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• W1625208520 abstract "The binding of 125I-calmodulin to intact secretion granules and protein gel blots of secretion granules from pancreatic islet tissue was examined. Binding of 125I-calmodulin to intact secretion granules was Ca2+-dependent and inhibited by the calmodulin inhibitors trifluoperazine and calmidazolium. Binding was inhibited by excess (200 nM) unlabeled calmodulin, but not by parvalbumin, a Ca2+-binding protein which has little sequence homology to calmodulin. In order to study the binding of calmodulin to specific secretion granule proteins, secretion granules were solubilized, and the solubilized proteins were resolved on sodium dodecyl sulfate-polyacrylamide gels, electrophoretically transferred to nitrocellulose, and incubated with 125I-calmodulin. Autoradiograms of the protein gel blots revealed the presence of three major calmodulin-binding proteins with approximate molecular weights of 73,000, 64,000, and 58,000. These proteins reversibly bound calmodulin in a calcium-dependent manner. Unlabeled calmodulin in the range of 0.1-1.0 nM competed with 125I-calmodulin for binding to these proteins, whereas troponin and parvalbumin were 100 and 1000-fold less effective, respectively. Trifluoperazine blocked binding to the granule proteins in a range of 10(-4) to 10(-5) M, and calmidazolium was effective between 10(-5) and 10(-6) M. Trypsin, at a concentration which did not lyse granules, markedly inhibited calmodulin binding to intact secretion granules. Protein blots from trypsin-treated granules showed that the three major calmodulin-binding proteins were absent. These results indicate that Ca2+-dependent calmodulin-binding proteins are present on the cytoplasmic surface of islet secretion granules and are consistent with the hypothesis that these proteins may play a role in secretion granule exocytosis." @default.
• W1625208520 created "2016-06-24" @default.
• W1625208520 creator A5013553600 @default.
• W1625208520 creator A5041557633 @default.
• W1625208520 date "1985-04-01" @default.
• W1625208520 modified "2023-09-28" @default.
• W1625208520 title "Identification and characterization of calmodulin-binding proteins in islet secretion granules." @default.
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• W1625208520 doi "https://doi.org/10.1016/s0021-9258(18)89193-1" @default.
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