Proteolytic events that regulate factor V activity in whole plasma from normal and activated protein C (APC)-resistant individuals during clotting: an insight into the APC-resistance assay.

Abstract

Human factor V is activated to factor Va by alpha-thrombin after cleavages at Arg709, Arg1018, and Arg1545. Factor Va is inactivated by activated protein C (APC) in the presence of a membrane surface after three sequential cleavages of the heavy chain. Cleavage at Arg506 provides for efficient exposure of the inactivating cleavages at Arg306 and Arg679… (More)

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