Troponin (Tn) contains three subunits, Ca2+ binding (TnC), inhibitory (TnI), and tropomyosin binding (TnT). this Pfam contains members of the TnT subunit. Troponin is a complex of three proteins, Ca2+ binding (TnC), inhibitory (TnI), and tropomyosin binding (TnT). The troponin complex regulates Ca++ induced muscle contraction. This family includes troponin T and troponin I. Troponin I binds to actin and troponin T binds to tropomyosin.

1: Structure of co-crystals of tropomyosin and troponin. White SP, Cohen C, Phillips GN Jr; Nature 1987;325:826-828. PMID:3102969

2: A direct regulatory role for troponin T and a dual role for troponin C in the Ca2+ regulation of muscle contraction. Potter JD, Sheng Z, Pan BS, Zhao J; J Biol Chem 1995;270:2557-2562. PMID:7852318

3: The troponin complex and regulation of muscle contraction. Farah CS, Reinach FC; FASEB J 1995;9:755-767. PMID:7601340