1sdd
From Proteopedia
Crystal Structure of Bovine Factor Vai
Structural highlights
Function[FA5_BOVIN] Central regulator of hemostasis. It serves as a critical cofactor for the prothrombinase activity of factor Xa that results in the activation of prothrombin to thrombin. 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 PubMedIn vertebrate hemostasis, factor Va serves as the cofactor in the prothrombinase complex that results in a 300,000-fold increase in the rate of thrombin generation compared with factor Xa alone. Structurally, little is known about the mechanism by which factor Va alters catalysis within this complex. Here, we report a crystal structure of protein C inactivated factor Va (A1.A3-C1-C2) that depicts a previously uncharacterized domain arrangement. This orientation has implications for binding to membranes essential for function. A high-affinity calcium-binding site and a copper-binding site have both been identified. Surprisingly, neither shows a direct involvement in chain association. This structure represents the largest physiologically relevant fragment of factor Va solved to date and provides a new scaffold for the future generation of models of coagulation cofactors. The crystal structure of activated protein C-inactivated bovine factor Va: Implications for cofactor function.,Adams TE, Hockin MF, Mann KG, Everse SJ Proc Natl Acad Sci U S A. 2004 Jun 15;101(24):8918-23. Epub 2004 Jun 7. PMID:15184653[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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