Definition of actomyosin in English:



mass nounBiochemistry
  • A complex of actin and myosin of which the contractile protein filaments of muscle tissue are composed.

    • ‘It has been recognized that various NTPs have different affinities for actomyosin, and myosins complexed with these NTPs or their products have different affinities for actin.’
    • ‘We presented evidence implicating actin polymerization and not actomyosin activity as the dominant mechanism actuating the stiffening response.’
    • ‘The lower actomyosin content of immature fibers compared to mature adult skeletal muscle fibers may account for this observation.’
    • ‘We have a worm whose body wall is a collagenous membrane and whose engine is the muscle protein actomyosin.’
    • ‘When muscles contract, electrical impulses cause the two proteins to slide past each other and bond, forming a complex molecule known as actomyosin, shortening and holding the position.’


1940s: from actin + myosin.