Chicken Gizzard Heavy Meromyosin that Retains the Two Light-Chain Components, Including a Phosphorylatable One1

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Abstract
A method was developed to obtain a preparation of chicken gizzard heavy meromyosin (HMM) that retains the two light-chain components of parent myosin: the 20,000-dalton and 17,000-dalton light-chains. The HMM preparation was also shown to retain two characteristics of the ATPase activity of the parent myosin: the characteristic effect of phosphoryla tion of the 20,000-dalton light-chain component on the ATPase activity, and the characteristic dependence of the ATPase activity on the KCl concentration.