TNNI3 Antibody – Rabbit Polyclonal

Troponin I (TnI), along with troponin T (TnT) and troponin C (TnC), is one of 3 subunits that form the troponin complex of the thin filaments of striated muscle. TnI is the inhibitory subunit; blocking actin-myosin interactions and thereby mediating striated muscle relaxation. The TnI subfamily contains three genes: TnI-skeletal-fast-twitch, TnI-skeletal-slow-twitch, and TnI-cardiac. This gene encodes the TnI-cardiac protein and is exclusively expressed in cardiac muscle tissues. Mutations in this gene cause familial hypertrophic cardiomyopathy type 7 (CMH7) and familial restrictive cardiomyopathy (RCM). [provided by RefSeq, Jul 2008]

TNNI3: Troponin I is the inhibitory subunit of troponin, the thin filament regulatory complex which confers calcium-sensitivity to striated muscle actomyosin ATPase activity. Binds to actin and tropomyosin. Interacts with TRIM63. Interacts with STK4/MST1. Belongs to the troponin I family.

Protein type: Motility/polarity/chemotaxis; Motor; Actin-binding

Chromosomal Location of Human Ortholog: 19q13.4

Cellular Component: sarcomere; troponin complex; cytosol

Molecular Function: troponin T binding; protein domain specific binding; troponin C binding; protein binding; metal ion binding; calcium channel inhibitor activity; actin binding; protein kinase binding; calcium-dependent protein binding

Biological Process: regulation of smooth muscle contraction; cellular calcium ion homeostasis; heart contraction; regulation of systemic arterial blood pressure by ischemic conditions; heart development; ventricular cardiac muscle morphogenesis; vasculogenesis; negative regulation of ATPase activity; muscle filament sliding; cardiac muscle contraction

Disease: Cardiomyopathy, Dilated, 1ff; Cardiomyopathy, Familial Restrictive, 1; Cardiomyopathy, Familial Hypertrophic, 7; Cardiomyopathy, Dilated, 2a