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- W1569078259 abstract "Abstract We have used a renaturation method to search for previously unidentified protein kinases in human platelets. The method involves subjecting lysates to denaturing gel electrophoresis, transferring the proteins to blotting membranes, and treating the blotted proteins with guanidine. The guanidine is then removed to allow the proteins to renature, and the blots are overlaid with [gamma-32P]ATP. We have identified 14 electrophoretically distinct, serine/threonine-specific protein kinases. Eleven of the kinases clearly differ in molecular weight from all previously described platelet serine/threonine kinases. Ten of these novel kinases (PK220, PK200, PK170, PK150, PK64, PK60, PK56, PK52, PK48, and PK40) were found to possess markedly increased in vitro activity when isolated from thrombin-stimulated platelets, presumably as a result of thrombin-stimulated covalent modification. Treatment of intact platelets with the calcium ionophore ionomycin and phorbol 12-myristate 13-acetate also increased the in vitro activity of these kinases. The agonist-stimulated kinases could be divided into three classes: 1) one kinase whose activity was increased by in vivo phorbol ester treatment but not by ionomycin (PK150); 2) two kinases whose activity was increased by ionomycin but not phorbol ester (PK48 and PK40); 3) seven kinases whose activity was markedly increased by combinations of phorbol ester and ionomycin, but not by either agent alone (PK220, PK200, PK170, PK64, PK60, PK56, and PK52). This third mode of regulation is what would be expected of enzymes that mediate the biological effects of inositide-mobilizing stimuli." @default.
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- W1569078259 date "1989-12-01" @default.
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- W1569078259 title "Thrombin stimulates the activities of multiple previously unidentified protein kinases in platelets" @default.
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- W1569078259 doi "https://doi.org/10.1016/s0021-9258(19)47123-8" @default.
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