Regulation of water flow by actin-binding protein-induced actin gelatin.
作者信息
Ito T, Suzuki A, Stossel T P
机构信息
Department of Biophysics, Faculty of Science, Kyoto University, Japan.
出版信息
Biophys J. 1992 May;61(5):1301-5. doi: 10.1016/S0006-3495(92)81938-0.
Abstract
Actin filaments inhibit osmotically driven water flow (Ito, T., K.S. Zaner, and T.P. Stossel. 1987. Biophys. J. 51: 745-753). Here we show that the actin gelation protein, actin-binding protein (ABP), impedes both osmotic shrinkage and swelling of an actin filament solution and reduces markedly the concentration of actin filaments required for this inhibition. These effects depend on actin filament immobilization, because the ABP concentration that causes initial impairment of water flow by actin filaments corresponds to the gel point measured viscometrically and because gelsolin, which noncovalently severs actin filaments, solates actin gels and restores water flow in a solution of actin cross-linked by ABP. Since ABP gels actin filaments in the periphery of many eukaryotic cells, such actin networks may contribute to physiological cell volume regulation.
摘要
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