Meaning of actin in English:


Pronunciation /ˈaktɪn/


mass nounBiochemistry
  • A protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cell.

    ‘Muscle contraction is dependent on two proteins, actin and myosin.’
    • ‘As the cells round up, actin and myosin moieties are being redistributed underneath the plasma membrane.’
    • ‘Striated muscle contraction is regulated by a protein complex bound to actin.’
    • ‘Muscle contraction results from the cyclic interaction of the myosin head with actin.’
    • ‘Rabbit skeletal muscle actin was prepared as described and subjected to gel filtration.’


1940s from Greek aktis, aktin- ‘ray’ + -in.