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Mitrasinovic PM. On the recognition of Yersinia protein tyrosine phosphatase by carboxylic acid derivatives. J Biomol Struct Dyn 2023; 41:1879-1894. [PMID: 35021965 DOI: 10.1080/07391102.2021.2025148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Some members of Yersinia (Y), a genus of bacteria in the family Yersiniaceae, are pathogenic in humans, causing a range of health problems, from gastrointestinal syndromes to the plague. The Y protein tyrosine phosphatase (PTP) YopH is a crucial virulence determinant, considering the vital roles of PTPs in the intracellular signal transduction pathways and cell cycle control. The structural understanding of YopH as a cellular target in pathogenic conditions caused by Y infection is a prerequisite for designing potent and selective YopH inhibitors. Thus, by using molecular docking simulations, the open and closed conformations of the so-called 'WPD loop' (352-Gly-Asn-Trp-Pro-Asp-Gln-Thr-Ala-Val-Ser-361), located nearby the active site (403-Cys-Arg-Ala-Gly-Val-Gly-Arg-Thr-410) in YopH structure, are shown to be relevant for recognition by carboxylic acid derivatives, and the closed conformation is a more preferable receptor in terms of the quantitative correlation with experimental data. In both cases, aurintricarboxylic acid (ATA) has the greatest affinity to YopH. Consequently, a quantum mechanics/molecular mechanics (QM/MM) molecular model is derived to see into the extent of the ATA-induced open-closed conformational change. Active site residues and the WPD loop, as well as ATA are treated using SCC-DFTB-D (QM level), while the rest of the complex is treated using AMBER force field (MM level). The active/inactive functional behavior of YopH is explored by observing the interaction mode of ATA with the wild-type (wt)/Cys403Ser receptor and evaluating the competitive inhibition parameters. Implications of the present study for experimental research are discussed. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Petar M Mitrasinovic
- Center for Biophysical and Chemical Research, Belgrade Institute of Science and Technology, Belgrade, Serbia
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2
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Menegatti ACO. Targeting protein tyrosine phosphatases for the development of antivirulence agents: Yersinia spp. and Mycobacterium tuberculosis as prototypes. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2022; 1870:140782. [PMID: 35470106 DOI: 10.1016/j.bbapap.2022.140782] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 04/15/2022] [Accepted: 04/19/2022] [Indexed: 06/14/2023]
Abstract
Protein phosphorylation mediated by protein kinases and phosphatases has a central regulatory function in many cellular processes in eukaryotes and prokaryotes. As a result, several diseases caused by imbalance in phosphorylation levels are known, especially due to protein tyrosine phosphatases (PTPs) activity, an important family of signaling enzymes. Furthermore, over the last decades several studies have shown the main role of PTPs in pathogenic bacteria: they are associated with growth, cell division, cell wall biosynthesis, biofilm formation, metabolic processes, as well as virulence factor. In this way, PTPs have ascended as targets for antibacterial drug design, particularly in view of the antibiotic resistance in pathogenic bacteria, which demands novel therapeutics strategies. Targeting secreted PTPs is an antivirulence strategy to combat the emergence of antimicrobial resistance (AMR). This review focuses on the recent advances in understanding the role of PTPs and the approaches to target them, with an emphasis in Yersinia spp. and Mycobacterium tuberculosis pathogenesis.
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Affiliation(s)
- Angela Camila Orbem Menegatti
- Departamento de Biologia Molecular, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba, Paraíba, Brazil.
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Role of the Yersinia pseudotuberculosis Virulence Plasmid in Pathogen-Phagocyte Interactions in Mesenteric Lymph Nodes. EcoSal Plus 2021; 9:eESP00142021. [PMID: 34910573 DOI: 10.1128/ecosalplus.esp-0014-2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Yersinia pseudotuberculosis is an Enterobacteriaceae family member that is commonly transmitted by the fecal-oral route to cause infections. From the small intestine, Y. pseudotuberculosis can invade through Peyer's patches and lymph vessels to infect the mesenteric lymph nodes (MLNs). Infection of MLNs by Y. pseudotuberculosis results in the clinical presentation of mesenteric lymphadenitis. MLNs are important for immune responses to intestinal pathogens and microbiota in addition to their clinical relevance to Y. pseudotuberculosis infections. A characteristic of Y. pseudotuberculosis infection in MLNs is the formation of pyogranulomas. Pyogranulomas are composed of neutrophils, inflammatory monocytes, and lymphocytes surrounding extracellular microcolonies of Y. pseudotuberculosis. Key elements of the complex pathogen-host interaction in MLNs have been identified using mouse infection models. Y. pseudotuberculosis requires the virulence plasmid pYV to induce the formation of pyogranulomas in MLNs. The YadA adhesin and the Ysc-Yop type III secretion system (T3SS) are encoded on pYV. YadA mediates bacterial binding to host receptors, which engages the T3SS to preferentially translocate seven Yop effectors into phagocytes. The effectors promote pathogenesis by blocking innate immune defenses such as superoxide production, degranulation, and inflammasome activation, resulting in survival and growth of Y. pseudotuberculosis. On the other hand, certain effectors can trigger immune defenses in phagocytes. For example, YopJ triggers activation of caspase-8 and an apoptotic cell death response in monocytes within pyogranulomas that limits dissemination of Y. pseudotuberculosis from MLNs to the bloodstream. YopE can be processed as an antigen by phagocytes in MLNs, resulting in T and B cell responses to Y. pseudotuberculosis. Immune responses to Y. pseudotuberculosis in MLNs can also be detrimental to the host in the form of chronic lymphadenopathy. This review focuses on interactions between Y. pseudotuberculosis and phagocytes mediated by pYV that concurrently promote pathogenesis and host defense in MLNs. We propose that MLN pyogranulomas are immunological arenas in which opposing pYV-driven forces determine the outcome of infection in favor of the pathogen or host.
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Chu TH, Khairallah C, Shieh J, Cho R, Qiu Z, Zhang Y, Eskiocak O, Thanassi DG, Kaplan MH, Beyaz S, Yang VW, Bliska JB, Sheridan BS. γδ T cell IFNγ production is directly subverted by Yersinia pseudotuberculosis outer protein YopJ in mice and humans. PLoS Pathog 2021; 17:e1010103. [PMID: 34871329 PMCID: PMC8648121 DOI: 10.1371/journal.ppat.1010103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/09/2021] [Indexed: 12/31/2022] Open
Abstract
Yersinia pseudotuberculosis is a foodborne pathogen that subverts immune function by translocation of Yersinia outer protein (Yop) effectors into host cells. As adaptive γδ T cells protect the intestinal mucosa from pathogen invasion, we assessed whether Y. pseudotuberculosis subverts these cells in mice and humans. Tracking Yop translocation revealed that the preferential delivery of Yop effectors directly into murine Vγ4 and human Vδ2+ T cells inhibited anti-microbial IFNγ production. Subversion was mediated by the adhesin YadA, injectisome component YopB, and translocated YopJ effector. A broad anti-pathogen gene signature and STAT4 phosphorylation levels were inhibited by translocated YopJ. Thus, Y. pseudotuberculosis attachment and translocation of YopJ directly into adaptive γδ T cells is a major mechanism of immune subversion in mice and humans. This study uncovered a conserved Y. pseudotuberculosis pathway that subverts adaptive γδ T cell function to promote pathogenicity. Unconventional γδ T cells are a dynamic immune population important for mucosal protection of the intestine against invading pathogens. We determined that the foodborne pathogen Y. pseudotuberculosis preferentially targets an adaptive subset of these cells to subvert immune function. We found that direct injection of Yersinia outer proteins (Yop) into adaptive γδ T cells inhibited their anti-pathogen functions. We screened all Yop effectors and identified YopJ as the sole effector to inhibit adaptive γδ T cell production of IFNγ. We determined that adaptive γδ T cell subversion occurred by limiting activation of the transcription factor STAT4. When we infected mice with Y. pseudotuberculosis expressing an inactive YopJ, this enhanced the adaptive γδ T cell response and led to greater cytokine production from this subset of cells to aid mouse recovery. This mechanism of immune evasion appears conserved in humans as direct injection of Y. pseudotuberculosis YopJ into human γδ T cells inhibited cytokine production. This suggested to us that Y. pseudotuberculosis actively inhibits the adaptive γδ T cell response through YopJ as a mechanism to evade immune surveillance at the site of pathogen invasion.
