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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 ?
The project leader Prof Inari Kursula said that the structures showed them that the two variants differ more from each other than actins in any other known living organism do and the high resolution enabled the researchers to identify areas within the proteins that cause the different behaviour.
Actins are highly conserved proteins that are part of the cytoskeleton.
The tumor cells are immunoreactive with actins and vimentin but not with CD34, CD31, or FVIII-RAg.
To avoid misdiagnosis in immunohistochemical testing, it is advisable to use a broad panel of antibodies, including actins (SMA and HHF-35), desmin, vimentin, cytokeratins, and S-100 protein.