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Factor Xa
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Contents |
Introduction
Factor X is a vitamin K-dependent glycoprotein that is synthesized in the liver. Zymogen factor X circulates in plasma as a 2 chain molecule composed of a disulfide linked light chain (Mr = 16500) and heavy chain (Mr = 42,000). Factor X is activated to factor Xa by cleavage of the activation peptide. This reaction is catalyzed by factor VIIa-tissue factor (extrinsic Xase complex) and factor IXa-factor VIIIa (intrinsic Xase complex).[1]
Factor Xa, along with factor Va, calcium, and a phospholipid membrane surface form the prothrombinase complex, to cleave prothrombin to its active form, thrombin.
Structure
Enzyme Mechanism
General Serine Protease Mechanism
Related Enzymes
References
- ↑ Greer, John (2008). Wintrobe's Clinical Hematology, p. 545-546. Lippincott Williams & Wilkins. ISBN 0781765072.
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Jacqueline Gertz, Michal Harel, Alexander Berchansky, David Canner, Jaime Prilusky
