic, physiological, or structural feature predicted enhanced or diminished monosaccharide binding. Important to anti-adhesive therapeutic strategies, these findings suggest that, regardless of phenotype or clinical source, P. aeruginosa maintain a small subpopulation that may readily associate with specific configurations of specific monosaccharides. This report provides insights into whole-cell P. aeruginosa carbohydrate-binding profiles and into the context within which successful anti-adhesive and/or anti-virulence anti-infective agents for CF must contend.
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Affiliation(s)
- Deborah L. Chance
- Department of Molecular Microbiology & Immunology, University of Missouri School of Medicine, Columbia, MO 65212, USA
- Department of Pediatrics, University of Missouri School of Medicine, Columbia, MO 65212, USA;
| | - Wei Wang
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA;
| | - James K. Waters
- Experiment Station Chemical Laboratories, University of Missouri, Columbia, MO 65211, USA;
| | - Thomas P. Mawhinney
- Department of Pediatrics, University of Missouri School of Medicine, Columbia, MO 65212, USA;
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA;
- Experiment Station Chemical Laboratories, University of Missouri, Columbia, MO 65211, USA;
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2
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Böhning J, Tarafder AK, Bharat TA. The role of filamentous matrix molecules in shaping the architecture and emergent properties of bacterial biofilms. Biochem J 2024; 481:245-263. [PMID: 38358118 PMCID: PMC10903470 DOI: 10.1042/bcj20210301] [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: 09/18/2023] [Revised: 01/29/2024] [Accepted: 01/31/2024] [Indexed: 02/16/2024]
Abstract
Numerous bacteria naturally occur within spatially organised, multicellular communities called biofilms. Moreover, most bacterial infections proceed with biofilm formation, posing major challenges to human health. Within biofilms, bacterial cells are embedded in a primarily self-produced extracellular matrix, which is a defining feature of all biofilms. The biofilm matrix is a complex, viscous mixture primarily composed of polymeric substances such as polysaccharides, filamentous protein fibres, and extracellular DNA. The structured arrangement of the matrix bestows bacteria with beneficial emergent properties that are not displayed by planktonic cells, conferring protection against physical and chemical stresses, including antibiotic treatment. However, a lack of multi-scale information at the molecular level has prevented a better understanding of this matrix and its properties. Here, we review recent progress on the molecular characterisation of filamentous biofilm matrix components and their three-dimensional spatial organisation within biofilms.
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Affiliation(s)
- Jan Böhning
- Structural Studies Division, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, U.K
| | - Abul K. Tarafder
- Structural Studies Division, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, U.K
| | - Tanmay A.M. Bharat
- Structural Studies Division, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, U.K
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3
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Würstle S, Lee A, Kortright KE, Winzig F, An W, Stanley GL, Rajagopalan G, Harris Z, Sun Y, Hu B, Blazanin M, Hajfathalian M, Bollyky PL, Turner PE, Koff JL, Chan BK. Optimized preparation pipeline for emergency phage therapy against Pseudomonas aeruginosa at Yale University. Sci Rep 2024; 14:2657. [PMID: 38302552 PMCID: PMC10834462 DOI: 10.1038/s41598-024-52192-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 01/15/2024] [Indexed: 02/03/2024] Open
Abstract
Bacteriophage therapy is one potential strategy to treat antimicrobial resistant or persistent bacterial infections, and the year 2021 marked the centennial of Felix d'Hérelle's first publication on the clinical applications of phages. At the Center for Phage Biology & Therapy at Yale University, a preparatory modular approach has been established to offer safe and potent phages for single-patient investigational new drug applications while recognizing the time constraints imposed by infection(s). This study provides a practical walkthrough of the pipeline with an Autographiviridae phage targeting Pseudomonas aeruginosa (phage vB_PaeA_SB, abbreviated to ΦSB). Notably, a thorough phage characterization and the evolutionary selection pressure exerted on bacteria by phages, analogous to antibiotics, are incorporated into the pipeline.
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Affiliation(s)
- Silvia Würstle
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
- Technical University of Munich, 81675, Munich, Germany
| | - Alina Lee
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
| | - Kaitlyn E Kortright
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
| | - Franziska Winzig
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
- Technical University of Munich, 81675, Munich, Germany
| | - William An
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
| | - Gail L Stanley
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
| | - Govindarajan Rajagopalan
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
| | - Zach Harris
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
| | - Ying Sun
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
| | - Buqu Hu
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
| | - Michael Blazanin
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
| | - Maryam Hajfathalian
- Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Paul L Bollyky
- Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Paul E Turner
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA
- Program in Microbiology, Yale School of Medicine, New Haven, CT, 06520, USA
| | - Jonathan L Koff
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA.
- Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine, Yale School of Medicine, New Haven, CT, 06519, USA.
| | - Benjamin K Chan
- Yale Center for Phage Biology and Therapy, Yale University, 165 Prospect Street, New Haven, CT, 06520, USA.
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, 06520, USA.
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4
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Kraemer M, Bellion M, Kissmann AK, Herberger T, Synatschke CV, Bozdogan A, Andersson J, Rodriguez A, Ständker L, Wiese S, Stenger S, Spellerberg B, Gottschalk KE, Cetinkaya A, Pietrasik J, Weil T, Rosenau F. Aptamers as Novel Binding Molecules on an Antimicrobial Peptide-Armored Composite Hydrogel Wound Dressing for Specific Removal and Efficient Eradication of Pseudomonas aeruginosa. Int J Mol Sci 2023; 24:ijms24054800. [PMID: 36902270 PMCID: PMC10002764 DOI: 10.3390/ijms24054800] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/15/2023] [Accepted: 02/23/2023] [Indexed: 03/06/2023] Open
Abstract
Here we present for the first time a potential wound dressing material implementing aptamers as binding entities to remove pathogenic cells from newly contaminated surfaces of wound matrix-mimicking collagen gels. The model pathogen in this study was the Gram-negative opportunistic bacterium Pseudomonas aeruginosa, which represents a considerable health threat in hospital environments as a cause of severe infections of burn or post-surgery wounds. A two-layered hydrogel composite material was constructed based on an established eight-membered focused anti-P. aeruginosa polyclonal aptamer library, which was chemically crosslinked to the material surface to form a trapping zone for efficient binding of the pathogen. A drug-loaded zone of the composite released the C14R antimicrobial peptide to deliver it directly to the bound pathogenic cells. We demonstrate that this material combining aptamer-mediated affinity and peptide-dependent pathogen eradication can quantitatively remove bacterial cells from the "wound" surface, and we show that the surface-trapped bacteria are completely killed. The drug delivery function of the composite thus represents an extra safeguarding property and thus probably one of the most important additional advances of a next-generation or smart wound dressing ensuring the complete removal and/or eradication of the pathogen of a freshly infected wound.
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Affiliation(s)
- Markus Kraemer
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Magali Bellion
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Ann-Kathrin Kissmann
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
- Max-Planck-Institute for Polymer Research Mainz, Ackermannweg 10, 55128 Mainz, Germany
- Correspondence: (A.-K.K.); (F.R.)
| | - Tilmann Herberger
- Max-Planck-Institute for Polymer Research Mainz, Ackermannweg 10, 55128 Mainz, Germany
| | | | - Anil Bozdogan
- Center for Electrochemical Surface Technology (CEST), Austrian Institute of Technology, 3420 Tulln, Austria
- Austrian Institute of Technology, Giefinggasse 4, 1210 Vienna, Austria
| | - Jakob Andersson
- Austrian Institute of Technology, Giefinggasse 4, 1210 Vienna, Austria
| | - Armando Rodriguez
- Core Facility for Functional Peptidomics, Ulm Peptide Pharmaceuticals (U-PEP), Faculty of Medicine, Ulm University, 89081 Ulm, Germany
- Core Unit of Mass Spectrometry and Proteomics, Faculty of Medicine, Ulm University, 89081 Ulm, Germany
| | - Ludger Ständker
- Core Unit of Mass Spectrometry and Proteomics, Faculty of Medicine, Ulm University, 89081 Ulm, Germany
| | - Sebastien Wiese
- Core Unit of Mass Spectrometry and Proteomics, Faculty of Medicine, Ulm University, 89081 Ulm, Germany
| | - Steffen Stenger
- Institute for Medical Microbiology and Hygiene, University Hospital Ulm, 89081 Ulm, Germany
| | - Barbara Spellerberg
- Institute for Medical Microbiology and Hygiene, University Hospital Ulm, 89081 Ulm, Germany
| | - Kay-Eberhard Gottschalk
- Institute of Experimental Physics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Ahmet Cetinkaya
- Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Joanna Pietrasik
- Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Tanja Weil
- Max-Planck-Institute for Polymer Research Mainz, Ackermannweg 10, 55128 Mainz, Germany
| | - Frank Rosenau
- Institute of Pharmaceutical Biotechnology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
- Max-Planck-Institute for Polymer Research Mainz, Ackermannweg 10, 55128 Mainz, Germany
- Correspondence: (A.-K.K.); (F.R.)
