1ty0

Crystal structure of the streptococcal pyrogenic exotoxin J (SPE-J)Crystal structure of the streptococcal pyrogenic exotoxin J (SPE-J)

Structural highlights 1ty0 is a 3 chain structure with sequence from "micrococcus_scarlatinae"_klein_1884 "micrococcus scarlatinae" klein 1884. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1ty2 Gene: spe-j ("Micrococcus scarlatinae" Klein 1884) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The protein toxins known as superantigens (SAgs), which are expressed primarily by the pathogenic bacteria Staphylococcus aureus and Streptococcus pyogenes, are highly potent immunotoxins with the ability to cause serious human disease. These SAgs share a conserved fold but quite varied activities. In addition to their common role of cross-linking T-cell receptors (TCRs) and major histocompatibility complex class II (MHC-II) molecules, some SAgs can cross-link MHC-II, using diverse mechanisms. The crystal structure of the streptococcal superantigen streptococcal pyrogenic exotoxin J (SPE-J) has been solved at 1.75 A resolution (R = 0.209, R(free) = 0.240), both with and without bound Zn(2+). The structure displays the canonical two-domain SAg fold and a zinc-binding site that is shared by a subset of other SAgs. Most importantly, in concentrated solution and in the crystal, SPE-J forms dimers. These dimers, which are present in two different crystal environments, form via the same face that is used for TCR binding in other SAgs. Site-directed mutagenesis shows that this face is also used for TCR binding SPE-J. We infer that SPE-J cross-links TCR and MHC-II as a monomer but that dimers may form on the antigen-presenting cell surface, cross-linking MHC-II and eliciting intracellular signaling. Crystallographic and mutational data show that the streptococcal pyrogenic exotoxin J can use a common binding surface for T-cell receptor binding and dimerization.,Baker HM, Proft T, Webb PD, Arcus VL, Fraser JD, Baker EN J Biol Chem. 2004 Sep 10;279(37):38571-6. Epub 2004 Jul 7. PMID:15247241 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Exotoxin

spinqualitylabelsall models 1ty0, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image