1zot | pdb_00001zot

crystal structure analysis of the CyaA/C-Cam with PMEAPP

spinqualitylabelsall models 1zot, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1zot is a 2 chain structure with sequence from "bacterium_tussis-convulsivae"_lehmann_and_neumann_1927 "bacterium tussis-convulsivae" lehmann and neumann 1927 and Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, EMA, MG 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. 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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