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Affiliation(s)
- Timothy H. Chu
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Camille Khairallah
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Jason Shieh
- Department of Medicine, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Rhea Cho
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Zhijuan Qiu
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Yue Zhang
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Onur Eskiocak
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, United States of America
| | - David G. Thanassi
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - Mark H. Kaplan
- Department of Microbiology and Immunology, School of Medicine, Indiana University, Indianapolis, Indiana, United States of America
| | - Semir Beyaz
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, United States of America
| | - Vincent W. Yang
- Department of Medicine, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
| | - James B. Bliska
- Department of Microbiology and Immunology, Geisel School of Medicine, Dartmouth College, Dartmouth, New Hampshire, United States of America
| | - Brian S. Sheridan
- Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- Center for Infectious Diseases, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, United States of America
- * E-mail:
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de Souza AC, Mori M, Sens L, Rocha RF, Tizziani T, de Souza LF, Domeneghini Chiaradia-Delatorre L, Botta M, Nunes RJ, Terenzi H, Menegatti AC. A chalcone derivative binds a putative allosteric site of YopH: Inhibition of a virulence factor of Yersinia. Bioorg Med Chem Lett 2020; 30:127350. [DOI: 10.1016/j.bmcl.2020.127350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/08/2020] [Accepted: 06/09/2020] [Indexed: 01/01/2023]
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Srinivasan VB, Rajamohan G. Protein phosphorylation mechanisms: a novel paradigm of antimicrobial resistance in 'critical threat' pathogens. Future Microbiol 2020; 15:837-840. [PMID: 32657616 DOI: 10.2217/fmb-2020-0009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- Vijaya Bharathi Srinivasan
- Council of Scientific & Industrial Research- Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
| | - Govindan Rajamohan
- Council of Scientific & Industrial Research- Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
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7
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Hogan M, Bahta M, Tsuji K, Nguyen TX, Cherry S, Lountos GT, Tropea JE, Zhao BM, Zhao XZ, Waugh DS, Burke TR, Ulrich RG. Targeting Protein-Protein Interactions of Tyrosine Phosphatases with Microarrayed Fragment Libraries Displayed on Phosphopeptide Substrate Scaffolds. ACS COMBINATORIAL SCIENCE 2019; 21:158-170. [PMID: 30629404 PMCID: PMC8132114 DOI: 10.1021/acscombsci.8b00122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Chemical library screening approaches that focus exclusively on catalytic events may overlook unique effects of protein-protein interactions that can be exploited for development of specific inhibitors. Phosphotyrosyl (pTyr) residues embedded in peptide motifs comprise minimal recognition elements that determine the substrate specificity of protein tyrosine phosphatases (PTPases). We incorporated aminooxy-containing amino acid residues into a 7-residue epidermal growth factor receptor (EGFR) derived phosphotyrosine-containing peptide and subjected the peptides to solution-phase oxime diversification by reacting with aldehyde-bearing druglike functionalities. The pTyr residue remained unmodified. The resulting derivatized peptide library was printed in microarrays on nitrocellulose-coated glass surfaces for assessment of PTPase catalytic activity or on gold monolayers for analysis of kinetic interactions by surface plasmon resonance (SPR). Focusing on amino acid positions and chemical features, we first analyzed dephosphorylation of the peptide pTyr residues within the microarrayed library by the human dual-specificity phosphatases (DUSP) DUSP14 and DUSP22, as well as by PTPases from poxviruses (VH1) and Yersinia pestis (YopH). In order to identify the highest affinity oxime motifs, the binding interactions of the most active derivatized phosphopeptides were examined by SPR using noncatalytic PTPase mutants. On the basis of high-affinity oxime fragments identified by the two-step catalytic and SPR-based microarray screens, low-molecular-weight nonphosphate-containing peptides were designed to inhibit PTP catalysis at low micromolar concentrations.
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Affiliation(s)
- Megan Hogan
- Molecular and Translational Sciences Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
| | - Medhanit Bahta
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - Kohei Tsuji
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - Trung X. Nguyen
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - Scott Cherry
- Macromolecular Crystallography Laboratory, National Cancer Institute, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - George T. Lountos
- Macromolecular Crystallography Laboratory, National Cancer Institute, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
- Basic Science Program, Frederick National Laboratory for Cancer Research sponsored by the National Cancer Institute, Frederick, Maryland 21702, United States
| | - Joseph E. Tropea
- Macromolecular Crystallography Laboratory, National Cancer Institute, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - Bryan M. Zhao
- Molecular and Translational Sciences Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
| | - Xue Zhi Zhao
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - David S. Waugh
- Macromolecular Crystallography Laboratory, National Cancer Institute, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - Terrence R. Burke
- Chemical Biology Laboratory, Center for Cancer Research, National Institutes of Health, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| | - Robert G. Ulrich
- Molecular and Translational Sciences Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
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Identification and characterization of a large family of superbinding bacterial SH2 domains. Nat Commun 2018; 9:4549. [PMID: 30382091 PMCID: PMC6208348 DOI: 10.1038/s41467-018-06943-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 10/02/2018] [Indexed: 11/27/2022] Open
Abstract
Src homology 2 (SH2) domains play a critical role in signal transduction in mammalian cells by binding to phosphorylated Tyr (pTyr). Apart from a few isolated cases in viruses, no functional SH2 domain has been identified to date in prokaryotes. Here we identify 93 SH2 domains from Legionella that are distinct in sequence and specificity from mammalian SH2 domains. The bacterial SH2 domains are not only capable of binding proteins or peptides in a Tyr phosphorylation-dependent manner, some bind pTyr itself with micromolar affinities, a property not observed for mammalian SH2 domains. The Legionella SH2 domains feature the SH2 fold and a pTyr-binding pocket, but lack a specificity pocket found in a typical mammalian SH2 domain for recognition of sequences flanking the pTyr residue. Our work expands the boundary of phosphotyrosine signalling to prokaryotes, suggesting that some bacterial effector proteins have acquired pTyr-superbinding characteristics to facilitate bacterium-host interactions. SH2 domains bind to tyrosine-phosphorylated proteins and play crucial roles in signal transduction in mammalian cells. Here, Kaneko et al. identify a large family of SH2 domains in the bacterial pathogen Legionella that bind to mammalian phosphorylated proteins, in some cases with very high affinity.
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Ghattas MA, Raslan N, Sadeq A, Al Sorkhy M, Atatreh N. Druggability analysis and classification of protein tyrosine phosphatase active sites. DRUG DESIGN DEVELOPMENT AND THERAPY 2016; 10:3197-3209. [PMID: 27757011 PMCID: PMC5053377 DOI: 10.2147/dddt.s111443] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Protein tyrosine phosphatases (PTP) play important roles in the pathogenesis of many diseases. The fact that no PTP inhibitors have reached the market so far has raised many questions about their druggability. In this study, the active sites of 17 PTPs were characterized and assessed for its ability to bind drug-like molecules. Consequently, PTPs were classified according to their druggability scores into four main categories. Only four members showed intermediate to very druggable pocket; interestingly, the rest of them exhibited poor druggability. Particularly focusing on PTP1B, we also demonstrated the influence of several factors on the druggability of PTP active site. For instance, the open conformation showed better druggability than the closed conformation, while the tight-bound water molecules appeared to have minimal effect on the PTP1B druggability. Finally, the allosteric site of PTP1B was found to exhibit superior druggability compared to the catalytic pocket. This analysis can prove useful in the discovery of new PTP inhibitors by assisting researchers in predicting hit rates from high throughput or virtual screening and saving unnecessary cost, time, and efforts via prioritizing PTP targets according to their predicted druggability.
