TNNT2 which encodes the cardiac muscle troponin T functions as part of the Troponin complex with its N-terminal region of TNT apart of the globular troponin complex domain.
Cardiac muscle troponin T (cTnT) is a protein that in humans is encoded by the TNNT2 gene. Cardiac TnT is the tropomyosin-binding subunit of the troponin complex, which is located on the thin filament of striated muscles and regulates muscle contraction in response to alterations in intracellular calcium ion concentration. The structure of TnT is asymmetric; the globular C-terminal domain interacts with tropomyosin (Tm), TnI and TnC, and the N-terminal tether which strongly binds Tm. The C-terminal region of TnT constitutes part of the globular troponin complex domain, and participates in employing the calcium sensitivity of strong myosin crossbridge binding to the thin filament. 
