one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form
A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
One of the six isoforms of actin.
Actin is a globular multi-functional protein that forms microfilaments. It is found in all eukaryotic cells, where it may be present at concentrations of over 100 μM. Actin is roughly 42-kDa in size and it is the monomeric subunit of two types of filaments in cells: microfilaments, one of the three major components of the cytoskeleton, and thin filaments, part of the contractile apparatus in muscle cells. It can be present as either a free monomer called G-actin or as part of a linear polymer microfilament called F-actin both of which are essential for such important cellular functions as the mobility and contraction of cells during cell division. Thus, actin participates in many important cellular processes, including muscle contraction, cell motility, cell division and cytokinesis, vesicle and organelle movement, cell signalling, and the establishment and maintenance of cell junctions and cell shape. Many of these processes are mediated by extensive and intimate interactions of actin with cellular membranes. In vertebrates, three main groups of actin isoforms, alpha, beta, and gamma have been identified. The alpha actins, found in muscle tissues, are a major constituent of the contractile apparatus. The beta and gamma actins coexist in most cell types as components of the cytoskeleton, and as mediators of internal cell motility.
The numerical value of actin in Chaldean Numerology is: 5
The numerical value of actin in Pythagorean Numerology is: 2
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