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Affiliation(s)
- Mohammad A Ghattas
- College of Pharmacy, Al Ain University of Science and Technology, Al Ain, UAE
| | - Noor Raslan
- College of Pharmacy, Al Ain University of Science and Technology, Al Ain, UAE
| | - Asil Sadeq
- College of Pharmacy, Al Ain University of Science and Technology, Al Ain, UAE
| | - Mohammad Al Sorkhy
- College of Pharmacy, Al Ain University of Science and Technology, Al Ain, UAE
| | - Noor Atatreh
- College of Pharmacy, Al Ain University of Science and Technology, Al Ain, UAE
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Kuban-Jankowska A, Sahu KK, Gorska M, Tuszynski JA, Wozniak M. Chicoric acid binds to two sites and decreases the activity of the YopH bacterial virulence factor. Oncotarget 2016; 7:2229-38. [PMID: 26735581 PMCID: PMC4823031 DOI: 10.18632/oncotarget.6812] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 11/26/2015] [Indexed: 11/25/2022] Open
Abstract
Chicoric acid (CA) is a phenolic compound present in dietary supplements with a large spectrum of biological properties reported ranging from antioxidant, to antiviral, to immunostimulatory properties. Due to the fact that chicoric acid promotes phagocytic activity and was reported as an allosteric inhibitor of the PTP1B phosphatase, we examined the effect of CA on YopH phosphatase from pathogenic bacteria, which block phagocytic processes of a host cell. We performed computational studies of chicoric acid binding to YopH as well as validation experiments with recombinant enzymes. In addition, we performed similar studies for caffeic and chlorogenic acids to compare the results. Docking experiments demonstrated that, from the tested compounds, only CA binds to both catalytic and secondary binding sites of YopH. Our experimental results showed that CA reduces activity of recombinant YopH phosphatase from Yersinia enterocolitica and human CD45 phosphatase. The inhibition caused by CA was irreversible and did not induce oxidation of catalytic cysteine. We proposed that inactivation of YopH induced by CA is involved with allosteric inhibition by interacting with essential regions responsible for ligand binding.
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Affiliation(s)
| | - Kamlesh K. Sahu
- Department of Physics, University of Alberta, Edmonton, Canada
| | - Magdalena Gorska
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Jack A. Tuszynski
- Department of Physics, University of Alberta, Edmonton, Canada
- Division of Experimental Oncology, Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Canada
| | - Michal Wozniak
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
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Van Nhieu GT, Romero S. Common Themes in Cytoskeletal Remodeling by Intracellular Bacterial Effectors. Handb Exp Pharmacol 2016; 235:207-235. [PMID: 27807696 DOI: 10.1007/164_2016_42] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Bacterial pathogens interact with various types of tissues to promote infection. Because it controls the formation of membrane extensions, adhesive processes, or the junction integrity, the actin cytoskeleton is a key target of pathogens during infection. We will highlight common and specific functions of the actin cytoskeleton during bacterial infections, by first reviewing the mechanisms of intracellular motility of invasive Shigella, Listeria, and Rickettsia. Through the models of EPEC/EHEC, Shigella, Salmonella, and Chlamydia spp., we will illustrate various strategies of diversion of actin cytoskeletal processes used by these bacteria to colonize or breach epithelial/endothelial barriers.
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Affiliation(s)
- Guy Tran Van Nhieu
- Equipe Communication Intercellulaire et Infections Microbiennes, Centre de Recherche Interdisciplinaire en Biologie (CIRB), Collège de France, 75005, Paris, France. .,Institut National de la Santé et de la Recherche Médicale U1050, 75005, Paris, France. .,Centre National de la Recherche Scientifique UMR7241, 75005, Paris, France. .,MEMOLIFE Laboratory of Excellence and Paris Science Lettre, 75005, Paris, France.
| | - Stéphane Romero
- Equipe Communication Intercellulaire et Infections Microbiennes, Centre de Recherche Interdisciplinaire en Biologie (CIRB), Collège de France, 75005, Paris, France.,Institut National de la Santé et de la Recherche Médicale U1050, 75005, Paris, France.,Centre National de la Recherche Scientifique UMR7241, 75005, Paris, France.,MEMOLIFE Laboratory of Excellence and Paris Science Lettre, 75005, Paris, France
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12
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Sajid A, Arora G, Singhal A, Kalia VC, Singh Y. Protein Phosphatases of Pathogenic Bacteria: Role in Physiology and Virulence. Annu Rev Microbiol 2015; 69:527-47. [DOI: 10.1146/annurev-micro-020415-111342] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Andaleeb Sajid
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi 110007, India;
| | - Gunjan Arora
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi 110007, India;
| | - Anshika Singhal
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi 110007, India;
| | - Vipin C. Kalia
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi 110007, India;
| | - Yogendra Singh
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi 110007, India;
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13
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Grishin AM, Beyrakhova KA, Cygler M. Structural insight into effector proteins of Gram-negative bacterial pathogens that modulate the phosphoproteome of their host. Protein Sci 2015; 24:604-20. [PMID: 25565677 DOI: 10.1002/pro.2636] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 12/29/2014] [Indexed: 12/16/2022]
Abstract
Invading pathogens manipulate cellular process of the host cell to establish a safe replicative niche. To this end they secrete a spectrum of proteins called effectors that modify cellular environment through a variety of mechanisms. One of the most important mechanisms is the manipulation of cellular signaling through modifications of the cellular phosphoproteome. Phosphorylation/dephosphorylation plays a pivotal role in eukaryotic cell signaling, with ∼ 500 different kinases and ∼ 130 phosphatases in the human genome. Pathogens affect the phosphoproteome either directly through the action of bacterial effectors, and/or indirectly through downstream effects of host proteins modified by the effectors. Here we review the current knowledge of the structure, catalytic mechanism and function of bacterial effectors that modify directly the phosphorylation state of host proteins. These effectors belong to four enzyme classes: kinases, phosphatases, phospholyases and serine/threonine acetylases.
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Affiliation(s)
- Andrey M Grishin
- Department of Biochemistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N 5E5
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14
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Freitas-Mesquita AL, Meyer-Fernandes JR. Ecto-nucleotidases and Ecto-phosphatases from Leishmania and Trypanosoma parasites. Subcell Biochem 2014; 74:217-252. [PMID: 24264248 DOI: 10.1007/978-94-007-7305-9_10] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ecto-enzymes can be defined as membrane-bound proteins that have their active site facing the extracellular millieu. In trypanosomatids, the physiological roles of these enzymes remain to be completed elucidated; however, many important events have already been related to them, such as the survival of parasites during their complex life cycle and the successful establishment of host infection. This chapter focuses on two remarkable classes of ecto-enzymes: ecto-nucleotidases and ecto-phosphatases, summarizing their occurrence and possible physiological roles in Leishmania and Trypanosoma genera. Ecto-nucleotidases are characterized by their ability to hydrolyze extracellular nucleotides, playing an important role in purinergic signaling. By the action of these ecto-enzymes, parasites are capable of modulating the host immune system, which leads to a successful parasite infection. Furthermore, ecto-nucleotidases are also involved in the purine salvage pathway, acting in the generation of nucleosides that are able to cross plasma membrane via specialized transporters. Another important ecto-enzyme present in a vast number of pathogenic organisms is the ecto-phosphatase. These enzymes are able to hydrolyze extracellular phosphorylated substrates, releasing free inorganic phosphate that can be internalized by the cell, crossing the plasma membrane through a Pi-transporter. Ecto-phosphatases are also involved in the invasion and survival of parasite in the host cells. Several alternative functions have been suggested for these enzymes in parasites, such as participation in their proliferation, differentiation, nutrition and protection. In this context, the present chapter provides an overview of recent discoveries related to the occurrence of ecto-nucleotidase and ecto-phosphatase activities in Leishmania and Trypanosoma parasites.
