2aiq

Crystal structure of benzamidine-inhibited protein C activator from the venom of copperhead snake Agkistrodon contortrix contortrix

spinqualitylabelsall models 2aiq, resolution 1.54Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2aiq is a 1 chain structure with sequence from Agkistrodon contortrix contortrix. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, BEN, CL, GOL, NAG, SO4 Related: 2aip Activity: Venombin A, with EC number 3.4.21.74 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [VSPCA_AGKCO] Snake venom serine protease that selectively cleaves the heavy chain of protein C (PROC). This activation is thrombomodulin-independent. 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 Protein C activation initiated by the thrombin-thrombomodulin complex forms the major physiological anticoagulant pathway. Agkistrodon contortrix contortrix protein C activator, a glycosylated single-chain serine proteinase, activates protein C without relying on thrombomodulin. The crystal structures of native and inhibited Agkistrodon contortrix contortrix protein C activator determined at 1.65 and 1.54 A resolutions, respectively, indicate the pivotal roles played by the positively charged belt and the strategic positioning of the three carbohydrate moieties surrounding the catalytic site in protein C recognition, binding, and activation. Structural changes in the benzamidine-inhibited enzyme suggest a probable function in allosteric regulation for the anion-binding site located in the C-terminal extension, which is fully conserved in snake venom serine proteinases, that preferentially binds Cl(1-) instead of SO(4)(2-). Thrombomodulin-independent activation of protein C and specificity of hemostatically active snake venom serine proteinases: crystal structures of native and inhibited Agkistrodon contortrix contortrix protein C activator.,Murakami MT, Arni RK J Biol Chem. 2005 Nov 25;280(47):39309-15. Epub 2005 Sep 14. PMID:16162508 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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