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5
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The Lectin LecB Induces Patches with Basolateral Characteristics at the Apical Membrane to Promote Pseudomonas aeruginosa Host Cell Invasion. mBio 2022; 13:e0081922. [PMID: 35491830 PMCID: PMC9239240 DOI: 10.1128/mbio.00819-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The opportunistic bacterium Pseudomonas aeruginosa can infect mucosal tissues of the human body. To persist at the mucosal barrier, this highly adaptable pathogen has evolved many strategies, including invasion of host cells. Here, we show that the P. aeruginosa lectin LecB binds and cross-links fucosylated receptors at the apical plasma membrane of epithelial cells. This triggers a signaling cascade via Src kinases and phosphoinositide 3-kinase (PI3K), leading to the formation of patches enriched with the basolateral marker phosphatidylinositol (3,4,5)-trisphosphate (PIP3) at the apical plasma membrane. This identifies LecB as a causative bacterial factor for activating this well-known host cell response that is elicited upon apical binding of P. aeruginosa. Downstream from PI3K, Rac1 is activated to cause actin rearrangement and the outgrowth of protrusions at the apical plasma membrane. LecB-triggered PI3K activation also results in aberrant recruitment of caveolin-1 to the apical domain. In addition, we reveal a positive feedback loop between PI3K activation and apical caveolin-1 recruitment, which provides a mechanistic explanation for the previously observed implication of caveolin-1 in P. aeruginosa host cell invasion. Interestingly, LecB treatment also reversibly removes primary cilia. To directly prove the role of LecB for bacterial uptake, we coated bacterium-sized beads with LecB, which drastically enhanced their endocytosis. Furthermore, LecB deletion and LecB inhibition with l-fucose diminished the invasion efficiency of P. aeruginosa bacteria. Taken together, the results of our study identify LecB as a missing link that can explain how PI3K signaling and caveolin-1 recruitment are triggered to facilitate invasion of epithelial cells from the apical side by P. aeruginosa.
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6
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Neutron crystallography reveals mechanisms used by Pseudomonas aeruginosa for host-cell binding. Nat Commun 2022; 13:194. [PMID: 35017516 PMCID: PMC8752737 DOI: 10.1038/s41467-021-27871-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 12/15/2021] [Indexed: 12/22/2022] Open
Abstract
The opportunistic pathogen Pseudomonas aeruginosa, a major cause of nosocomial infections, uses carbohydrate-binding proteins (lectins) as part of its binding to host cells. The fucose-binding lectin, LecB, displays a unique carbohydrate-binding site that incorporates two closely located calcium ions bridging between the ligand and protein, providing specificity and unusually high affinity. Here, we investigate the mechanisms involved in binding based on neutron crystallography studies of a fully deuterated LecB/fucose/calcium complex. The neutron structure, which includes the positions of all the hydrogen atoms, reveals that the high affinity of binding may be related to the occurrence of a low-barrier hydrogen bond induced by the proximity of the two calcium ions, the presence of coordination rings between the sugar, calcium and LecB, and the dynamic behaviour of bridging water molecules at room temperature. These key structural details may assist in the design of anti-adhesive compounds to combat multi-resistance bacterial infections. Pseudomonas aeruginosa employs lectins to bind to its host cells, and is known to be the major cause of lung infections. Lectin B (LecB) from Pseudomonas aeruginosa binds specifically to galactose and fucose and is important for pathogenicity, adhesion and biofilm formation. In this work, the neutron crystal structure (1.9 Å) of the deuterated LecB/Ca/fucose complex is reported. The structure, in combination with perdeuteration of the ligand and the receptor allowed the observation of hydrogen atoms, protonation states and hydrogen bonds involved in the interaction between pathogenic bacteria and host cells. Thus the study provides structural insights into the mechanism of high affinity binding of LecB to its targets.
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7
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Jiang Z, Nero T, Mukherjee S, Olson R, Yan J. Searching for the Secret of Stickiness: How Biofilms Adhere to Surfaces. Front Microbiol 2021; 12:686793. [PMID: 34305846 PMCID: PMC8295476 DOI: 10.3389/fmicb.2021.686793] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/28/2021] [Indexed: 01/01/2023] Open
Abstract
Bacterial biofilms are communities of cells enclosed in an extracellular polymeric matrix in which cells adhere to each other and to foreign surfaces. The development of a biofilm is a dynamic process that involves multiple steps, including cell-surface attachment, matrix production, and population expansion. Increasing evidence indicates that biofilm adhesion is one of the main factors contributing to biofilm-associated infections in clinics and biofouling in industrial settings. This review focuses on describing biofilm adhesion strategies among different bacteria, including Vibrio cholerae, Pseudomonas aeruginosa, and Staphylococcus aureus. Techniques used to characterize biofilm adhesion are also reviewed. An understanding of biofilm adhesion strategies can guide the development of novel approaches to inhibit or manipulate biofilm adhesion and growth.
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Affiliation(s)
- Zhaowei Jiang
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, United States
| | - Thomas Nero
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, United States
| | - Sampriti Mukherjee
- Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL, United States
| | - Rich Olson
- Department of Molecular Biology and Biochemistry, Molecular Biophysics Program, Wesleyan University, Middletown, CT, United States
| | - Jing Yan
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, United States.,Quantitative Biology Institute, Yale University, New Haven, CT, United States
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Schulze A, Mitterer F, Pombo JP, Schild S. Biofilms by bacterial human pathogens: Clinical relevance - development, composition and regulation - therapeutical strategies. MICROBIAL CELL (GRAZ, AUSTRIA) 2021; 8:28-56. [PMID: 33553418 PMCID: PMC7841849 DOI: 10.15698/mic2021.02.741] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 01/08/2021] [Accepted: 01/12/2021] [Indexed: 12/19/2022]
Abstract
Notably, bacterial biofilm formation is increasingly recognized as a passive virulence factor facilitating many infectious disease processes. In this review we will focus on bacterial biofilms formed by human pathogens and highlight their relevance for diverse diseases. Along biofilm composition and regulation emphasis is laid on the intensively studied biofilms of Vibrio cholerae, Pseudomonas aeruginosa and Staphylococcus spp., which are commonly used as biofilm model organisms and therefore contribute to our general understanding of bacterial biofilm (patho-)physiology. Finally, therapeutical intervention strategies targeting biofilms will be discussed.
