Troponin I



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Overview
Troponin I is a part of the troponin complex. It binds to actin in thin myofilaments to hold the troponin-tropomyosin complex in place. The letter I is given due to its inhibitory character.

The tissue specific subtypes are:
 * Slow-twitch skeletal muscle isoform troponin I, TNNI1 (1q31.3, )
 * Fast-twitch skeletal muscle isoform troponin I, TNNI2 (11p15.5, )
 * Cardiac troponin I, TNNI3 (19q13.4, )