<cell biology> A filamentous proteins (42 kD) involved in muscle contraction in both smooth and striated muscle and also serves as an important structural molecule for the cytoskeleton of many eukaryotic cells.

It is the main constituent of the thin filaments of muscle fibres. 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 myosin, actin is responsible for the contraction and relaxation of muscle.

See: myosin.

(25 Jun 1999)

ACTH suppression test, acth syndrome, ectopic, actihaemyl < Prev | Next > actinal, actinaria, actin filament

Bookmark with: icon icon icon icon iconword visualiser Go and visit our forums Community Forums