Efficacy of soluble phospholipids in the prothrombinase reaction.

Abstract:

:The prothrombinase complex is comprised of an enzyme, factor Xa, and a cofactor, factor Va, that each bind peripherally to membranes containing phosphatidylserine (PS) and activate the substrate, prothrombin. The mechanism by which the membrane contributes to enhanced catalytic efficacy of prothrombinase is not precisely known but is generally attributed to some aspect of enzyme and substrate assembly on the multisite surface of the membrane. A recent proposal has suggested a radically different role in which individual phospholipid molecules, either in the membrane or as single soluble molecules, act by an entirely allosteric mechanism that does not involve the multisite feature of the membrane [Zhai, X., Srivastava, A., Drummond, D. C., Daleke, D., and Lentz, B. R. (2002) Biochemistry 41, 5675-5684]. Our study measured prothrombinse activity in the presence of phospholipids such as short-chain phosphatidylserine and lysophosphatidylserine (lyso-PS). Both enhanced prothrombinase activity, and the increase was consistent with the requirement for extended bilayer structure. Even then, prothrombinase activity was low when compared with activity on bilayer membranes of mixed PS and phosphatidylcholine (PC). Lyso-PS approached the activity of PS/PC membranes only when it was mixed with PC bilayers. The results suggest that the two-dimensional membrane bilayer surface is necessary for the support of full prothrombinase activity.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Stone MD,Nelsestuen GL

doi

10.1021/bi047655n

subject

Has Abstract

pub_date

2005-03-15 00:00:00

pages

4037-41

issue

10

eissn

0006-2960

issn

1520-4995

journal_volume

44

pub_type

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