1ynt | pdb_00001ynt

Structure of the immunodominant epitope displayed by the surface antigen 1 (SAG1) of Toxoplasma gondii complexed to a monoclonal antibody

spinqualitylabelsall models 1ynt, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ynt is a 7 chain structure with sequence from Finegoldia magna, Mus musculus and Toxoplasma gondii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CD Related: 1kzq Resources: FirstGlance, OCA, 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 Toxoplasma gondii, the intracellular parasite responsible for toxoplasmosis infects more than one-third of the world population and can be life-threatening for fetuses and immunocompromised patients. The surface protein SAG1 is an important immune target, which provides a strong immune response against the invasive tachyzoite while the other forms of the parasite, devoid of SAG1 at their surface, are multiplying. In addition to this role as a "hot spot" decoy, SAG1 is predicted to act as an adhesin during host-cell attachment through its binding to proteoglycans. To begin to understand the relationships between SAG1 epitopes and the ligand-binding site, we have solved the crystal structure of the monomeric form of T.gondii SAG1 complexed to a Fab derived from a monoclonal antibody raised against tachyzoite particles. This antibody competes strongly with human Toxoplasma-specific sera, suggesting that its epitope is part of an immunodominant region present on the surface of SAG1. The structure reveals that this conformational epitope, located within the SAG1 N-terminal domain, does not overlap with the proposed ligand-binding pocket. This study provides the first structural description of the monomeric form of SAG1, and significant insights into its dual role of adhesin and immune target during parasite infection. Crystal structure of the complex between the monomeric form of Toxoplasma gondii surface antigen 1 (SAG1) and a monoclonal antibody that mimics the human immune response.,Graille M, Stura EA, Bossus M, Muller BH, Letourneur O, Battail-Poirot N, Sibai G, Gauthier M, Rolland D, Le Du MH, Ducancel F J Mol Biol. 2005 Nov 25;354(2):447-58. Epub 2005 Sep 30. PMID:16242717 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Monoclonal Antibody

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