Abstract
We studied the modulating role of cardiac myosin-binding protein C (cMyBP-C) in tropomyosin regulation of the actin-myosin interaction. The effect of cMyBP-C on the velocity of actin-tropomyosin filament sliding over cardiac and slow skeletal myosins was evaluated using in vitro motility assay. The effect of cMyBP-C on the actin-tropomyosin filaments sliding depended on the type of myosin. The regulatory effect of cMyBP-C differs for cardiac and slow skeletal myosin because of the presence of specific essential light chain (LC1sa) in slow skeletal myosin isoform.
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