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• W1541932063 abstract "Profilin inhibits the rate of nucleation of actin polymerization and the rate of filament elongation and also reduces the concentration of F-actin at steady state. Addition of profilin to solutions of F-actin causes depolymerization. The same steady state concentrations of polymerized and nonpolymerized actin are reached whether profilin is added before initiation of polymerization or after polymerization is complete. The KD for formation of the 1:1 complex between Acanthamoeba profilin and Acanthamoeba actin is in the range of 4 to 11 microM; the KD for the reaction between Acanthamoeba profilin and rabbit skeletal muscle actin is about 60 to 80 microM, irrespective of the concentrations of KCl or MgCl2. The critical concentration of actin for polymerization and the KD for the actin-profilin interaction are independent of each other; therefore, a change in the critical concentration of actin alters the amount of actin bound to profilin at steady state. As a consequence, the presence of profilin greatly amplifies the effects of small changes in the actin critical concentration on the concentration of F-actin. Profilin also inhibits the ATPase activity of monomeric actin, the profilin-actin complex being entirely inactive." @default.
• W1541932063 created "2016-06-24" @default.
• W1541932063 creator A5029138554 @default.
• W1541932063 creator A5056320284 @default.
• W1541932063 date "1982-04-01" @default.
• W1541932063 modified "2023-09-27" @default.
• W1541932063 title "The regulation of actin polymerization and the inhibition of monomeric actin ATPase activity by Acanthamoeba profilin." @default.
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• W1541932063 doi "https://doi.org/10.1016/s0021-9258(18)34701-x" @default.
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