Definition of tropomyosin in English:

tropomyosin

Pronunciation /ˌträpōˈmīəsən/ /ˌtrɑpoʊˈmaɪəsən/

noun

Biochemistry
  • A protein involved in muscle contraction. It is related to myosin and occurs together with troponin in the thin filaments of muscle tissue.

    ‘The addition of regulatory proteins, troponin and tropomyosin, is known to increase the sliding speed of thin filaments in the in vitro motility assay.’
    • ‘Unfavorable interactions could occur at high ionic strength between adjacent tropomyosin molecules, between tropomyosin and troponin, or between other protein pairs.’
    • ‘Flight muscle contraction is regulated by both stretch and Ca 2 + induced thin filament (actin + tropomyosin + troponin complex) activation.’
    • ‘For example, troponin and tropomyosin form large protein complexes with multiple points of interactions with each other and the F-actin helical backbone.’
    • ‘The regulation of contractility in striated muscle by calcium is effected via tropomyosin on the actin filament.’

Origin

1940s from Greek tropos ‘turning’+ myosin.