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. 1993 Sep 15;294(Pt 3):675–680. doi: 10.1042/bj2940675

Vinculin is a major platelet protein that undergoes Ca(2+)-dependent tyrosine phosphorylation.

J G Vostal 1, N R Shulman 1
PMCID: PMC1134515  PMID: 7691054

Abstract

When intracellular Ca2+ pools are released during platelet stimulation by thrombin, elevation of platelet cytosolic Ca2+ concentration induces tyrosine phosphorylation of a 130 kDa protein, and refilling the pools mediates dephosphorylation of this protein [Vostal, Jackson and Shulman (1991) J. Biol. Chem. 266, 16911-16916]. In the present work the 130 kDa protein was identified as vinculin by the following criteria. (1) It is detected on protein immunoblots of thrombin-activated platelets by both monoclonal anti-phosphotyrosine and anti-vinculin antibodies. (2) Removal of N-linked sugars with peptide-N-glycosidase or reduction did not change the molecular mass of vinculin or of the 130 kDa protein on SDS/PAGE. (3) The 130 kDa tyrosine-phosphorylated protein associates with Triton-soluble fraction of platelets as does vinculin. (4) The 130 kDa protein immunoprecipitated by anti-vinculin monoclonal antibody reacts with anti-phosphotyrosine antibody; when immunoprecipitated by anti-phosphotyrosine antibody it reacts with anti-vinculin antibody. (5) The 130 kDa tyrosine-phosphorylated protein and vinculin focus isoelectrically at pI 5.4-5.8. Our finding that vinculin is a major platelet protein that undergoes Ca(2+)-dependent tyrosine phosphorylation during platelet activation may provide clues to the function of this protein.

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