(redirected from G-actin)
Also found in: Thesaurus, Medical, Encyclopedia.


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 ?
Brownian dynamics (BD) simulations between LDH with previously built models of F-actin and G-actin (2) were performed.
This probably depends on the use of F-actin and not G-actin as antigen in the ELISA: In vitro incubation of intestinal epithelial cells with gliadin caused intracellular actin polymerization with an increase in F-actin (2), which is the real neo-epitope recognized by AAAs.
G-actin monomers are released into the blood in large quantities in certain disease conditions and when there is acute tissue injury or infection.