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Act in the alga, Chara corallina

Abstract

ACTIN and myosin from muscle combine to form filaments with a distinctive arrowhead appearance1. Filaments from several lower organisms2–5 and from cells other than muscle in higher animals6–9 also react with muscle myosin or its subfragments to produce arrowhead filaments. This ability to bind muscle myosin has become accepted as a test for the identification of the filaments as actin. Its validity is supported by the chemical similarities between those actins which have been further characterised5,6,8–13, and by the need for the myosin binding sites to be quite specifically positioned and oriented for the arrowhead effect to arise14. A filament reacting with heavy meromyosin subfragment one (S1) has now been detected in cells of the green alga, Chara corallina.

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WILLIAMSON, R. Act in the alga, Chara corallina. Nature 248, 801–802 (1974). https://doi.org/10.1038/248801a0

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