Inhibition of myosin ATPase by beryllium fluoride.
1992
Inhibition of the myosin subfragment 1 (S-1) ATPase activity by beryllium fluoride was studied directly in the presence of MgATP and following preincubation of samples with MgADP. In both cases, the rates of inhibition were very slow, with k app =0.5 and 58 M -1 s -1 , respectively, in analogy to the rates of inhibition of myosin ATPase by vanadate [Goodno, C. C. (1979) Proc. Natl. Acad. Sci. U.S.A. 76, 2620-2624]. The very different rates of inhibition in the presence of MgATP and on preincubation with MgADP suggested that beryllium fluoride binds to the M.ADP state of myosin
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