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Paczosa MK, Fisher ML, Maldonado-Arocho FJ, Mecsas J. Yersinia pseudotuberculosis uses Ail and YadA to circumvent neutrophils by directing Yop translocation during lung infection. Cell Microbiol 2013; 16:247-68. [PMID: 24119087 DOI: 10.1111/cmi.12219] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/03/2013] [Accepted: 09/19/2013] [Indexed: 12/14/2022]
Abstract
A Yersinia pseudotuberculosis (Yptb) murine model of lung infection was previously developed using the serotype III IP2666NdeI strain, which robustly colonized lungs but only sporadically disseminated to the spleen and liver. We demonstrate here that a serotype Ib Yptb strain, IP32953, colonizes the lungs at higher levels and disseminates more efficiently to the spleen and liver compared with IP2666NdeI . The role of adhesins was investigated during IP32953 lung infection by constructing isogenic Δail, Δinv, ΔpsaE and ΔyadA mutants. An IP32953ΔailΔyadA mutant initially colonized but failed to persist in the lungs and disseminate to the spleen and liver. Yptb expressing these adhesins selectively bound to and targeted neutrophils for translocation of Yops. This selective targeting was critical for virulence because persistence of the ΔailΔyadA mutant was restored following intranasal infection of neutropenic mice. Furthermore, Ail and YadA prevented killing by complement-mediated mechanisms during dissemination to and/or growth in the spleen and liver, but not in the lungs. Combined, these results demonstratethat Ail and YadA are critical, redundant virulence factors during lung infection, because they thwart neutrophils by directing Yop-translocation specifically into these cells.
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Affiliation(s)
- Michelle K Paczosa
- Graduate Program in Immunology, MERGE-ID Track, Sackler School of Biomedical Sciences, Tufts University, Boston, MA, USA
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16
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Structural basis of eukaryotic cell targeting by type III secretion system (T3SS) effectors. Res Microbiol 2013; 164:605-19. [PMID: 23541478 DOI: 10.1016/j.resmic.2013.03.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 02/27/2013] [Indexed: 02/06/2023]
Abstract
Type III secretion systems (T3SS) are macromolecular complexes that translocate a wide number of effector proteins into eukaryotic host cells. Once within the cytoplasm, many T3SS effectors mimic the structure and/or function of eukaryotic proteins in order to manipulate signaling cascades, and thus play pivotal roles in colonization, invasion, survival and virulence. Structural biology techniques have played key roles in the unraveling of bacterial strategies employed for mimicry and targeting. This review provides an overall view of our current understanding of structure and function of T3SS effectors, as well as of the different classes of eukaryotic proteins that are targeted and the consequences for the infected cell.
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17
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Alicea-Velázquez NL, Jakoncic J, Boggon TJ. Structure-guided studies of the SHP-1/JAK1 interaction provide new insights into phosphatase catalytic domain substrate recognition. J Struct Biol 2013; 181:243-51. [PMID: 23296072 PMCID: PMC3578099 DOI: 10.1016/j.jsb.2012.12.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/06/2012] [Accepted: 12/13/2012] [Indexed: 12/28/2022]
Abstract
SHP-1 (PTPN6) is a member of the SHP sub-family of protein tyrosine phosphatases and plays a critical role in the regulation of the JAK/STAT signaling pathway. Previous studies suggested that SHP-1 contains a PTP1B-like second phosphotyrosine pocket that allows for binding of tandem phosphotyrosine residues, such as those found in the activation loop of JAK kinases. To discover the structural nature of the interaction between SHP-1 and the JAK family member, JAK1, we determined the 1.8Å co-crystal structure of the SHP-1 catalytic domain and a JAK1-derived substrate peptide. This structure reveals electron density for only one bound phosphotyrosine residue. To investigate the role of the predicted second site pocket we determined the structures of SHP-1 in complex with phosphate and sulfate to 1.37Å and 1.7Å, respectively, and performed anomalous scattering experiments for a selenate-soaked crystal. These crystallographic data suggest that SHP-1 does not contain a PTP1B-like second site pocket. This conclusion is further supported by analysis of the relative dephosphorylation and binding affinities of mono- and tandem-phosphorylated peptide substrates. The crystal structures instead indicate that SHP-1 contains an extended C-terminal helix α2' incompatible with the predicted second phosphotyrosine binding site. This study suggests that SHP-1 defines a new category of PTP1B-like protein tyrosine phosphatases with a hindered second phosphotyrosine pocket.
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Affiliation(s)
- Nilda L. Alicea-Velázquez
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520
| | - Jean Jakoncic
- the National Synchrotron Light Source, Brookhaven National Laboratories, Upton, NY 11973, USA
| | - Titus J. Boggon
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520
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18
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Hogan M, Bahta M, Cherry S, Lountos GT, Tropea JE, Zhao BM, Burke TR, Waugh DS, Ulrich RG. Biomolecular Interactions of small-molecule inhibitors affecting the YopH protein tyrosine phosphatase. Chem Biol Drug Des 2013; 81:323-33. [PMID: 23241354 PMCID: PMC3573263 DOI: 10.1111/cbdd.12097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We have developed competitive and direct binding methods to examine small-molecule inhibitors of protein tyrosine phosphatase activity. Focusing on the Yersinia pestis outer protein H, a potent bacterial protein tyrosine phosphatase, we describe how an understanding of the kinetic interactions involving Yersinia pestis outer protein H, peptide substrates, and small-molecule inhibitors of protein tyrosine phosphatase activity can be beneficial for inhibitor screening, and we further translate these results into a microarray assay for high-throughput screening.
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Affiliation(s)
- Megan Hogan
- United States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
| | - Medhanit Bahta
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, United States
| | - Scott Cherry
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick National Lab, Frederick, Maryland 21702, United States
| | - George T. Lountos
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick National Lab, Frederick, Maryland 21702, United States
- Basic Science Program, SAIC-Frederick, Inc., Frederick National Lab, Frederick, Maryland 21702, United States
| | - Joseph E. Tropea
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick National Lab, Frederick, Maryland 21702, United States
| | - Bryan M. Zhao
- United States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
| | - Terrence R. Burke
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, United States
| | - David S. Waugh
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick National Lab, Frederick, Maryland 21702, United States
| | - Robert G. Ulrich
- United States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
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19
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Böhmer F, Szedlacsek S, Tabernero L, Ostman A, den Hertog J. Protein tyrosine phosphatase structure-function relationships in regulation and pathogenesis. FEBS J 2013; 280:413-31. [PMID: 22682070 DOI: 10.1111/j.1742-4658.2012.08655.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Protein phosphorylation on tyrosine residues is tightly controlled by protein tyrosine phosphatases (PTPs) at multiple levels: spatio-temporal expression, subcellular localization and post-translational modification. Structural and functional analysis of the PTP domains has provided insight into catalysis and regulatory mechanisms that control the enzymatic activity. Understanding the molecular basis of PTP regulation is of fundamental importance to dissect the pleiotropic effect of these enzymes in both health and disease. Here, we review recent insights into the regulation of receptor-like PTPs by extracellular ligands and into regulation by reversible oxidation that impairs catalysis directly. The physiological roles of PTPs are essential in homeostasis in eukaryotic cells and pertubation of their functional attributes causes different disease states. As an example, we discuss recent findings indicating how inappropriate oxidation of PTPs in cancer cells may contribute to cell transformation. On the other hand, PTPs from many pathogens are key virulence factors and manipulate signalling pathways in the host cells to promote invasion and survival of the microorganisms. This research area has received relatively little attention but has advanced remarkably. We review the structural features of pathogenic PTPs, their similarities and differences with eukaryotic PTPs, and the possible exploitation of this knowledge for therapeutic intervention.