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Affiliation(s)
- Adina Schulze
- Institute of Molecular Biosciences, University of Graz, Humboldtstrasse 50, 8010 Graz, Austria
- A.S. and F.M. contributed equally to this work
| | - Fabian Mitterer
- Institute of Molecular Biosciences, University of Graz, Humboldtstrasse 50, 8010 Graz, Austria
- A.S. and F.M. contributed equally to this work
| | - Joao P. Pombo
- Institute of Molecular Biosciences, University of Graz, Humboldtstrasse 50, 8010 Graz, Austria
| | - Stefan Schild
- Institute of Molecular Biosciences, University of Graz, Humboldtstrasse 50, 8010 Graz, Austria
- BioTechMed Graz, Austria
- Field of Excellence Biohealth – University of Graz, Graz, Austria
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9
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The Pseudomonas aeruginosa Lectin LecB Causes Integrin Internalization and Inhibits Epithelial Wound Healing. mBio 2020; 11:mBio.03260-19. [PMID: 32156827 PMCID: PMC7064779 DOI: 10.1128/mbio.03260-19] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Pseudomonas aeruginosa is a ubiquitous environmental bacterium that is one of the leading causes of nosocomial infections. P. aeruginosa is able to switch between planktonic, intracellular, and biofilm-based lifestyles, which allows it to evade the immune system as well as antibiotic treatment. Hence, alternatives to antibiotic treatment are urgently required to combat P. aeruginosa infections. Lectins, like the fucose-specific LecB, are promising targets, because removal of LecB resulted in decreased virulence in mouse models. Currently, several research groups are developing LecB inhibitors. However, the role of LecB in host-pathogen interactions is not well understood. The significance of our research is in identifying cellular mechanisms of how LecB facilitates P. aeruginosa infection. We introduce LecB as a new member of the list of bacterial molecules that bind integrins and show that P. aeruginosa can move forward underneath attached epithelial cells by loosening cell-basement membrane attachment in a LecB-dependent manner. The opportunistic bacterium Pseudomonas aeruginosa produces the fucose-specific lectin LecB, which has been identified as a virulence factor. LecB has a tetrameric structure with four opposing binding sites and has been shown to act as a cross-linker. Here, we demonstrate that LecB strongly binds to the glycosylated moieties of β1-integrins on the basolateral plasma membrane of epithelial cells and causes rapid integrin endocytosis. Whereas internalized integrins were degraded via a lysosomal pathway, washout of LecB restored integrin cell surface localization, thus indicating a specific and direct action of LecB on integrins to bring about their endocytosis. Interestingly, LecB was able to trigger uptake of active and inactive β1-integrins and also of complete α3β1-integrin–laminin complexes. We provide a mechanistic explanation for this unique endocytic process by showing that LecB has the additional ability to recognize fucose-bearing glycosphingolipids and causes the formation of membrane invaginations on giant unilamellar vesicles. In cells, LecB recruited integrins to these invaginations by cross-linking integrins and glycosphingolipids. In epithelial wound healing assays, LecB specifically cleared integrins from the surface of cells located at the wound edge and blocked cell migration and wound healing in a dose-dependent manner. Moreover, the wild-type P. aeruginosa strain PAO1 was able to loosen cell-substrate adhesion in order to crawl underneath exposed cells, whereas knockout of LecB significantly reduced crawling events. Based on these results, we suggest that LecB has a role in disseminating bacteria along the cell-basement membrane interface.
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10
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Landi A, Mari M, Kleiser S, Wolf T, Gretzmeier C, Wilhelm I, Kiritsi D, Thünauer R, Geiger R, Nyström A, Reggiori F, Claudinon J, Römer W. Pseudomonas aeruginosa lectin LecB impairs keratinocyte fitness by abrogating growth factor signalling. Life Sci Alliance 2019; 2:2/6/e201900422. [PMID: 31732693 PMCID: PMC6858607 DOI: 10.26508/lsa.201900422] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 10/15/2019] [Accepted: 10/16/2019] [Indexed: 12/22/2022] Open
Abstract
Lectins are glycan-binding proteins with no catalytic activity and ubiquitously expressed in nature. Numerous bacteria use lectins to efficiently bind to epithelia, thus facilitating tissue colonisation. Wounded skin is one of the preferred niches for Pseudomonas aeruginosa, which has developed diverse strategies to impair tissue repair processes and promote infection. Here, we analyse the effect of the P. aeruginosa fucose-binding lectin LecB on human keratinocytes and demonstrate that it triggers events in the host, upon binding to fucosylated residues on cell membrane receptors, which extend beyond its role as an adhesion molecule. We found that LecB associates with insulin-like growth factor-1 receptor and dampens its signalling, leading to the arrest of cell cycle. In addition, we describe a novel LecB-triggered mechanism to down-regulate host cell receptors by showing that LecB leads to insulin-like growth factor-1 receptor internalisation and subsequent missorting towards intracellular endosomal compartments, without receptor activation. Overall, these data highlight that LecB is a multitask virulence factor that, through subversion of several host pathways, has a profound impact on keratinocyte proliferation and survival.
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Affiliation(s)
- Alessia Landi
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Muriel Mari
- Department of Biomedical Sciences of Cells & Systems, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Svenja Kleiser
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Tobias Wolf
- Institute for Research in Biomedicine, Università della Svizzera Italiana, Bellinzona, Switzerland
| | - Christine Gretzmeier
- Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Isabel Wilhelm
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany
| | - Dimitra Kiritsi
- Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Roland Thünauer
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Roger Geiger
- Institute for Research in Biomedicine, Università della Svizzera Italiana, Bellinzona, Switzerland
| | - Alexander Nyström
- Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Fulvio Reggiori
- Department of Biomedical Sciences of Cells & Systems, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Julie Claudinon
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Winfried Römer
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany .,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany
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11
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Pushing beyond the Envelope: the Potential Roles of OprF in Pseudomonas aeruginosa Biofilm Formation and Pathogenicity. J Bacteriol 2019; 201:JB.00050-19. [PMID: 31010902 DOI: 10.1128/jb.00050-19] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The ability of Pseudomonas aeruginosa to form biofilms, which are communities of cells encased in a self-produced extracellular matrix, protects the cells from antibiotics and the host immune response. While some biofilm matrix components, such as exopolysaccharides and extracellular DNA, are relatively well characterized, the extracellular matrix proteins remain understudied. Multiple proteomic analyses of the P. aeruginosa soluble biofilm matrix and outer membrane vesicles, which are a component of the matrix, have identified OprF as an abundant matrix protein. To date, the few reports on the effects of oprF mutations on biofilm formation are conflicting, and little is known about the potential role of OprF in the biofilm matrix. The majority of OprF studies focus on the protein as a cell-associated porin. As a component of the outer membrane, OprF assumes dual conformations and is involved in solute transport, as well as cell envelope integrity. Here, we review the current literature on OprF in P. aeruginosa, discussing how the structure and function of the cell-associated and matrix-associated protein may affect biofilm formation and pathogenesis in order to inform future research on this understudied matrix protein.
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12
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Passos da Silva D, Matwichuk ML, Townsend DO, Reichhardt C, Lamba D, Wozniak DJ, Parsek MR. The Pseudomonas aeruginosa lectin LecB binds to the exopolysaccharide Psl and stabilizes the biofilm matrix. Nat Commun 2019; 10:2183. [PMID: 31097723 PMCID: PMC6522473 DOI: 10.1038/s41467-019-10201-4] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 04/12/2019] [Indexed: 11/09/2022] Open
Abstract
Pseudomonas aeruginosa biofilms are composed of exopolysaccharides (EPS), exogenous DNA, and proteins that hold these communities together. P. aeruginosa produces lectins LecA and LecB, which possess affinities towards sugars found in matrix EPS and mediate adherence of P. aeruginosa to target host cells. Here, we demonstrate that LecB binds to Psl, a key matrix EPS, and this leads to increased retention of both cells and EPS in a growing biofilm. This interaction is predicted to occur between the lectin and the branched side chains present on Psl. Finally, we show that LecB coordinates Psl localization in the biofilm. This constitutes a unique function for LecB and identifies it as a matrix protein that contributes to biofilm structure through EPS interactions.
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Affiliation(s)
| | | | | | | | - Doriano Lamba
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, Sede Secondaria di Basovizza, Trieste, Italy
| | - Daniel J Wozniak
- Departments of Microbial Infection and Immunity, Microbiology, Ohio State University, Columbus, OH, USA
| | - Matthew R Parsek
- Department of Microbiology, University of Washington, Seattle, WA, USA.
- Integrative Microbiology Research Centre, South China Agricultural University, 510642, Guangzhou, China.
