noun, plural: troponins
A regulatory protein that is a complex of three polypeptides (i.e. troponin c, troponin i, and troponin t). It has an affinity for calcium ions and is associated with tropomyosin. Together with tropomyosin, it regulates actin-myosin interactions in skeletal and cardiac muscle contraction.
Troponin is made up of three regulatory proteins:
See also: tropomyosin