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Affiliation(s)
- Frank Böhmer
- Center for Molecular Biomedicine, Jena University Hospital, Jena, Germany
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20
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Wu X, Vellaichamy A, Wang D, Zamdborg L, Kelleher NL, Huber SC, Zhao Y. Differential lysine acetylation profiles of Erwinia amylovora strains revealed by proteomics. J Proteomics 2012; 79:60-71. [PMID: 23234799 DOI: 10.1016/j.jprot.2012.12.001] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 11/05/2012] [Accepted: 12/01/2012] [Indexed: 01/01/2023]
Abstract
Protein lysine acetylation (LysAc) has recently been demonstrated to be widespread in E. coli and Salmonella, and to broadly regulate bacterial physiology and metabolism. However, LysAc in plant pathogenic bacteria is largely unknown. Here we first report the lysine acetylome of Erwinia amylovora, an enterobacterium causing serious fire blight disease of apples and pears. Immunoblots using generic anti-lysine acetylation antibodies demonstrated that growth conditions strongly affected the LysAc profiles in E. amylovora. Differential LysAc profiles were also observed for two E. amylovora strains, known to have differential virulence in plants, indicating translational modification of proteins may be important in determining virulence of bacterial strains. Proteomic analysis of LysAc in two E. amylovora strains identified 141 LysAc sites in 96 proteins that function in a wide range of biological pathways. Consistent with previous reports, 44% of the proteins are involved in metabolic processes, including central metabolism, lipopolysaccharide, nucleotide and amino acid metabolism. Interestingly, for the first time, several proteins involved in E. amylovora virulence, including exopolysaccharide amylovoran biosynthesis- and type III secretion-associated proteins, were found to be lysine acetylated, suggesting that LysAc may play a major role in bacterial virulence. Comparative analysis of LysAc sites in E. amylovora and E. coli further revealed the sequence and structural commonality for LysAc in the two organisms. Collectively, these results reinforce the notion that LysAc of proteins is widespread in bacterial metabolism and virulence.
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Affiliation(s)
- Xia Wu
- Department of Plant Biology, University of Illinois, Urbana, IL 61801, USA
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21
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Dean P. Functional domains and motifs of bacterial type III effector proteins and their roles in infection. FEMS Microbiol Rev 2011; 35:1100-25. [PMID: 21517912 DOI: 10.1111/j.1574-6976.2011.00271.x] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
A key feature of the virulence of many bacterial pathogens is the ability to deliver effector proteins into eukaryotic cells via a dedicated type three secretion system (T3SS). Many bacterial pathogens, including species of Chlamydia, Xanthomonas, Pseudomonas, Ralstonia, Shigella, Salmonella, Escherichia and Yersinia, depend on the T3SS to cause disease. T3SS effectors constitute a large and diverse group of virulence proteins that mimic eukaryotic proteins in structure and function. A salient feature of bacterial effectors is their modular architecture, comprising domains or motifs that confer an array of subversive functions within the eukaryotic cell. These domains/motifs therefore represent a fascinating repertoire of molecular determinants with important roles during infection. This review provides a snapshot of our current understanding of bacterial effector domains and motifs where a defined role in infection has been demonstrated.
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Affiliation(s)
- Paul Dean
- Institute of Cell and Molecular Bioscience, Medical School, University of Newcastle, Newcastle Upon Tyne, UK.
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22
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Leone M, Barile E, Dahl R, Pellecchia M. Design and NMR studies of cyclic peptides targeting the N-terminal domain of the protein tyrosine phosphatase YopH. Chem Biol Drug Des 2011; 77:12-9. [PMID: 21118379 PMCID: PMC3149900 DOI: 10.1111/j.1747-0285.2010.01058.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We report on the design and evaluation of novel cyclic peptides targeting the N-terminal domain of the protein tyrosine phosphatase YopH from Yersinia. Cyclic peptides have been designed based on a short sequence from the protein SKAP-HOM [DE(pY)DDPF (pY=phosphotyrosine)], and they all contain the motif DEZXDPfK (where Z is a phosphotyrosine or a non-hydrolyzable phosphotyrosine mimetic, X is an aspartic acid or a leucine and f is a d-phenylalanine). These peptides present a 'head to tail' architecture, enabling cyclization through formation of an amide bond in between the side chains of the first aspartic acid and the lysine residues. Chemical shift perturbation studies have been carried out to monitor the binding of these peptides to the N-terminal domain of YopH. Peptides containing a phosphotyrosine moiety exhibit binding affinities in the low micromolar range; substitution of the phosphotyrosine with one of its non-hydrolyzable derivatives dramatically reduces the binding affinities. These preliminary studies may pave the way for the discovery of more potent and selective peptide-based ligands of the YopH N-terminal domain which could be further investigated for their ability to inhibit Yersiniae infections.
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Affiliation(s)
- Marilisa Leone
- Infectious and Inflammatory Disease Center and Cancer Center, Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Rd, 92037 La Jolla, CA, USA
- Institute of Biostructures and Bioimaging-CNR, Via Mezzocannone 16, 80134 Naples, Italy
| | - Elisa Barile
- Infectious and Inflammatory Disease Center and Cancer Center, Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Rd, 92037 La Jolla, CA, USA
| | - Russell Dahl
- Infectious and Inflammatory Disease Center and Cancer Center, Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Rd, 92037 La Jolla, CA, USA
| | - Maurizio Pellecchia
- Infectious and Inflammatory Disease Center and Cancer Center, Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Rd, 92037 La Jolla, CA, USA
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23
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Davis AJ, Díaz DADJ, Mecsas J. A dominant-negative needle mutant blocks type III secretion of early but not late substrates in Yersinia. Mol Microbiol 2010; 76:236-59. [PMID: 20199604 DOI: 10.1111/j.1365-2958.2010.07096.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Yersinia pseudotuberculosis uses a type III secretion system (T3SS) to deliver effectors into host cells. A key component of the T3SS is the needle, which is a hollow tube on the bacterial surface through which effectors are secreted, composed of the YscF protein. To study needle assembly, we performed a screen for dominant-negative yscF alleles that prevented effector secretion in the presence of wild-type (WT) YscF. One allele, yscF-L54V, prevents WT YscF secretion and needle assembly, although purified YscF-L54V polymerizes in vitro. YscF-L54V binds to its chaperones YscE and YscG, and the YscF-L54V-EG complex targets to the T3SS ATPase, YscN. We propose that YscF-L54V stalls at a binding site in the needle assembly pathway following its release from the chaperones, which blocks the secretion of WT YscF and other early substrates required for building a needle. Interestingly, YscF-L54V does not affect the activity of pre-assembled actively secreting machines, indicating that a factor and/or binding site required for YscF secretion is absent from T3SS machines already engaged in effector secretion. Thus, substrate switching may involve the removal of an early substrate-specific binding site as a mechanism to exclude early substrates from Yop-secreting machines.
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Affiliation(s)
- Alison J Davis
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA 02111, USA.
