Definition of troponin in English:


Syllabification: tro·po·nin
Pronunciation: /ˈträpənən, ˈtrō-


  • A globular protein complex involved in muscle contraction. It occurs with tropomyosin in the thin filaments of muscle tissue.
    More example sentences
    • Actin, myosin, and troponin and tropomyosin were isolated from rabbit back muscle.
    • The tropomyosin and troponin proteins on the actin filament provide the switch.
    • The addition of regulatory proteins, troponin and tropomyosin, is known to increase the sliding speed of thin filaments in the in vitro motility assay.


1960s: from tropomyosin + -n- + -in1.

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