Role of nucleotide exchange and hydrolysis in the function of profilin in action assembly.


Profilin, an essential G-actin-binding protein, has two opposite regulatory functions in actin filament assembly. It facilitates assembly at the barbed ends by lowering the critical concentration (Pantaloni, D., and Carlier, M.-F. (1993) Cell 75, 1007-1014); in contrast it contributes to the pool of unassembled actin when barbed ends are capped. We proposed… (More)


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