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• W1519441411 abstract "A family of homologous actin-binding proteins sever and cap actin filaments and accelerate actin filament assembly. The functions of two of these proteins, villin and gelsolin, and of their proteolytically derived actin binding domains were compared directly by measuring their effects, under various ionic conditions, on the rates and extents of polymerization of pyrene-labeled actin. In 1 mM Ca2+ and 150 mM KCl, villin and gelsolin have similar severing and polymerization-accelerating properties. Decreasing [Ca2+] to 25 microM greatly reduces severing by villin but not gelsolin. Decreasing [KCl] from 150 to 10 mM at 25 microM Ca2+ increases severing by villin, but not gelsolin, over 10-fold. The C-terminal half domains of both proteins have Ca2+-sensitive actin monomer-binding properties, but neither severs filaments nor accelerates polymerization. The N-terminal halves of villin and gelsolin contain all the filament-severing activity of the intact proteins. Severing by gelsolin's N-terminal half is Ca2+-independent, but that of villin has the same Ca2+ requirement as intact villin. The difference in Ca2+ sensitivity extends to 14-kDa N-terminal fragments which bind actin monomers and filament ends, requiring Ca2+ in the case of villin but not gelsolin. Severing of filaments by villin and its N-terminal half is shown to be inhibited by phosphatidylinositol 4,5-bisphosphate, as shown previously for gelsolin (Janmey, P.A., and Stossel, T.P. (1987) Nature 325, 362-364). The functional similarities of villin and gelsolin correlate with known structural features, and the greater functional dependence of villin on Ca2+ compared to gelsolin is traced to differences in their N-terminal domains." @default.
• W1519441411 created "2016-06-24" @default.
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• W1519441411 date "1988-11-01" @default.
• W1519441411 modified "2023-10-01" @default.
• W1519441411 title "Functional comparison of villin and gelsolin. Effects of Ca2+, KCl, and polyphosphoinositides." @default.
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• W1519441411 doi "https://doi.org/10.1016/s0021-9258(18)37453-2" @default.
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