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24
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de la Puerta ML, Trinidad AG, Rodríguez MDC, Bogetz J, Sánchez Crespo M, Mustelin T, Alonso A, Bayón Y. Characterization of new substrates targeted by Yersinia tyrosine phosphatase YopH. PLoS One 2009; 4:e4431. [PMID: 19221593 PMCID: PMC2637541 DOI: 10.1371/journal.pone.0004431] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Accepted: 12/17/2008] [Indexed: 12/24/2022] Open
Abstract
YopH is an exceptionally active tyrosine phosphatase that is essential for virulence of Yersinia pestis, the bacterium causing plague. YopH breaks down signal transduction mechanisms in immune cells and inhibits the immune response. Only a few substrates for YopH have been characterized so far, for instance p130Cas and Fyb, but in view of YopH potency and the great number of proteins involved in signalling pathways it is quite likely that more proteins are substrates of this phosphatase. In this respect, we show here YopH interaction with several proteins not shown before, such as Gab1, Gab2, p85, and Vav and analyse the domains of YopH involved in these interactions. Furthermore, we show that Gab1, Gab2 and Vav are not dephosphorylated by YopH, in contrast to Fyb, Lck, or p85, which are readily dephosphorylated by the phosphatase. These data suggests that YopH might exert its actions by interacting with adaptors involved in signal transduction pathways, what allows the phosphatase to reach and dephosphorylate its susbstrates.
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Affiliation(s)
| | - Antonio G. Trinidad
- Instituto de Biología y Genética Molecular, CSIC-Universidad de Valladolid, Valladolid, Spain
| | | | - Jori Bogetz
- Program of Inflammation, Inflammatory and Infectious Disease Center, and Program of Signal Transduction, Burnham Institute for Medical Research, La Jolla, California, United States of America
| | - Mariano Sánchez Crespo
- Instituto de Biología y Genética Molecular, CSIC-Universidad de Valladolid, Valladolid, Spain
| | - Tomas Mustelin
- Program of Inflammation, Inflammatory and Infectious Disease Center, and Program of Signal Transduction, Burnham Institute for Medical Research, La Jolla, California, United States of America
| | - Andrés Alonso
- Instituto de Biología y Genética Molecular, CSIC-Universidad de Valladolid, Valladolid, Spain
| | - Yolanda Bayón
- Instituto de Biología y Genética Molecular, CSIC-Universidad de Valladolid, Valladolid, Spain
- * E-mail:
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25
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Critton DA, Tortajada A, Stetson G, Peti W, Page R. Structural basis of substrate recognition by hematopoietic tyrosine phosphatase. Biochemistry 2009; 47:13336-45. [PMID: 19053285 DOI: 10.1021/bi801724n] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hematopoietic tyrosine phosphatase (HePTP) is one of three members of the kinase interaction motif (KIM) phosphatase family which also includes STEP and PCPTP1. The KIM-PTPs are characterized by a 15 residue sequence, the KIM, which confers specific high-affinity binding to their only known substrates, the MAP kinases Erk and p38, an interaction which is critical for their ability to regulate processes such as T cell differentiation (HePTP) and neuronal signaling (STEP). The KIM-PTPs are also characterized by a unique set of residues in their PTP substrate binding loops, where 4 of the 13 residues are differentially conserved among the KIM-PTPs as compared to more than 30 other class I PTPs. One of these residues, T106 in HePTP, is either an aspartate or asparagine in nearly every other PTP. Using multiple techniques, we investigate the role of these KIM-PTP specific residues in order to elucidate the molecular basis of substrate recognition by HePTP. First, we used NMR spectroscopy to show that Erk2-derived peptides interact specifically with HePTP at the active site. Next, to reveal the molecular details of this interaction, we solved the high-resolution three-dimensional structures of two distinct HePTP-Erk2 peptide complexes. Strikingly, we were only able to obtain crystals of these transient complexes using a KIM-PTP specific substrate-trapping mutant, in which the KIM-PTP specific residue T106 was mutated to an aspartic acid (T106D). The introduced aspartate side chain facilitates the coordination of the bound peptides, thereby stabilizing the active dephosphorylation complex. These structures establish the essential role of HePTP T106 in restricting HePTP specificity to only those substrates which are able to interact with KIM-PTPs via the KIM (e.g., Erk2, p38). Finally, we describe how this interaction of the KIM is sufficient for overcoming the otherwise weak interaction at the active site of KIM-PTPs.
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Affiliation(s)
- David A Critton
- Department of Molecular Biology, Brown University, Providence, Rhode Island 02912, USA
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26
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Chiaradia LD, Mascarello A, Purificação M, Vernal J, Cordeiro MNS, Zenteno ME, Villarino A, Nunes RJ, Yunes RA, Terenzi H. Synthetic chalcones as efficient inhibitors of Mycobacterium tuberculosis protein tyrosine phosphatase PtpA. Bioorg Med Chem Lett 2008; 18:6227-30. [DOI: 10.1016/j.bmcl.2008.09.105] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Revised: 09/25/2008] [Accepted: 09/29/2008] [Indexed: 01/30/2023]
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27
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Zhang Y, Murtha J, Roberts MA, Siegel RM, Bliska JB. Type III secretion decreases bacterial and host survival following phagocytosis of Yersinia pseudotuberculosis by macrophages. Infect Immun 2008; 76:4299-310. [PMID: 18591234 PMCID: PMC2519449 DOI: 10.1128/iai.00183-08] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2008] [Revised: 03/26/2008] [Accepted: 06/23/2008] [Indexed: 12/24/2022] Open
Abstract
Yersinia pseudotuberculosis uses a plasmid (pYV)-encoded type III secretion system (T3SS) to translocate a set of effectors called Yops into infected host cells. YopJ functions to induce apoptosis, and YopT, YopE, and YopH act to antagonize phagocytosis in macrophages. Because Yops do not completely block phagocytosis and Y. pseudotuberculosis can replicate in macrophages, it is important to determine if the T3SS modulates host responses to intracellular bacteria. Isogenic pYV-cured, pYV(+) wild-type, and yop mutant Y. pseudotuberculosis strains were allowed to infect bone marrow-derived murine macrophages at a low multiplicity of infection under conditions in which the survival of extracellular bacteria was prevented. Phagocytosis, the intracellular survival of the bacteria, and the apoptosis of the infected macrophages were analyzed. Forty percent of cell-associated wild-type bacteria were intracellular after a 20-min infection, allowing the study of the macrophage response to internalized pYV(+) Y. pseudotuberculosis. Interestingly, macrophages restricted survival of pYV(+) but not pYV-cured or DeltayopB Y. pseudotuberculosis within phagosomes: only a small fraction of the pYV(+) bacteria internalized replicated by 24 h. In addition, approximately 20% of macrophages infected with wild-type pYV(+) Y. pseudotuberculosis died of apoptosis after 20 h. Analysis of yop mutants expressing catalytically inactive effectors revealed that YopJ was important for apoptosis, while a role for YopE, YopH, and YopT in modulating macrophage responses to intracellular bacteria could not be identified. Apoptosis was reduced in Toll-like receptor 4-deficient macrophages, indicating that cell death required signaling through this receptor. Treatment of macrophages harboring intracellular pYV(+) Y. pseudotuberculosis with chloramphenicol reduced apoptosis, indicating that the de novo bacterial protein synthesis was necessary for cell death. Our finding that the presence of a functional T3SS impacts the survival of both bacterium and host following phagocytosis of Y. pseudotuberculosis suggests new roles for the T3SS in Yersinia pathogenesis.
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Affiliation(s)
- Yue Zhang
- Department of Molecular Genetics and Microbiology, Center for Infectious Diseases, SUNY Stony Brook, Stony Brook, New York 11794-5222, USA.
