The adenosinetriphosphatase activity of myosin preparations

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Abstract
The finding of Engelhardt and Liubimova was confirmed that myosin preps, have adenosinetriphosphatase activity, splitting off one phosphate group rapidly, the other very slowly or not at all. More than 90% of the adenosinetriphosphatase activity of muscle was found in the washed residue, less than 10% in the aqueous muscle extract. Abolition of the -SH groups of myosin had no effect on the adenosinetriphosphatase activity. Myosin preparations showed no a-glycerophosphatase of hexosediphosphatase activity, either at pH 9.1 or pH 6.0; nor had they any power to transfer phosphate from ATP to fructose-6-phosphate.