PMID: 3383851Jun 1, 1988Paper

Cross-linking of alpha and gamma-thrombin to distinct binding sites on human platelets

European Journal of Biochemistry
M Jandrot-PerrusA T Nurden

Abstract

The interaction of thrombin with proteins at the platelet surface was assessed by chemical cross-linking with the membrane-impermeable reagents bis(sulphosuccinimidyl)suberate and dithiobis(sulphosuccinimidyl propionate) under conditions which induced no modification of intracellular proteins and minimal cross-linking of membrane glycoproteins. The proteins covalently linked to 125I-labelled alpha and gamma-thrombin were analyzed by sodium dodecyl sulfate/polyacrylamide gel electrophoresis and crossed immunoelectrophoresis. 125I-alpha-thrombin was detected in high-molecular-mass complexes (a) at the top of a 3% acrylamide stacking gel and (b) with a Mr approximately equal to 400,000. In addition, two complexes of 240 kDa and 78 kDa were characterized. Hirudin prevented the formation of each of these complexes. The 78-kDa complex occurred spontaneously in the absence of bifunctional reagents, was only observed with active alpha-thrombin and was not dissociated by hirudin. Such characteristics are similar to those of a serpin serine-protease complex. The 240-kDa complex was formed with 0.8-100 nM alpha-thrombin, was observed after a short incubation time (30 s) and occurred with TosLysCH2Cl-inactivated alpha-thrombin. After analy...Continue Reading

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Jan 15, 2004·Trends in Molecular Medicine·Karen VanhoorelbekeHans Deckmyn
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