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- W2073592717 abstract "Pore-forming toxins (PFTs) are potent cytolytic agents secreted by pathogenic bacteria that protect microbes against the cell-mediated immune system (by targeting phagocytic cells), disrupt epithelial barriers, and liberate materials necessary to sustain growth and colonization. Produced by gram-positive and gram-negative bacteria alike, PFTs are released as water-soluble monomeric or dimeric species, bind specifically to target membranes, and assemble transmembrane channels leading to cell damage and/or lysis. Structural and biophysical analyses of individual steps in the assembly pathway are essential to fully understanding the dynamic process of channel formation. To work toward this goal, we solved by X-ray diffraction the 2.9-Å structure of the 450-kDa heptameric Vibrio cholerae cytolysin (VCC) toxin purified and crystallized in the presence of detergent. This structure, together with our previously determined 2.3-Å structure of the VCC water-soluble monomer, reveals in detail the architectural changes that occur within the channel region and accessory lectin domains during pore formation including substantial rearrangements of hydrogen-bonding networks in the pore-forming amphipathic loops. Interestingly, a ring of tryptophan residues forms the narrowest constriction in the transmembrane channel reminiscent of the phenylalanine clamp identified in anthrax protective antigen [Krantz BA, et al. (2005) Science 309:777-781]. Our work provides an example of a β-barrel PFT (β-PFT) for which soluble and assembled structures are available at high-resolution, providing a template for investigating intermediate steps in assembly." @default.
- W2073592717 created "2016-06-24" @default.
- W2073592717 creator A5009682871 @default.
- W2073592717 creator A5035886269 @default.
- W2073592717 date "2011-04-18" @default.
- W2073592717 modified "2023-10-01" @default.
- W2073592717 title "Crystal structure of the <i>Vibrio cholerae</i> cytolysin heptamer reveals common features among disparate pore-forming toxins" @default.
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- W2073592717 doi "https://doi.org/10.1073/pnas.1017442108" @default.
- W2073592717 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3088620" @default.
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