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13
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Wilhelm I, Levit-Zerdoun E, Jakob J, Villringer S, Frensch M, Übelhart R, Landi A, Müller P, Imberty A, Thuenauer R, Claudinon J, Jumaa H, Reth M, Eibel H, Hobeika E, Römer W. Carbohydrate-dependent B cell activation by fucose-binding bacterial lectins. Sci Signal 2019; 12:12/571/eaao7194. [PMID: 30837305 DOI: 10.1126/scisignal.aao7194] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Bacterial lectins are typically multivalent and bind noncovalently to specific carbohydrates on host tissues to facilitate bacterial adhesion. Here, we analyzed the effects of two fucose-binding lectins, BambL from Burkholderia ambifaria and LecB from Pseudomonas aeruginosa, on specific signaling pathways in B cells. We found that these bacterial lectins induced B cell activation, which, in vitro, was dependent on the cell surface expression of the B cell antigen receptor (BCR) and its co-receptor CD19, as well as on spleen tyrosine kinase (Syk) activity. The resulting release of intracellular Ca2+ was followed by an increase in the cell surface abundance of the activation marker CD86, augmented cytokine secretion, and subsequent cell death, replicating all of the events that are observed in vitro upon canonical and antigen-mediated B cell activation. Moreover, injection of BambL in mice resulted in a substantial, BCR-independent loss of B cells in the bone marrow with simultaneous, transient enlargement of the spleen (splenomegaly), as well as an increase in the numbers of splenic B cells and myeloid cells. Together, these data suggest that bacterial lectins can initiate polyclonal activation of B cells through their sole capacity to bind to fucose.
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Affiliation(s)
- Isabel Wilhelm
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Ella Levit-Zerdoun
- Max Planck Institute of Immunology and Epigenetics Freiburg, 79108 Freiburg, Germany.,International Max Planck Research School (IMPRS), Max Planck Institute of Immunobiology and Epigenetics Freiburg, 79108 Freiburg, Germany.,German Cancer Consortium (DKTK) partner site Freiburg, German Cancer Center (DKFZ), Heidelberg, Institute of Molecular Medicine and Cell Research, 79104 Freiburg, Germany
| | - Johanna Jakob
- Institute for Immunology, University Medical Centre Ulm, 89081 Ulm, Germany
| | - Sarah Villringer
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Marco Frensch
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany.,International Max Planck Research School (IMPRS), Max Planck Institute of Immunobiology and Epigenetics Freiburg, 79108 Freiburg, Germany
| | - Rudolf Übelhart
- Institute for Immunology, University Medical Centre Ulm, 89081 Ulm, Germany
| | - Alessia Landi
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Peter Müller
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Anne Imberty
- Univ. Grenoble Alpes, CNRS, CERMAV, 38000 Grenoble, France
| | - Roland Thuenauer
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Julie Claudinon
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Hassan Jumaa
- Institute for Immunology, University Medical Centre Ulm, 89081 Ulm, Germany
| | - Michael Reth
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany.,Max Planck Institute of Immunology and Epigenetics Freiburg, 79108 Freiburg, Germany
| | - Hermann Eibel
- CCI-Center for Chronic Immunodeficiency (CCI), University Medical Centre, 79106 Freiburg, Germany.,Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Elias Hobeika
- Institute for Immunology, University Medical Centre Ulm, 89081 Ulm, Germany.
| | - Winfried Römer
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany. .,Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104 Freiburg, Germany.,Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
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14
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Bhargava A, Pareek V, Roy Choudhury S, Panwar J, Karmakar S. Superior Bactericidal Efficacy of Fucose-Functionalized Silver Nanoparticles against Pseudomonas aeruginosa PAO1 and Prevention of Its Colonization on Urinary Catheters. ACS APPLIED MATERIALS & INTERFACES 2018; 10:29325-29337. [PMID: 30096228 DOI: 10.1021/acsami.8b09475] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Pseudomonas aeruginosa, a Gram-negative rod-shaped bacterium is a notorious pathogen causing chronic infections. Its ability to form antibiotic-resistant biofilm has raised the need for the development of alternative treatment approaches. An ideal alternate can be silver nanoparticles known for their strong yet tunable bactericidal activity. However, their use in commercial in vivo medicine could not see the light of the day because of the unwanted toxicity of silver in the host cells at higher concentrations. Thus, strategies which can modulate the bacterial cell-silver nanoparticle interactions thereby reducing the amount of nanoparticles required to kill a typical number of bacterial cells are utmost welcomed. The current work showcases one such strategy by functionalizing the silver nanoparticles with l-fucose to increase their interactions with the LecB lectins present on P. aeruginosa PAO1. The advantage of this approach lies in the higher bactericidal and antibiofilm activity of fucose-functionalized silver nanoparticles (FNPs) as compared to the citrate-capped silver nanoparticles (CNPs) of similar size and concentrations. The superior bactericidal potential of FNPs as demonstrated by fluorescence-assisted cell sorting, confocal laser scanning microscopy, and transmission electron microscopy analyses may be attributed to the higher reactive oxygen species generation and oxidative membrane damage. Additionally, FNPs prevented the formation of biofilms by downregulating the expression of various virulence genes at lower concentrations as compared to CNPs. The practical applicability of the approach was demonstrated by preventing bacterial colonization on artificial silicone rubber surfaces. These results can be extrapolated in the treatment of catheter-associated urinary tract infections caused by P. aeruginosa. In conclusion, the present work strongly advocates the use of antivirulence targets and their corresponding binding residues for the augmentation of the bactericidal effect of silver nanoparticles.
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Affiliation(s)
- Arpit Bhargava
- Institute of Nano Science and Technology , Habitat Centre, Phase-10 , Mohali 160062 , Punjab , India
| | - Vikram Pareek
- Department of Biological Sciences , Birla Institute of Technology and Science , Pilani 333031 , Rajasthan , India
| | - Subhasree Roy Choudhury
- Institute of Nano Science and Technology , Habitat Centre, Phase-10 , Mohali 160062 , Punjab , India
| | - Jitendra Panwar
- Department of Biological Sciences , Birla Institute of Technology and Science , Pilani 333031 , Rajasthan , India
| | - Surajit Karmakar
- Institute of Nano Science and Technology , Habitat Centre, Phase-10 , Mohali 160062 , Punjab , India
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15
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Worstell NC, Singla A, Saenkham P, Galbadage T, Sule P, Lee D, Mohr A, Kwon JSI, Cirillo JD, Wu HJ. Hetero-Multivalency of Pseudomonas aeruginosa Lectin LecA Binding to Model Membranes. Sci Rep 2018; 8:8419. [PMID: 29849092 PMCID: PMC5976636 DOI: 10.1038/s41598-018-26643-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 05/16/2018] [Indexed: 12/29/2022] Open
Abstract
A single glycan-lectin interaction is often weak and semi-specific. Multiple binding domains in a single lectin can bind with multiple glycan molecules simultaneously, making it difficult for the classic “lock-and-key” model to explain these interactions. We demonstrated that hetero-multivalency, a homo-oligomeric protein simultaneously binding to at least two types of ligands, influences LecA (a Pseudomonas aeruginosa adhesin)-glycolipid recognition. We also observed enhanced binding between P. aeruginosa and mixed glycolipid liposomes. Interestingly, strong ligands could activate weaker binding ligands leading to higher LecA binding capacity. This hetero-multivalency is probably mediated via a simple mechanism, Reduction of Dimensionality (RD). To understand the influence of RD, we also modeled LecA’s two-step binding process with membranes using a kinetic Monte Carlo simulation. The simulation identified the frequency of low-affinity ligand encounters with bound LecA and the bound LecA’s retention of the low-affinity ligand as essential parameters for triggering hetero-multivalent binding, agreeing with experimental observations. The hetero-multivalency can alter lectin binding properties, including avidities, capacities, and kinetics, and therefore, it likely occurs in various multivalent binding systems. Using hetero-multivalency concept, we also offered a new strategy to design high-affinity drug carriers for targeted drug delivery.
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Affiliation(s)
- Nolan C Worstell
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA
| | - Akshi Singla
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA
| | - Panatda Saenkham
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, USA
| | - Thushara Galbadage
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, USA
| | - Preeti Sule
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, USA
| | - Dongheon Lee
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA
| | - Alec Mohr
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA
| | - Joseph Sang-Il Kwon
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA
| | - Jeffrey D Cirillo
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, USA
| | - Hung-Jen Wu
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA.