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28
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Tabernero L, Aricescu AR, Jones EY, Szedlacsek SE. Protein tyrosine phosphatases: structure-function relationships. FEBS J 2008; 275:867-82. [PMID: 18298793 DOI: 10.1111/j.1742-4658.2008.06251.x] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Structural analysis of protein tyrosine phosphatases (PTPs) has expanded considerably in the last several years, producing more than 200 structures in this class of enzymes (from 35 different proteins and their complexes with ligands). The small-medium size of the catalytic domain of approximately 280 residues plus a very compact fold makes it amenable to cloning and overexpression in bacterial systems thus facilitating crystallographic analysis. The low molecular weight PTPs being even smaller, approximately 150 residues, are also perfect targets for NMR analysis. The availability of different structures and complexes of PTPs with substrates and inhibitors has provided a wealth of information with profound effects in the way we understand their biological functions. Developments in mammalian expression technology recently led to the first crystal structure of a receptor-like PTP extracellular region. Altogether, the PTP structural work significantly advanced our knowledge regarding the architecture, regulation and substrate specificity of these enzymes. In this review, we compile the most prominent structural traits that characterize PTPs and their complexes with ligands. We discuss how the data can be used to design further functional experiments and as a basis for drug design given that many PTPs are now considered strategic therapeutic targets for human diseases such as diabetes and cancer.
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29
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Shao F. Biochemical functions of Yersinia type III effectors. Curr Opin Microbiol 2008; 11:21-9. [PMID: 18299249 DOI: 10.1016/j.mib.2008.01.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2007] [Revised: 01/11/2008] [Accepted: 01/18/2008] [Indexed: 01/09/2023]
Abstract
Yersinia uses a type III secretion system (TTSS) to deliver six effector proteins into host cells. These six proteins harbor distinct activities that are mimicries of host functions but often have acquired unique biochemical features. The host targets for these effectors appear to be limited to a few key signaling components such as G proteins and kinases, whereas their models of action are diverse and sophisticated. The functions of these effectors are to subvert the host immune defense response, including alterations of the cytoskeleton structure, inhibition of phagocytic clearance, blockage of cytokine production, and induction of apoptosis. These effectors also interfere with communications between the innate and the adaptive immune response, thus aiding the establishment of a systemic infection.
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Affiliation(s)
- Feng Shao
- National Institute of Biological Sciences, Zhongguancun Life Science Park, Beijing, China.
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30
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Auerbuch V, Isberg RR. Growth of Yersinia pseudotuberculosis in mice occurs independently of Toll-like receptor 2 expression and induction of interleukin-10. Infect Immun 2007; 75:3561-70. [PMID: 17420232 PMCID: PMC1932928 DOI: 10.1128/iai.01497-06] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Pathogenic Yersinia translocates effector proteins into target cells via a type III secretion system (TTSS), modulating the host immune response. A component of the TTSS translocon, LcrV, has been implicated in preventing inflammation through Toll-like receptor 2 (TLR2) by inducing expression of the anti-inflammatory cytokine interleukin-10 (IL-10). TLR2(-/-) mice were reported to be less susceptible to the enteropathogen Yersinia enterocolitica. To determine whether TLR2 also plays a role in recognition of the enteropathogen Yersinia pseudotuberculosis and whether this results in an immune response that is detrimental to the host, we evaluated the macrophage cytokine response to live Y. pseudotuberculosis and analyzed the susceptibility of TLR2(-/-) mice to enteropathogenic Yersinia. We find that Yersinia induction of macrophage IL-10 occurs independently of TLR2 and LcrV and is blocked by the TTSS. In particular, the TTSS effector protein YopJ, which inhibits production of the inflammatory cytokine tumor necrosis factor alpha (TNF-alpha), also inhibits IL-10 expression. Consistent with these results, IL-10 is undetectable in Y. pseudotuberculosis-infected mouse tissues until advanced stages of infection. In addition, we find that TLR2(-/-) mice (derived independently from those used in previous studies) do not display altered susceptibility to enteropathogenic Yersinia compared to wild-type mice. Tissue levels of IL-10, as well as the inflammatory cytokines TNF-alpha, IL-6, and gamma interferon and the chemokine macrophage chemotactic protein 1, are similar in TLR2(+/+) and TLR2(-/-) mice during enteropathogenic Yersinia infection. Therefore, the absence of TLR2 alone does not affect the cytokine response of macrophages to, or the in vivo growth and survival of, enteropathogenic Yersinia.
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Affiliation(s)
- Victoria Auerbuch
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, 150 Harrison Avenue, Boston, MA 02111, USA
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Fisher ML, Castillo C, Mecsas J. Intranasal inoculation of mice with Yersinia pseudotuberculosis causes a lethal lung infection that is dependent on Yersinia outer proteins and PhoP. Infect Immun 2006; 75:429-42. [PMID: 17074849 PMCID: PMC1828392 DOI: 10.1128/iai.01287-06] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Yersinia pseudotuberculosis infects many mammals and birds including humans, livestock, and wild rodents and can be recovered from the lungs of infected animals. To determine the Y. pseudotuberculosis factors important for growth during lung infection, we developed an intranasal model of infection in mice. Following intranasal inoculation, we monitored both bacterial growth in lungs and dissemination to systemic tissues. Intranasal inoculation with as few as 18 CFU of Y. pseudotuberculosis caused a lethal lung infection in some mice. Over the course of 7 days, wild-type Y. pseudotuberculosis replicated to nearly 1 x 10(8) CFU/g of lung in BALB/c mice, induced histopathology in lungs consistent with pneumonia, but disseminated sporadically to other tissues. In contrast, a Delta yopB deletion strain was attenuated in this model, indicating that translocation of Yersinia outer proteins (Yops) is essential for virulence. Additionally, a Delta yopH null mutant failed to grow to wild-type levels by 4 days postintranasal inoculation, but deletions of any other single effector YOP did not attenuate lung colonization 4 days postinfection. Strains with deletions in yopH and any one of the other known effector yop genes were more attenuated that the Delta yopH strain, indicating a unique role for yopH in lungs. In summary, we have characterized the progression of a lung infection with an enteric Yersinia pathogen and shown that YopB and YopH are important in lung colonization and dissemination. Furthermore, this lung infection model with Y. pseudotuberculosis can be used to test potential therapeutics against Yersinia and other gram-negative infections in lungs.
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Affiliation(s)
- Michael L Fisher
- Department of Microbiology, 136 Harrison Ave., Tufts University, Boston, MA 02111, USA
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Davis AJ, Mecsas J. Mutations in the Yersinia pseudotuberculosis type III secretion system needle protein, YscF, that specifically abrogate effector translocation into host cells. J Bacteriol 2006; 189:83-97. [PMID: 17071752 PMCID: PMC1797200 DOI: 10.1128/jb.01396-06] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The trafficking of effectors, termed Yops, from Yersinia spp. into host cells is a multistep process that requires the type III secretion system (TTSS). The TTSS has three main structural parts: a base, a needle, and a translocon, which work together to ensure the polarized movement of Yops directly from the bacterial cytosol into the host cell cytosol. To understand the interactions that take place at the interface between the tip of the TTSS needle and the translocon, we developed a screen to identify mutations in the needle protein YscF that separated its function in secretion from its role in translocation. We identified 25 translocation-defective (TD) yscF mutants, which fall into five phenotypic classes. Some classes exhibit aberrant needle structure and/or reduced levels of Yop secretion, consistent with known functions for YscF. Strikingly, two yscF TD classes formed needles and secreted Yops normally but displayed distinct translocation defects. Class I yscF TD mutants showed diminished pore formation, suggesting incomplete pore insertion and/or assembly. Class II yscF TD mutants formed pores but showed nonpolar translocation, suggesting unstable needle-translocon interactions. These results indicate that YscF functions in Yop secretion and translocation can be genetically separated. Furthermore, the identification of YscF residues that are required for the assembly of the translocon and/or productive interactions with the translocon has allowed us to initiate the mapping of the needle-translocon interface.
