Abstract

SummaryThe isolation of an actomyosin-like protein from platelets with a Ca2+ sensitive component is described. The addition of 1 mM EGTA results in approximately 40% and 75% inhibition of the Mg-ATPase activity depending on the mode of isolation. The inhibition can be released by a free Ca2+ concentration of 3×l0-6 M. Superprecipitation is also inhibited by 1 mM EGTA and restored in the presence of 10-5 M free Ca2+.

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