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Troponin

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Template:STRUCTURE 1yv0

Troponin (Tn) is a regulatory protein in muscle contraction. It contains 3 subunits:

TnC causes conformational change in TnI when it binds to calcium ions. For more details on TnC see Role of Troponin C in decreased muscle sensitivity to calcium.
TnT binds to tropomyosin.
TnI binds to actin which is found in thin muscle filaments.

See additional details in Human Cardiac Troponin C.