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16
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Bodenberger N, Kubiczek D, Halbgebauer D, Rimola V, Wiese S, Mayer D, Rodriguez Alfonso AA, Ständker L, Stenger S, Rosenau F. Lectin-Functionalized Composite Hydrogels for “Capture-and-Killing” of Carbapenem-Resistant Pseudomonas aeruginosa. Biomacromolecules 2018; 19:2472-2482. [DOI: 10.1021/acs.biomac.8b00089] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Nicholas Bodenberger
- Center for Peptide Pharmaceuticals, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
- Synthesis of Macromolecules Department, Max-Planck-Institute for Polymer Research, 55128 Mainz, Germany
| | - Dennis Kubiczek
- Center for Peptide Pharmaceuticals, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
| | - Daniel Halbgebauer
- Center for Peptide Pharmaceuticals, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
| | - Vittoria Rimola
- Center for Peptide Pharmaceuticals, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
| | - Sebastian Wiese
- Core Unit Mass Spectrometry and Proteomics, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
| | - Daniel Mayer
- Institute for Medical Microbiology and Hygiene, University Hospital Ulm, 89070 Ulm, Germany
| | | | - Ludger Ständker
- Center for Peptide Pharmaceuticals, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
- Core Facility Functional Peptidomics, Faculty of Medicine, Ulm University 89081 Ulm, Germany
| | - Steffen Stenger
- Institute for Medical Microbiology and Hygiene, University Hospital Ulm, 89070 Ulm, Germany
| | - Frank Rosenau
- Center for Peptide Pharmaceuticals, Faculty of Natural Science, Ulm University, 89081 Ulm, Germany
- Synthesis of Macromolecules Department, Max-Planck-Institute for Polymer Research, 55128 Mainz, Germany
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17
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Song F, Wang H, Sauer K, Ren D. Cyclic-di-GMP and oprF Are Involved in the Response of Pseudomonas aeruginosa to Substrate Material Stiffness during Attachment on Polydimethylsiloxane (PDMS). Front Microbiol 2018; 9:110. [PMID: 29449837 PMCID: PMC5799285 DOI: 10.3389/fmicb.2018.00110] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 01/17/2018] [Indexed: 12/29/2022] Open
Abstract
Recently, we reported that the stiffness of poly(dimethylsiloxane) (PDMS) affects the attachment of Pseudomonas aeruginosa, and the morphology and antibiotic susceptibility of attached cells. To further understand how P. aeruginosa responses to material stiffness during attachment, the wild-type P. aeruginosa PAO1 and several isogenic mutants were characterized for their attachment on soft and stiff PDMS. Compared to the wild-type strain, mutation of the oprF gene abolished the differences in attachment, growth, and size of attached cells between soft and stiff PDMS surfaces. These defects were rescued by genetic complementation of oprF. We also found that the wild-type P. aeruginosa PAO1 cells attached on soft (40:1) PDMS have higher level of intracellular cyclic dimeric guanosine monophosphate (c-di-GMP), a key regulator of biofilm formation, compared to those on stiff (5:1) PDMS surfaces. Consistently, the mutants of fleQ and wspF, which have similar high-level c-di-GMP as the oprF mutant, exhibited defects in response to PDMS stiffness during attachment. Collectively, the results from this study suggest that P. aeruginosa can sense the stiffness of substrate material during attachment and respond to such mechanical cues by adjusting c-di-GMP level and thus the following biofilm formation. Further understanding of the related genes and pathways will provide new insights into bacterial mechanosensing and help develop better antifouling materials.
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Affiliation(s)
- Fangchao Song
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY, United States.,Syracuse Biomaterials Institute, Syracuse, NY, United States
| | - Hao Wang
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY, United States.,Syracuse Biomaterials Institute, Syracuse, NY, United States
| | - Karin Sauer
- Department of Biological Science, Binghamton University, Binghamton, NY, United States
| | - Dacheng Ren
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY, United States.,Syracuse Biomaterials Institute, Syracuse, NY, United States.,Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, United States.,Department of Biology, Syracuse University, Syracuse, NY, United States
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18
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Chevalier S, Bouffartigues E, Bodilis J, Maillot O, Lesouhaitier O, Feuilloley MGJ, Orange N, Dufour A, Cornelis P. Structure, function and regulation of Pseudomonas aeruginosa porins. FEMS Microbiol Rev 2017; 41:698-722. [PMID: 28981745 DOI: 10.1093/femsre/fux020] [Citation(s) in RCA: 218] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 04/24/2017] [Indexed: 12/11/2022] Open
Abstract
Pseudomonas aeruginosa is a Gram-negative bacterium belonging to the γ-proteobacteria. Like other members of the Pseudomonas genus, it is known for its metabolic versatility and its ability to colonize a wide range of ecological niches, such as rhizosphere, water environments and animal hosts, including humans where it can cause severe infections. Another particularity of P. aeruginosa is its high intrinsic resistance to antiseptics and antibiotics, which is partly due to its low outer membrane permeability. In contrast to Enterobacteria, pseudomonads do not possess general diffusion porins in their outer membrane, but rather express specific channel proteins for the uptake of different nutrients. The major outer membrane 'porin', OprF, has been extensively investigated, and displays structural, adhesion and signaling functions while its role in the diffusion of nutrients is still under discussion. Other porins include OprB and OprB2 for the diffusion of glucose, the two small outer membrane proteins OprG and OprH, and the two porins involved in phosphate/pyrophosphate uptake, OprP and OprO. The remaining nineteen porins belong to the so-called OprD (Occ) family, which is further split into two subfamilies termed OccD (8 members) and OccK (11 members). In the past years, a large amount of information concerning the structure, function and regulation of these porins has been published, justifying why an updated review is timely.
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Affiliation(s)
- Sylvie Chevalier
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Emeline Bouffartigues
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Josselin Bodilis
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Olivier Maillot
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Olivier Lesouhaitier
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Marc G J Feuilloley
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Nicole Orange
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
| | - Alain Dufour
- IUEM, Laboratoire de Biotechnologie et Chimie Marines EA 3884, Université de Bretagne-Sud (UEB), 56321 Lorient, France
| | - Pierre Cornelis
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Normandy University, 27000 Evreux, France
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19
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Di Bonaventura I, Jin X, Visini R, Probst D, Javor S, Gan BH, Michaud G, Natalello A, Doglia SM, Köhler T, van Delden C, Stocker A, Darbre T, Reymond JL. Chemical space guided discovery of antimicrobial bridged bicyclic peptides against Pseudomonas aeruginosa and its biofilms. Chem Sci 2017; 8:6784-6798. [PMID: 29147502 PMCID: PMC5643981 DOI: 10.1039/c7sc01314k] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 07/12/2017] [Indexed: 12/15/2022] Open
Abstract
Herein we report the discovery of antimicrobial bridged bicyclic peptides (AMBPs) active against Pseudomonas aeruginosa, a highly problematic Gram negative bacterium in the hospital environment. Two of these AMBPs show strong biofilm inhibition and dispersal activity and enhance the activity of polymyxin, currently a last resort antibiotic against which resistance is emerging. To discover our AMBPs we used the concept of chemical space, which is well known in the area of small molecule drug discovery, to define a small number of test compounds for synthesis and experimental evaluation. Our chemical space was calculated using 2DP, a new topological shape and pharmacophore fingerprint for peptides. This method provides a general strategy to search for bioactive peptides with unusual topologies and expand the structural diversity of peptide-based drugs.
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Affiliation(s)
- Ivan Di Bonaventura
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Xian Jin
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Ricardo Visini
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Daniel Probst
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Sacha Javor
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Bee-Ha Gan
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Gaëlle Michaud
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Antonino Natalello
- Department of Biotechnology and Biosciences , University of Milano-Bicocca , Piazza della Scienza 2 , 20126 Milan , Italy
| | - Silvia Maria Doglia
- Department of Biotechnology and Biosciences , University of Milano-Bicocca , Piazza della Scienza 2 , 20126 Milan , Italy
| | - Thilo Köhler
- Department of Microbiology and Molecular Medicine , University of Geneva, and Service of Infectious Diseases , University Hospital of Geneva , Geneva , Switzerland
| | - Christian van Delden
- Department of Microbiology and Molecular Medicine , University of Geneva, and Service of Infectious Diseases , University Hospital of Geneva , Geneva , Switzerland
| | - Achim Stocker
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Tamis Darbre
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Jean-Louis Reymond
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
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20
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He R, Di Bonaventura I, Visini R, Gan BH, Fu Y, Probst D, Lüscher A, Köhler T, van Delden C, Stocker A, Hong W, Darbre T, Reymond JL. Design, crystal structure and atomic force microscopy study of thioether ligated d,l-cyclic antimicrobial peptides against multidrug resistant Pseudomonas aeruginosa. Chem Sci 2017; 8:7464-7475. [PMID: 29163899 PMCID: PMC5676089 DOI: 10.1039/c7sc01599b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 09/02/2017] [Indexed: 11/30/2022] Open
Abstract
A new family of cyclic antimicrobial peptides is reported targeting multidrug resistant Pseudomonas aeruginosa by membrane disruption.
