Definition: Filamentous proteins that are the main constituent of the thin filaments of muscle fibers. The filaments (known also as filamentous or F-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. This is known as globular or G-actin. In conjunction with MYOSINS, actin is responsible for the contraction and relaxation of muscle.
Other names G-Actin; F-Actin; gamma Actin; beta Actin; alpha Isoactin; alpha Actin; N Actin; G Actin; F Actin; gamma-Actin; beta-Actin; alpha-Isoactin; alpha-Actin; N-Actin; Isoactin; Actin