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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.
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Broader Concept:
Entry Terms:
  • N-actin
  • F-actin
  • gamma-actin
  • G-actin
  • beta-actin
  • alpha-actin
  • alpha-isoactin
  • isoactin
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RDF/XMLCreated 2006-01-19, last modified 2017-03-08