actin(redirected from G-actin)
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A protein that forms the microfilaments of the eukaryotic cytoskeleton and plays an important role in cell movement, shape, and internal organization. In muscle cells, it functions with myosin to produce contraction.
(Biochemistry) a protein that participates in many kinds of cell movement, including muscle contraction, during which it interacts with filaments of a second protein, myosin
[C20: from act + -in]
a protein that functions in muscular contraction by combining with myosin. Compare actomyosin.
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|Noun||1.||actin - one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form|
actomyosin - a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions
simple protein - a protein that yields only amino acids when hydrolyzed