Direct interactions between talin and actin

Biochemical and Biophysical Research Communications
M MugurumaT Fukazawa

Abstract

Talin was purified from chicken gizzard by a modification of the method of L. Molony et al. [J. Biol. Chem.(1987) 262, 7790-7795]. Unlike the talin purified by the previous method, the talin purified by the new method was found to bind to both F- and G-actin: Talin cosedimented with F-actin. On gel filtration of a mixture of talin and G-actin, a complex of talin and action was obtained. Talin stimulated the polymerization rate of G-actin. A major proteolytic fragment of talin that retained the binding ability to F-actin was also identified. These results indicate that talin can bind directly to actin and suggest that talin plays a key role in the organization of actin filaments at the actin-membrane attachment sites in vivo also.

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