Function of Troponin--
Troponin slides past myosin causing muscle shortening. Troponin forms the cross-bridges between actin and myosin. Troponin moves tropomyosin from actin so that the actin can bind to myosin.
What is Troponins?
Troponins are the protein filament components of the contractile cardiac and skeletal muscles, but which are not present in smooth muscle . The contractile apparatus of skeletal and myocardial striated muscle is composed of myosin-containing thick filaments, surrounded by an octagonal array of actin-containing thin filaments. The thin filament includes an actin helix bordered by tropomyosin strands that periodically contain a three-member “troponin complex.” The sliding filament model of muscle contraction proposes that an ATP-dependent actin and myosin interactions is “triggered” by release of calcium ions during electrical depolarization.
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