Here we report a new family of cyclic antimicrobial peptides (CAMPs) targeting MDR strains of Pseudomonas aeruginosa. These CAMPs are cyclized via a xylene double thioether bridge connecting two cysteines placed at the ends of a linear amphiphilic alternating d,l-sequence composed of lysines and tryptophans. Investigations by transmission electron microscopy (TEM), dynamic light scattering and atomic force microscopy (AFM) suggest that these peptide macrocycles interact with the membrane to form lipid–peptide aggregates. Amphiphilic conformations compatible with membrane disruption are observed in high resolution X-ray crystal structures of fucosylated derivatives in complex with lectin LecB. The potential for optimization is highlighted by N-methylation of backbone amides leading to derivatives with similar antimicrobial activity but lower hemolysis.
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Affiliation(s)
- Runze He
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Ivan Di Bonaventura
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Ricardo Visini
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Bee-Ha Gan
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Yongchun Fu
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Daniel Probst
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Alexandre Lüscher
- Department of Microbiology and Molecular Medicine , University of Geneva , Service of Infectious Diseases , University Hospital of Geneva , Geneva , Switzerland
| | - Thilo Köhler
- Department of Microbiology and Molecular Medicine , University of Geneva , Service of Infectious Diseases , University Hospital of Geneva , Geneva , Switzerland
| | - Christian van Delden
- Department of Microbiology and Molecular Medicine , University of Geneva , Service of Infectious Diseases , University Hospital of Geneva , Geneva , Switzerland
| | - Achim Stocker
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Wenjing Hong
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland . .,State Key Laboratory of Physical Chemistry of Solid Surfaces , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Tamis Darbre
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
| | - Jean-Louis Reymond
- Department of Chemistry and Biochemistry , University of Bern , Freiestrasse 3 , 3012 Bern , Switzerland .
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21
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Lectin-mediated reversible immobilization of human cells into a glycosylated macroporous protein hydrogel as a cell culture matrix. Sci Rep 2017; 7:6151. [PMID: 28733655 PMCID: PMC5522389 DOI: 10.1038/s41598-017-06240-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 06/12/2017] [Indexed: 12/19/2022] Open
Abstract
3D cell culture is a helpful approach to study cell-cell interaction in a native-like environment, but is often limited due the challenge of retrieving cells from the material. In this study, we present the use of recombinant lectin B, a sugar-binding protein with four binding cavities, to enable reversible cell integration into a macroporous protein hydrogel matrix. By functionalizing hydrogel precursors with saccharose, lectin B can both bind to sugar moieties on the cellular surface as well as to the modified hydrogel network. Confocal microscopy and flow cytometry analysis revealed cells to be integrated into the network and to adhere and proliferate. Furthermore, the specificity and reversibility was investigated by using a recombinantly produced yellow fluorescent - lectin B fusion protein and a variety of sugars with diverging affinities for lectin B at different concentrations and elution times. Cells could be eluted within minutes by addition of L-fucose to the cell-loaded hydrogels to make cells available for further analysis.
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Dosunmu EF, Chaudhari AA, Bawage S, Bakeer MK, Owen DR, Singh SR, Dennis VA, Pillai SR. Novel cationic peptide TP359 down-regulates the expression of outer membrane biogenesis genes in Pseudomonas aeruginosa: a potential TP359 anti-microbial mechanism. BMC Microbiol 2016; 16:192. [PMID: 27549081 PMCID: PMC4994277 DOI: 10.1186/s12866-016-0808-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 08/10/2016] [Indexed: 11/18/2022] Open
Abstract
Background Antimicrobial peptides (AMPs) are a class of antimicrobial agents with broad-spectrum activities. Several reports indicate that cationic AMPs bind to the negatively charged bacterial membrane causing membrane depolarization and damage. However, membrane depolarization and damage may be insufficient to elicit cell death, thereby suggesting that other mechanism(s) of action could be involved in this phenomenon. In this study, we investigated the antimicrobial activity of a novel antimicrobial peptide, TP359, against two strains of Pseudomonas aeruginosa, as well as its possible mechanisms of action. Results TP359 proved to be bactericidal against P. aeruginosa as confirmed by the reduced bacteria counts, membrane damage and cytoplasmic membrane depolarization. In addition, it was non-toxic to mouse J774 macrophages and human lung A549 epithelial cells. Electron microscopy analysis showed TP359 bactericidal effects by structural changes of the bacteria from viable rod-shaped cells to those with cell membrane damages, proceeding into the efflux of cytoplasmic contents and emergence of ghost cells. Gene expression analysis on the effects of TP359 on outer membrane biogenesis genes underscored marked down-regulation, particularly of oprF, which encodes a major structural and outer membrane porin (OprF) in both strains studied, indicating that the peptide may cause deregulation of outer membrane genes and reduced structural stability which could lead to cell death. Conclusion Our data shows that TP359 has potent antimicrobial activity against P aeruginosa. The correlation between membrane damage, depolarization and reduced expression of outer membrane biogenesis genes, particularly oprF may suggest the bactericidal mechanism of action of the TP359 peptide. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0808-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ejovwoke F Dosunmu
- Center for NanoBiotechnology Research, Alabama State University, Montgomery, AL, USA
| | - Atul A Chaudhari
- Center for NanoBiotechnology Research, Alabama State University, Montgomery, AL, USA
| | - Swapnil Bawage
- Center for NanoBiotechnology Research, Alabama State University, Montgomery, AL, USA
| | - Mona K Bakeer
- LSU Health Sciences Center, School of Allied Health Professions, New Orleans, LA, USA
| | | | - Shree R Singh
- Center for NanoBiotechnology Research, Alabama State University, Montgomery, AL, USA
| | - Vida A Dennis
- Center for NanoBiotechnology Research, Alabama State University, Montgomery, AL, USA
| | - Shreekumar R Pillai
- Center for NanoBiotechnology Research, Alabama State University, Montgomery, AL, USA.
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Abstract
Proteinaceous components of the biofilm matrix include secreted extracellular proteins, cell surface adhesins, and protein subunits of cell appendages such as flagella and pili. Biofilm matrix proteins play diverse roles in biofilm formation and dissolution. They are involved in attaching cells to surfaces, stabilizing the biofilm matrix via interactions with exopolysaccharide and nucleic acid components, developing three-dimensional biofilm architectures, and dissolving biofilm matrix via enzymatic degradation of polysaccharides, proteins, and nucleic acids. In this article, we will review functions of matrix proteins in a selected set of microorganisms, studies of the matrix proteomes of Vibrio cholerae and Pseudomonas aeruginosa, and roles of outer membrane vesicles and of nucleoid-binding proteins in biofilm formation.
