- Thrombin a-chain: activation remnant or allosteric effector?
Thrombin a-chain: activation remnant or allosteric effector?
Thrombosis (2010-01-01)
Isis S R Carter, Amanda L Vanden Hoek, Edward L G Pryzdial, Ross T A Macgillivray
PMID22084659
RESUMEN
Although prothrombin is one of the most widely studied enzymes in biology, the role of the thrombin A-chain has been neglected in comparison to the other domains. This paper summarizes the current data on the prothrombin catalytic domain A-chain region and the subsequent thrombin A-chain. Attention is given to biochemical characterization of naturally occurring prothrombin A-chain mutations and alanine scanning mutants in this region. While originally considered to be simply an activation remnant with little physiologic function, the thrombin A-chain is now thought to play a role as an allosteric effector in enzymatic reactions and may also be a structural scaffold to stabilize the protease domain.
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