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ATP-induced dissociation of the actin–S1 complex.A, transient kinetics of dissociation of the complex of 0.05 μM PFA +0.05 μM cardiac myosin S1 by 25 μM MgATP. B, kobsversus [MgATP] in the absence (green) and presence (pink) of 0.25 μM Mit. Fast and slow rate constants are kobs1 (filled circles) and kobs2 (open circles). Nonlinear fit to a hyperbolic equation yields k+2 (Table 1).
