Troponin I

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, 191042)
• Fast-twitch skeletal muscle isoform troponin I, TNNI2 (11p15.5, 191043)
• Cardiac troponin I, TNNI3 (19q13.4, 191044)

• Troponin+I at the US National Library of Medicine Medical Subject Headings (MeSH)

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