6ov2
From Proteopedia
Crystal structure of human claudin-9 in complex with Clostridium perfringens entertoxin C-terminal domain in closed form
Structural highlights
FunctionCLD9_HUMAN Plays a major role in tight junction-specific obliteration of the intercellular space, through calcium-independent cell-adhesion activity. (Microbial infection) Acts as a receptor for hepatitis C virus (HCV) entry into hepatic cells.[1] [2] Publication Abstract from PubMedThe human pathogenic bacterium Clostridium perfringens secretes an enterotoxin (CpE) that targets claudins through its C-terminal receptor-binding domain (cCpE). Isoform-specific binding by CpE causes dissociation of claudins and tight junctions (TJs), resulting in cytotoxicity and breakdown of the gut epithelial barrier. Here, we present crystal structures of human claudin-9 (hCLDN-9) in complex with cCpE at 3.2 and 3.3 A. We show that hCLDN-9 is a high-affinity CpE receptor and that hCLDN-9-expressing cells undergo cell death when treated with CpE but not cCpE, which lacks its cytotoxic domain. Structures reveal cCpE-induced alterations to 2 epitopes known to enable claudin self-assembly and expose high-affinity interactions between hCLDN-9 and cCpE that explain isoform-specific recognition. These findings elucidate the molecular bases for hCLDN-9 selective ion permeability and binding by CpE, and provide mechanisms for how CpE disrupts gut homeostasis by dissociating claudins and TJs to affect epithelial adhesion and intercellular transport. Claudin-9 structures reveal mechanism for toxin-induced gut barrier breakdown.,Vecchio AJ, Stroud RM Proc Natl Acad Sci U S A. 2019 Sep 3;116(36):17817-17824. doi:, 10.1073/pnas.1908929116. Epub 2019 Aug 21. PMID:31434788[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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