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Capping complex formation at the slow-growing end of the actin filament

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Abstract

Actin filaments are polar; their barbed (fast-growing) and pointed (slow-growing) ends differ in structure and dynamic properties. The slow-growing end is regulated by tropomodulins, a family of capping proteins that require tropomyosins for optimal function. There are four tropomodulin isoforms; their distributions vary depending on tissue type and change during development. The C-terminal half of tropomodulin contains one compact domain represented by alternating α-helices and β-structures. The tropomyosin-independent actin-capping site is located at the C-terminus. The N-terminal half has no regular structure; however, it contains a tropomyosin-dependent actin-capping site and two tropomyosin-binding sites. One tropomodulin molecule can bind two tropomyosin molecules. Effectiveness of tropomodulin binding to tropomyosin depends on the tropomyosin isoform. Regulation of tropomodulin binding at the pointed end as well as capping effectiveness in the presence of specific tropomyosins may affect formation of local cytoskeleton and dynamics of actin filaments in cells.

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Correspondence to A. S. Kostyukova.

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Original Russian Text © A. S. Kostyukova, 2008, published in Uspekhi Biologicheskoi Khimii, 2008, Vol. 48, pp. 253–266.

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Kostyukova, A.S. Capping complex formation at the slow-growing end of the actin filament. Biochemistry Moscow 73, 1467–1472 (2008). https://doi.org/10.1134/S0006297908130075

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