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Cott C, Thuenauer R, Landi A, Kühn K, Juillot S, Imberty A, Madl J, Eierhoff T, Römer W. Pseudomonas aeruginosa lectin LecB inhibits tissue repair processes by triggering β-catenin degradation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1863:1106-18. [PMID: 26862060 PMCID: PMC4859328 DOI: 10.1016/j.bbamcr.2016.02.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2015] [Revised: 01/31/2016] [Accepted: 02/05/2016] [Indexed: 01/08/2023]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that induces severe lung infections such as ventilator-associated pneumonia and acute lung injury. Under these conditions, the bacterium diminishes epithelial integrity and inhibits tissue repair mechanisms, leading to persistent infections. Understanding the involved bacterial virulence factors and their mode of action is essential for the development of new therapeutic approaches. In our study we discovered a so far unknown effect of the P. aeruginosa lectin LecB on host cell physiology. LecB alone was sufficient to attenuate migration and proliferation of human lung epithelial cells and to induce transcriptional activity of NF-κB. These effects are characteristic of impaired tissue repair. Moreover, we found a strong degradation of β-catenin, which was partially recovered by the proteasome inhibitor lactacystin. In addition, LecB induced loss of cell-cell contacts and reduced expression of the β-catenin targets c-myc and cyclin D1. Blocking of LecB binding to host cell plasma membrane receptors by soluble l-fucose prevented these changes in host cell behavior and signaling, and thereby provides a powerful strategy to suppress LecB function. Our findings suggest that P. aeruginosa employs LecB as a virulence factor to induce β-catenin degradation, which then represses processes that are directly linked to tissue recovery.
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Affiliation(s)
- Catherine Cott
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Roland Thuenauer
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Alessia Landi
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Katja Kühn
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Samuel Juillot
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; Spemann Graduate School of Biology and Medicine (SGBM), Albert-Ludwigs-University Freiburg, Albertstraße 19, 79104 Freiburg, Germany
| | - Anne Imberty
- Centre de Recherches sur les Macromolécules Végétales, UPR5301 CNRS and University of Grenoble Alpes, BP53, 38041 Grenoble cédex 09, France
| | - Josef Madl
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Thorsten Eierhoff
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Winfried Römer
- Faculty of Biology, Schänzlestraße 1, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestraße 18, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany; Spemann Graduate School of Biology and Medicine (SGBM), Albert-Ludwigs-University Freiburg, Albertstraße 19, 79104 Freiburg, Germany.
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25
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Michaud G, Visini R, Bergmann M, Salerno G, Bosco R, Gillon E, Richichi B, Nativi C, Imberty A, Stocker A, Darbre T, Reymond JL. Overcoming antibiotic resistance in Pseudomonas aeruginosa biofilms using glycopeptide dendrimers. Chem Sci 2016; 7:166-182. [PMID: 29896342 PMCID: PMC5953009 DOI: 10.1039/c5sc03635f] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 11/23/2015] [Indexed: 12/12/2022] Open
Abstract
Antibiotic resistance in the opportunistic pathogen Pseudomonas aeruginosa is partly caused by biofilms forming a physical barrier to antibiotic penetration. Here we focused on modifying tetravalent glycopeptide dendrimer ligands of P. aeruginosa lectins LecB or LecA to increase their biofilm inhibition activity. First heteroglycoclusters were investigated displaying one pair each of LecB specific fucosyl groups and LecA specific galactosyl groups and binding simultaneously to both lectins, one of which gave the first fully resolved crystal structure of a peptide dendrimer as LecB complex providing a structural model for dendrimer-lectin interactions (PDB ; 5D2A). Biofilm inhibition was increased by introducing additional cationic residues in these dendrimers but resulted in bactericidal effects similar to those of non-glycosylated polycationic antimicrobial peptide dendrimers. In a second approach dendrimers displaying four copies of the natural LecB ligand Lewisa were prepared leading to slightly stronger LecB binding and biofilm inhibition. Finally synergistic application of a LecB specific non-bactericidal antibiofilm dendrimer with the antibiotic tobramycin at sub-inhibitory concentrations of both compounds allowed effective biofilm inhibition and dispersal.
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Affiliation(s)
- Gaëlle Michaud
- Department of Chemistry and Biochemistry , University of Berne , Freiestrasse 3 , 3012 Berne , Switzerland .
| | - Ricardo Visini
- Department of Chemistry and Biochemistry , University of Berne , Freiestrasse 3 , 3012 Berne , Switzerland .
| | - Myriam Bergmann
- Department of Chemistry and Biochemistry , University of Berne , Freiestrasse 3 , 3012 Berne , Switzerland .
| | - Gianluca Salerno
- Dipartimento di Chimica , Polo Scientifico e Tecnologico , Universita' degli Studi di Firenze , Via della Lastruccia 3, 13, I-50019 Sesto Fiorentino , Firenze , Italy
| | - Rosa Bosco
- Dipartimento di Chimica , Polo Scientifico e Tecnologico , Universita' degli Studi di Firenze , Via della Lastruccia 3, 13, I-50019 Sesto Fiorentino , Firenze , Italy
| | - Emilie Gillon
- Centre de Recherches sur les Macromolécules Végétales , UPR5301 , CNRS and Université Grenoble Alpes , 601 rue de la Chimie , F38041 Grenoble , France
| | - Barbara Richichi
- Dipartimento di Chimica , Polo Scientifico e Tecnologico , Universita' degli Studi di Firenze , Via della Lastruccia 3, 13, I-50019 Sesto Fiorentino , Firenze , Italy
| | - Cristina Nativi
- Dipartimento di Chimica , Polo Scientifico e Tecnologico , Universita' degli Studi di Firenze , Via della Lastruccia 3, 13, I-50019 Sesto Fiorentino , Firenze , Italy
| | - Anne Imberty
- Centre de Recherches sur les Macromolécules Végétales , UPR5301 , CNRS and Université Grenoble Alpes , 601 rue de la Chimie , F38041 Grenoble , France
| | - Achim Stocker
- Department of Chemistry and Biochemistry , University of Berne , Freiestrasse 3 , 3012 Berne , Switzerland .
| | - Tamis Darbre
- Department of Chemistry and Biochemistry , University of Berne , Freiestrasse 3 , 3012 Berne , Switzerland .
| | - Jean-Louis Reymond
- Department of Chemistry and Biochemistry , University of Berne , Freiestrasse 3 , 3012 Berne , Switzerland .
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Singh N, Shetye GS, Zheng H, Sun J, Luk YY. Chemical Signals of Synthetic Disaccharide Derivatives Dominate Rhamnolipids at Controlling Multiple Bacterial Activities. Chembiochem 2015; 17:102-11. [DOI: 10.1002/cbic.201500396] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Indexed: 02/04/2023]
Affiliation(s)
- Nischal Singh
- Department of Chemistry; Syracuse University; 1-014 CST, 111 College Place Syracuse NY 13244 USA
| | - Gauri S. Shetye
- Department of Chemistry; Syracuse University; 1-014 CST, 111 College Place Syracuse NY 13244 USA
| | - Hewen Zheng
- Department of Chemistry; Syracuse University; 1-014 CST, 111 College Place Syracuse NY 13244 USA
| | - Jiayue Sun
- Department of Chemistry; Syracuse University; 1-014 CST, 111 College Place Syracuse NY 13244 USA
| | - Yan-Yeung Luk
- Department of Chemistry; Syracuse University; 1-014 CST, 111 College Place Syracuse NY 13244 USA
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27
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Liu L, Chi H, Sun L. Pseudomonas fluorescens: identification of Fur-regulated proteins and evaluation of their contribution to pathogenesis. DISEASES OF AQUATIC ORGANISMS 2015; 115:67-80. [PMID: 26119301 DOI: 10.3354/dao02874] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Pseudomonas fluorescens is a Gram-negative bacterium and a common pathogen to a wide range of farmed fish. In a previous study, we found that the ferric uptake regulator gene (fur) is essential to the infectivity of a pathogenic fish isolate of P. fluorescens (wild-type strain TSS). In the present work, we conducted comparative proteomic analysis to examine the global protein profiles of TSS and the P. fluorescens fur knockout mutant TFM. Twenty-eight differentially produced proteins were identified, which belong to different functional categories. Four of these proteins, viz. TssP (a type VI secretion protein), PspA (a serine protease), OprF (an outer membrane porin), and ClpP (the proteolytic subunit of an ATP-dependent Clp protease), were assessed for virulence participation in a model of turbot Scophthalmus maximus. The results showed that the oprF and clpP knockouts exhibited significantly reduced capacities in (1) resistance against the bactericidal effect of host serum, (2) dissemination into and colonization of host tissues, and (3) inducing host mortality. In contrast, mutation of tssP and pspA had no apparent effect on the pathogenicity of TSS. Purified recombinant OprF, when used as a subunit vaccine, induced production of specific serum antibodies in immunized fish and elicited significant protection against lethal TSS challenge. Antibody blocking of the OprF in TSS significantly impaired the ability of the bacteria to invade host tissues. Taken together, these results indicate for the first time that in pathogenic P. fluorescens, Fur regulates the expression of diverse proteins, some of which are required for optimal infection.
