1dki
From Proteopedia
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'''CRYSTAL STRUCTURE OF THE ZYMOGEN FORM OF STREPTOCOCCAL PYROGENIC EXOTOXIN B ACTIVE SITE (C47S) MUTANT''' | '''CRYSTAL STRUCTURE OF THE ZYMOGEN FORM OF STREPTOCOCCAL PYROGENIC EXOTOXIN B ACTIVE SITE (C47S) MUTANT''' | ||
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[[Category: McSweeney, S.]] | [[Category: McSweeney, S.]] | ||
[[Category: Musser, J M.]] | [[Category: Musser, J M.]] | ||
| - | [[Category: | + | [[Category: Cysteine protease]] |
| - | [[Category: | + | [[Category: Papain-like]] |
| - | [[Category: | + | [[Category: Zymogen]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:57:22 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 10:57, 2 May 2008
CRYSTAL STRUCTURE OF THE ZYMOGEN FORM OF STREPTOCOCCAL PYROGENIC EXOTOXIN B ACTIVE SITE (C47S) MUTANT
Overview
Pathogenic bacteria secrete protein toxins that weaken or disable their host, and thereby act as virulence factors. We have determined the crystal structure of streptococcal pyrogenic exotoxin B (SpeB), a cysteine protease that is a major virulence factor of the human pathogen Streptococcus pyogenes and participates in invasive disease episodes, including necrotizing fasciitis. The structure, determined for the 40-kDa precursor form of SpeB at 1.6-A resolution, reveals that the protein is a distant homologue of the papain superfamily that includes the mammalian cathepsins B, K, L, and S. Despite negligible sequence identity, the protease portion has the canonical papain fold, albeit with major loop insertions and deletions. The catalytic site differs from most other cysteine proteases in that it lacks the Asn residue of the Cys-His-Asn triad. The prosegment has a unique fold and inactivation mechanism that involves displacement of the catalytically essential His residue by a loop inserted into the active site. The structure also reveals the surface location of an integrin-binding Arg-Gly-Asp (RGD) motif that is a feature unique to SpeB among cysteine proteases and is linked to the pathogenesis of the most invasive strains of S. pyogenes.
About this Structure
1DKI is a Single protein structure of sequence from Streptococcus pyogenes. Full crystallographic information is available from OCA.
Reference
Crystal structure of the zymogen form of the group A Streptococcus virulence factor SpeB: an integrin-binding cysteine protease., Kagawa TF, Cooney JC, Baker HM, McSweeney S, Liu M, Gubba S, Musser JM, Baker EN, Proc Natl Acad Sci U S A. 2000 Feb 29;97(5):2235-40. PMID:10681429 Page seeded by OCA on Fri May 2 13:57:22 2008
