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JBC, Vol. 250, Issue 16, 6344-6350, Aug, 1975

Transient state kinetic studies of proton liberation by myosin and subfragment 1

J. F. Koretz and E. W. Taylor

Myosin and subfragment 1 give a maximum burst size of 0.25 to 0.30 protons per active site at pH 8 with ATP, alpha,beta-methylene-ATP, ADP, and adenylyl imidodiphosphate as substrates. The proton is derived from a change in conformation of the enzyme-substrate complex since it is produced by substrates which are not hydrolyzed. The rate constants for the binding of ATP and the proton release step in 0.1 M, 0.5 M, and 1.0 M KCl have been determined by analysis of the concentration dependence of the apparent rate. (see article)
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