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Affiliation(s)
- Li Liu
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, PR China
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28
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Grishin AV, Krivozubov MS, Karyagina AS, Gintsburg AL. Pseudomonas Aeruginosa Lectins As Targets for Novel Antibacterials. Acta Naturae 2015; 7:29-41. [PMID: 26085942 PMCID: PMC4463410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Pseudomonas aeruginosa is one of the most widespread and troublesome opportunistic pathogens that is capable of colonizing various human tissues and organs and is often resistant to many currently used antibiotics. This resistance is caused by different factors, including the acquisition of specific resistance genes, intrinsic capability to diminish antibiotic penetration into the bacterial cell, and the ability to form biofilms. This situation has prompted the development of novel compounds differing in their mechanism of action from traditional antibiotics that suppress the growth of microorganisms or directly kill bacteria. Instead, these new compounds should decrease the pathogens' ability to colonize and damage human tissues by inhibiting the virulence factors and biofilm formation. The lectins LecA and LecB that bind galactose and fucose, as well as oligo- and polysaccharides containing these sugars, are among the most thoroughly-studied targets for such novel antibacterials. In this review, we summarize the results of experiments highlighting the importance of these proteins for P. aeruginosa pathogenicity and provide information on existing lectins inhibitors and their effectiveness in various experimental models. Particular attention is paid to the effects of lectins inhibition in animal models of infection and in clinical practice. We argue that lectins inhibition is a perspective approach to combating P. aeruginosa. However, despite the existence of highly effective in vitro inhibitors, further experiments are required in order to advance these inhibitors into pre-clinical studies.
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Affiliation(s)
- A. V. Grishin
- Gamaleya Research Center of Epidemiology and Microbiology, Gamaleya Str., 18, Moscow, 123098, Russia,Institute of Agricultural Biotechnology, Timiryazevskaya Str., 42, Moscow, 127550, Russia
| | - M. S. Krivozubov
- Gamaleya Research Center of Epidemiology and Microbiology, Gamaleya Str., 18, Moscow, 123098, Russia
| | - A. S. Karyagina
- Gamaleya Research Center of Epidemiology and Microbiology, Gamaleya Str., 18, Moscow, 123098, Russia,Institute of Agricultural Biotechnology, Timiryazevskaya Str., 42, Moscow, 127550, Russia,Belozersky Institute of Physical and Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, 1, bld. 40, Moscow, 119991, Russia
| | - A. L. Gintsburg
- Gamaleya Research Center of Epidemiology and Microbiology, Gamaleya Str., 18, Moscow, 123098, Russia
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29
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Kumar A, Ting YP. Effect of sub-inhibitory antibacterial stress on bacterial surface properties and biofilm formation. Colloids Surf B Biointerfaces 2013; 111:747-54. [DOI: 10.1016/j.colsurfb.2013.07.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 06/26/2013] [Accepted: 07/03/2013] [Indexed: 10/26/2022]
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30
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Duchesne R, Bouffartigues E, Oxaran V, Maillot O, Bénard M, Feuilloley MGJ, Orange N, Chevalier S. A proteomic approach of SigX function in Pseudomonas aeruginosa outer membrane composition. J Proteomics 2013; 94:451-9. [PMID: 24332064 DOI: 10.1016/j.jprot.2013.10.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/29/2013] [Accepted: 10/17/2013] [Indexed: 12/22/2022]
Abstract
UNLABELLED SigX is one of the 19 extracytoplasmic function sigma factors that have been predicted in the human opportunistic pathogen Pseudomonas aeruginosa genome. SigX is involved in the transcription of oprF, encoding the major outer membrane protein OprF, a pleiotropic porin that contributes to the maintaining of the wall structure, and is essential to P. aeruginosa virulence. This study aimed to get further insights into the functions of SigX. We performed here an outer membrane subproteome of a sigX mutant. Proteomic investigations revealed lower production of 8 porins among which 4 gated channels involved in iron or hem uptake, OprF, and the three substrate-specific proteins OprD, OprQ and OprE. On the other side, the glucose-specific porin OprB and the lipid A 3-O-deacylase that is involved in LPS modification were up-regulated. Our results indicate that SigX may be involved in the control and/or regulation of the outer membrane composition. BIOLOGICAL SIGNIFICANCE A proteomic approach was used herein to get further insights into SigX functions in P. aeruginosa. The data presented here suggest that SigX is involved in the outer membrane protein composition, and could be linked to a regulatory network involved in OM homeostasis.
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Affiliation(s)
- Rachel Duchesne
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France
| | - Emeline Bouffartigues
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France
| | - Virginie Oxaran
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France
| | - Olivier Maillot
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France
| | - Magalie Bénard
- Cell Imaging Platform of Normandy (PRIMACEN), IRIB, Faculty of Sciences, University of Rouen, Mont-Saint-Aignan F-76821, France
| | - Marc G J Feuilloley
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France
| | - Nicole Orange
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France
| | - Sylvie Chevalier
- Laboratory of Microbiology Signal and Microenvironment (LMSM) EA 4312, University of Rouen, GRRs SeSa, IRIB, Evreux F-27000, France.
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31
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Ghequire MGK, Garcia-Pino A, Lebbe EKM, Spaepen S, Loris R, De Mot R. Structural determinants for activity and specificity of the bacterial toxin LlpA. PLoS Pathog 2013; 9:e1003199. [PMID: 23468636 PMCID: PMC3585409 DOI: 10.1371/journal.ppat.1003199] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 01/03/2013] [Indexed: 11/21/2022] Open
Abstract
Lectin-like bacteriotoxic proteins, identified in several plant-associated bacteria, are able to selectively kill closely related species, including several phytopathogens, such as Pseudomonas syringae and Xanthomonas species, but so far their mode of action remains unrevealed. The crystal structure of LlpABW, the prototype lectin-like bacteriocin from Pseudomonas putida, reveals an architecture of two monocot mannose-binding lectin (MMBL) domains and a C-terminal β-hairpin extension. The C-terminal MMBL domain (C-domain) adopts a fold very similar to MMBL domains from plant lectins and contains a binding site for mannose and oligomannosides. Mutational analysis indicates that an intact sugar-binding pocket in this domain is crucial for bactericidal activity. The N-terminal MMBL domain (N-domain) adopts the same fold but is structurally more divergent and lacks a functional mannose-binding site. Differential activity of engineered N/C-domain chimers derived from two LlpA homologues with different killing spectra, disclosed that the N-domain determines target specificity. Apparently this bacteriocin is assembled from two structurally similar domains that evolved separately towards dedicated functions in target recognition and bacteriotoxicity. In their natural environments, microorganisms compete for space and nutrients, and a major strategy to assist in niche colonization is the deployment of antagonistic compounds directed at competitors, such as secondary metabolites (antibiotics) and antibacterial peptides or proteins (bacteriocins). The latter selectively kill closely related bacteria, which is also the case for members of the LlpA family. Here, we investigate the structure-function relationship for the prototype LlpABW from a saprophytic plant-associated Pseudomonas whose genus-specific target spectrum includes several phytopathogenic pseudomonads. By determining the 3D structure of this protein, we could assign LlpA to the so-called monocot mannose-binding lectin (MMBL) family, representing its first prokaryotic member, and also add a new type of protective function, as the eukaryotic MMBL members have been linked with antiviral, antifungal, nematicidal or insecticidal activities. For the protein containing two similarly folded domains, we constructed site-specific mutants affected in carbohydrate binding and domain chimers from LlpA homologues to show that mannose-specific sugar binding mediated by one domain is required for activity and that the other domain determines target strain specificity. The strategy that evolved for these bacteriocins is reminiscent of the one used by mammalian bactericidal proteins of the RegIII family that recruited a C-type lectin fold to kill bacteria.
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Affiliation(s)
- Maarten G K Ghequire
- Centre of Microbial and Plant Genetics, University of Leuven, Heverlee-Leuven, Belgium
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