Phosphorylation of the cardiac isoform of calsequestrin in cultured rat myotubes and rat skeletal muscle.

Abstract excerpt

Calsequestrin is a high-capacity Ca(2+)-binding protein and a major constituent of the sarcoplasmic reticulum (SR) of both skeletal and cardiac muscle. Two isoforms of calsequestrin, cardiac and skeletal muscle forms, have been described which are products of separate genes. Purified forms of the two prototypical calsequestrin isoforms, dog cardiac and rabbit fast-twitch skeletal muscle calsequestrins, serve as...

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