2col | pdb_00002col

Crystal structure analysis of CyaA/C-Cam with Pyrophosphate

spinqualitylabelsall models 2col, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2col is a 2 chain structure with sequence from "bacterium_tussis-convulsivae"_lehmann_and_neumann_1927 "bacterium tussis-convulsivae" lehmann and neumann 1927 and African clawed frog. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, MG, POP Activity: Adenylate cyclase, with EC number 4.6.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CYAA_BORPE] This adenylate cyclase belongs to a special class of bacterial toxin. It causes whooping cough by acting on mammalian cells by elevating cAMP-concentration and thus disrupts normal cell function. [CALM_XENLA] Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases. 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 CyaA is crucial for colonization by Bordetella pertussis, the etiologic agent of whooping cough. Here we report crystal structures of the adenylyl cyclase domain (ACD) of CyaA with the C-terminal domain of calmodulin. Four discrete regions of CyaA bind calcium-loaded calmodulin with a large buried contact surface. Of those, a tryptophan residue (W242) at an alpha-helix of CyaA makes extensive contacts with the calcium-induced, hydrophobic pocket of calmodulin. Mutagenic analyses show that all four regions of CyaA contribute to calmodulin binding and the calmodulin-induced conformational change of CyaA is crucial for catalytic activation. A crystal structure of CyaA-calmodulin with adefovir diphosphate, the metabolite of an approved antiviral drug, reveals the location of catalytic site of CyaA and how adefovir diphosphate tightly binds CyaA. The ACD of CyaA shares a similar structure and mechanism of activation with anthrax edema factor (EF). However, the interactions of CyaA with calmodulin completely diverge from those of EF. This provides molecular details of how two structurally homologous bacterial toxins evolved divergently to bind calmodulin, an evolutionarily conserved calcium sensor. Structural basis for the interaction of Bordetella pertussis adenylyl cyclase toxin with calmodulin.,Guo Q, Shen Y, Lee YS, Gibbs CS, Mrksich M, Tang WJ EMBO J. 2005 Sep 21;24(18):3190-201. Epub 2005 Sep 1. PMID:16138079 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calmodulin 3D structures 3D Adenylyl cyclase 3D structures

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