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- W2014644217 abstract "The conversion of prothrombin into thrombin is an imperative step in the sequence of reactions leading to the formation of a hemostatic plug. This reaction is catalyzed by the prothrombinase complex, composed of factors Xa and Va, which is assembled on a phospholipid surface through Ca-mediated interactions with the lipid polar headgroups. In this paper we describe experiments indicative for a major role of the stereochemical configuration of phosphatidylserine in the binding of the prothrombinase complex to a phospholipid surface. Using two stereoisomers of phosphatidylserine, i.e., L-alpha-glycerophosphoryl-L-serine (PLS) and L-alpha-glycerophosphoryl-D-serine (PDS), we demonstrate that membranes containing PLS are appreciably more favorable than membranes containing PDS in promoting assembly of the prothrombinase complex and catalysis of prothrombin conversion. Ellipsometric analysis of the binding of factor Va and factor Xa to a surface composed of phosphatidylcholine and 10 mol % of either PLS or PDS reveals that the apparent Kd for factor Va increases about 25-fold when substituting PDS for PLS. For factor Xa a 5-fold increase in Kd was observed on replacing PDS for PLS. When PLS is replaced by phosphatidyl-beta-lactate (PLac), a phospholipid resembling PS but lacking the amino group, a similar decrease in prothrombinase activity is found as observed with PDS, implicating the importance of both the amino group and the stereoconfiguration of the serine moiety for the assembly of the prothrombinase complex.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2014644217 date "1994-08-01" @default.
- W2014644217 modified "2023-09-27" @default.
- W2014644217 title "Assembly of the Prothrombinase Complex on Lipid Vesicles Depends on the Stereochemical Configuration of the Polar Headgroup of Phosphatidylserine" @default.
- W2014644217 doi "https://doi.org/10.1021/bi00200a012" @default.
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