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Structure of the Streptococcal Endopeptidase IdeS, a Novel Cysteine Proteinase with Strict Specificity for IgGStructure of the Streptococcal Endopeptidase IdeS, a Novel Cysteine Proteinase with Strict Specificity for IgG
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedPathogenic bacteria have developed complex and diverse virulence mechanisms that weaken or disable the host immune defense system. IdeS (IgG-degrading enzyme of Streptococcus pyogenes) is a secreted cysteine endopeptidase from the human pathogen S. pyogenes with an extraordinarily high degree of substrate specificity, catalyzing a single proteolytic cleavage at the lower hinge of human IgG. This proteolytic degradation promotes inhibition of opsonophagocytosis and interferes with the killing of group A Streptococcus. We have determined the crystal structure of the catalytically inactive mutant IdeS-C94S by x-ray crystallography at 1.9-A resolution. Despite negligible sequence homology to known proteinases, the core of the structure resembles the canonical papain fold although with major insertions and a distinct substrate-binding site. Therefore IdeS belongs to a unique family within the CA clan of cysteine proteinases. Based on analogy with inhibitor complexes of papain-like proteinases, we propose a model for substrate binding by IdeS. Structure of the streptococcal endopeptidase IdeS, a cysteine proteinase with strict specificity for IgG.,Wenig K, Chatwell L, von Pawel-Rammingen U, Bjorck L, Huber R, Sondermann P Proc Natl Acad Sci U S A. 2004 Dec 14;101(50):17371-6. Epub 2004 Dec 1. PMID:15574492[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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