4etq

Vaccinia virus D8L IMV envelope protein in complex with Fab of murine IgG2a LA5

spinqualitylabelsall models 4etq, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4etq is a 6 chain structure with sequence from Mus musculus and Vaccinia virus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: CL, EDO, GOL, SCN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q1M1K6_9POXV Publication Abstract from PubMed Smallpox vaccine is considered a gold standard of vaccines, as it is the only one that has led to the complete eradication of an infectious disease from the human population. B cell responses are critical for the protective immunity induced by the vaccine, yet their targeted epitopes recognized in humans remain poorly described. Here we describe the biochemical and structural characterization of one of the immunodominant vaccinia virus (VACV) antigens D8 and its binding to the monoclonal antibody LA5, which is capable of neutralizing VACV in the presence of complement. Full length D8 ectodomain was found to form a tetramer. We determined the crystal structure of the LA5 Fab - monomeric D8 complex at a resolution of 2.1 A, as well as the unliganded structures of D8 and LA5-Fab at resolutions of 1.42 A and 1.6 A, respectively. D8 features a carbonic anhydrase (CAH) fold that has evolved to bind to the glycosaminoglycan (GAG) chondroitin sulfate (CS) on host cells. The central positively charged crevice of D8 was predicted as the CS binding site by automated docking experiments. Furthermore, sequence alignment of various poxvirus D8 orthologs revealed that this crevice is structurally conserved. The D8 epitope is formed by 23 discontinuous residues that are spread across 80% of the D8 protein sequence. Interestingly, LA5 binds with a high affinity lock-and-key mechanism above this crevice with an unusually large antibody - antigen interface, burying 2434 A(2) of protein surface. Structural and biochemical characterization of the vaccinia virus envelope protein D8 and its recognition by the antibody LA5.,Matho MH, Maybeno M, Benhnia MR, Becker D, Meng X, Xiang Y, Crotty S, Peters B, Zajonc DM J Virol. 2012 May 23. PMID:22623786 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Monoclonal Antibodies 3D structures

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