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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.

[Latin āctus, motion; see act + -in.]


(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]


(ˈæk tən)

a protein that functions in muscular contraction by combining with myosin. Compare actomyosin.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
References in periodicals archive ?
2+]-ATPase interaction, also the decavanadate interaction with G-actin leads to cysteine oxidation and vanadyl formation, whereas no reductions were observed upon vanadate incubation [1, 3].
Structural and Phylogenetic Analysis of the g-Actin Encoding Gene from the Penicillin-Producing Fungus Penicillium chrysogenum.
vc]) covalently binds to G-actin and F-actin, and causes actin depolymerization, which leads to cell rounding (Kudryashov et al.