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Affiliation(s)
- Alison J Davis
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, 136 Harrison Ave., Boston, MA 02111, USA
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Miura M, Terajima J, Izumiya H, Mitobe J, Komano T, Watanabe H. OspE2 of Shigella sonnei is required for the maintenance of cell architecture of bacterium-infected cells. Infect Immun 2006; 74:2587-95. [PMID: 16622194 PMCID: PMC1459745 DOI: 10.1128/iai.74.5.2587-2595.2006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The OspE2 product of Shigella spp., the expression of which is regulated by the mxiE gene, is secreted through a type III secretion system into host cells. We investigated the function of OspE2 of Shigella sonnei by using cultured epithelial cells. Cells invaded by an ospE2 deletion mutant altered their morphology into the rounding shape, which was not due to cell death, whereas cells invaded by the wild-type strain kept their cell shape intact. The ospE2 mutation did not affect initial cell entry and multiplication in cells, but the mutant formed smaller-than-normal plaques on cell monolayers, indicating a deficiency in cell-to-cell spread by the bacteria. An mxiE deletion mutant also showed changes in cell morphology and deficiency in bacterial spread to adjacent cells. In cells invaded by the ospE2 mutant, disturbance of actin stress fibers was prominent at 3 h after invasion. Analysis of OspE2 localization indicated that the OspE2 protein accumulated on focal contact-like structures in the infected host cells. These results suggest that colocalization of the OspE2 protein in the focal contacts of infected cells may function to maintain an intact cell morphology. The morphological change induced by invasion of the ospE2 mutant may affect secondary bacterial transmission.
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Affiliation(s)
- Masashi Miura
- Department of Bacteriology, National Institute of Infectious Diseases, Shinjuku, Tokyo 162-8640, Japan
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Abstract
The bacterial protein tyrosine phosphatase YopH is an essential virulence determinant in Yersinia spp., causing gastrointestinal diseases and the plague. Like eukaryotic PTPases, YopH catalyzes the hydrolysis of the phosphate moiety of phosphotyrosine within a highly conserved binding pocket, which is also characterized by the closure of the so-called "WPD loop" upon ligand binding. In this study, we investigate the conformational changes and dynamics of the WPD loop by molecular dynamics simulations. Consistent with experimental observations, our simulations show that the WPD loop of YopH is intrinsically flexible and fluctuates between the open and closed conformation with a frequency of approximately 4 ns for the apo, native protein. The region of helix alpha4 spanning loop 384-392, which has been revealed experimentally as a second substrate-binding site in YopH, is found to be highly associated with the WPD loop, stabilizing it in the closed, active conformation, and providing a structural basis for the cooperation of the second-substrate binding site in substrate recognition. Loop L4 (residues 323-327) is shown to be involved in a parallel, correlated motion mode with the WPD loop that contributes the stabilization of a more extended open conformation. In addition, we have simulated the loop reopening in the ligand-bound protein complex by applying the locally enhanced sampling method. Finally, the dynamic behavior of the WPD loop for the C403S mutant differs from the wild-type YopH remarkably. These results shed light on the role of the WPD loop in PTPase-mediated catalysis, and are useful in structure-based design for novel, selective YopH inhibitors as antibacterial drugs.
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Affiliation(s)
- Xin Hu
- Laboratory of Structural Microbiology, The Rockefeller University, New York, New York 10021, USA
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Abstract
Bacterial pathogens achieve the internalization of a multitude of virulence factors into eukaryotic cells. Some secrete extracellular toxins which bring about their own entry, usually by hijacking cell surface receptors and endocytic pathways. Others possess specialized secretion and translocation systems to directly inject bacterial proteins into the host cytosol. Recent advances in the structural biology of these virulence factors has begun to reveal at the molecular level how these bacterial proteins are delivered and modulate host activities ranging from cytoskeletal structure to cell cycle progression.
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Affiliation(s)
- C Erec Stebbins
- Laboratory of Structural Microbiology, Rockefeller University, New York, NY 10021, USA.
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Yuan M, Deleuil F, Fällman M. Interaction between the Yersinia Tyrosine Phosphatase YopH and Its Macrophage Substrate, Fyn-Binding Protein, Fyb. J Mol Microbiol Biotechnol 2006; 9:214-23. [PMID: 16415594 DOI: 10.1159/000089649] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Pathogenic Yersinia species can evade phagocytosis by injecting virulence effectors that interfere with the phagocytic machinery of host cells. One of these virulence effectors is the protein tyrosine phosphatase YopH. Through its enzymatic activity, YopH interferes with the initial phagocytic process by affecting signalling for cytoskeletal rearrangements. Fyb (Fyn-binding protein), which is an immune cell-specific adaptor protein, has been identified as a substrate of YopH in macrophages. In this study, the interaction between YopH and Fyb is studied. We show that YopH binds to Fyb via different regions in both phosphotyrosine-dependent and phosphotyrosine-independent ways. The phosphotyrosine substrate binding N-terminal part (1-130) of YopH as well as the C-terminal catalytic region binds to Fyb in a phosphotyrosine-dependent manner. We also show that a central part of YopH (130-260) interacts with the Fyb C-terminus (548-783) in a phosphotyrosine-independent manner. Further, we demonstrate that the N-terminal binding region of YopH is important for YopH-mediated functions on macrophages such as dephosphorylation of Fyb, blockage of phagocytosis, and cytotoxic effects.
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Affiliation(s)
- Ming Yuan
- Department of Molecular Biology, Umeå University, Umeå, Sweden
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Viboud GI, Bliska JB. Yersinia outer proteins: role in modulation of host cell signaling responses and pathogenesis. Annu Rev Microbiol 2006; 59:69-89. [PMID: 15847602 DOI: 10.1146/annurev.micro.59.030804.121320] [Citation(s) in RCA: 447] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A type III secretion system (TTSS) is encoded on a virulence plasmid that is common to three pathogenic Yersinia species: Y. enterocolitica, Y. pseudotuberculosis, and Y. pestis. Pathogenic Yersinia species require this TTSS to survive and replicate within lymphoid tissues of their animal or human hosts. A set of pathogenicity factors, including those known as Yersinia outer proteins (Yops), is exported by this system upon bacterial infection of host cells. Two translocator Yops (YopB and YopD) insert into the host plasma membrane and function to transport six effector Yops (YopO, YopH, YopM, YopT, YopJ, and YopE) into the cytosol of the host cell. Effector Yops function to counteract multiple signaling responses in the infected host cell. The signaling responses counteracted by Yops are initiated by phagocytic receptors, Toll-like receptors, translocator Yops, and additional mechanisms. Innate and adaptive immune responses are thwarted as a consequence of Yop activities. A biochemical function for each effector Yop has been established, and the importance of these proteins for the pathogenesis process is being elucidated. This review focuses on the biochemical functions of Yops, the signaling pathways they modulate, and the role of these proteins in Yersinia virulence.
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Affiliation(s)
- Gloria I Viboud
- Department of Molecular Genetics and Microbiology, Center for Infectious Diseases, SUNY Stony Brook, Stony Brook, New York 11794-5222, USA.
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Johnson S, Deane JE, Lea SM. The type III needle and the damage done. Curr Opin Struct Biol 2005; 15:700-7. [PMID: 16263265 DOI: 10.1016/j.sbi.2005.10.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2005] [Revised: 09/14/2005] [Accepted: 10/20/2005] [Indexed: 12/30/2022]
Abstract
Many Gram-negative pathogens translocate virulence proteins directly into host cells using a type III secretion system. This complex secretion machinery is composed of approximately 25 different proteins that assemble to span both bacterial membranes, and contact the host cell to form a direct channel between the bacterial and host cell cytoplasms. Assembly of the system and efficient secretion of virulence proteins through this apparatus require specific chaperones. Although the machinery is morphologically conserved among all bacteria, the secreted proteins vary widely and are responsible for the range of diseases caused by bacterial pathogens. Recent structures have given insights into important chaperone and effector proteins, as well as revealing the first atomic structures of portions of the secretion machinery itself.
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Affiliation(s)
- Steven Johnson
- Laboratory of Molecular Biophysics, Department of Biochemistry, South Parks Road, Oxford OX1 3QU, UK
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