Definition of troponin in English:


Line breaks: tropo|nin
Pronunciation: /ˈtrəʊpə(ʊ)nɪn


[mass noun] Biochemistry
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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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
turned backwards