actin

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actin,

a protein abundantly present in many cells, especially muscle cells, that significantly contributes to the cell's structure and motility. Actin can very quickly assemble into long polymer rods called microfilaments. These microfilaments have a variety of roles—they form part of the cell's cytoskeleton, they interact with myosinmyosin
, one of the two major protein constituents responsible for contraction of muscle. In muscle cells myosin is arranged in long filaments called thick filaments that lie parallel to the microfilaments of actin.
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 to permit movement of the cell, and they pinch the cell into two during cell division. In muscle contraction, filaments of actin and myosin alternately unlink and chemically link in a sliding action. The energy for this reaction is supplied by adenosine triphosphateadenosine triphosphate
(ATP) , organic compound composed of adenine, the sugar ribose, and three phosphate groups. ATP serves as the major energy source within the cell to drive a number of biological processes such as photosynthesis, muscle contraction, and the synthesis of
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.
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actin

[′ak·tən]
(biochemistry)
A muscle protein that is the chief constituent of the Z-band myofilaments of each sarcomere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Clinical and genetic heterogeneity in nemaline myopathy--a disease of skeletal muscle thin filaments. Trends Mol Med 2001; 7: 362-8.
Effect of myosin on conformational changes of F-actin in thin filament in vivo induced by calcium ions.
(1967) Periodic distribution of troponin along the thin filament. J.
Roles of the troponin tail domain in thin filament assembly and regulation.
In the muscle fiber in which thin and thick filament were mixed, the thin filament was approximately 10 nm in diameter, whereas that of the thick filament was 80 nm.
Strictly speaking, the thin filament equations (like those developed in this paper) do not apply to this transition zone.
the width of either of two adjacent lobes narrows markedly, making it possible that a thin filament could be hidden;
In operation, a thin filament material from a supply reel feeds into a heated FDM extrusion head.
They heat the filled tube and draw it into a thin filament. They then bundle many of these filaments together and heat and draw the bundle.
According to new report available with Million Insights, Dental Floss is a cord of thin filaments exclusively used to remove dental plaque and food from between teeth.
Recently, a conductance quantization in very thin filaments (with the thickness reduced down to the atomic scale) has been observed experimentally [5, 6].
Carbon Fiber is a material consisting of very thin filaments of carbon atoms.