The adenosine triphosphatase activity of the meromyosins
Copyright policy )The adenosine triphosphatase activity of the meromyosins
Abstract 1. 1.|Mg 2+ does not activate the ATPase (ATP phosphohydrolase, EC 3.6.1.3) of actin-heavy meromyosin complex (acto-HMM) at low ionic strength. 2. 2.|The interaction inhibitor heparin, which dissociates actomyosin and inhibits its ATPase activity, also inhibits the ATPase of acto-HMM. 3. 3.|Acto-HMM does not show Ca 2+ sensitivity, i.e. its ATPase activity is not inhibited by the removal of Ca 2+ with ethyleneglycol-bis(aminoethyl)-tetraacetic acid. 4. 4.|The enzymic characteristics of the ATPase-active component of light meromyosin (LMM) preparations are the same as those of heavy meromyosin (HMM). 5. 5.|The ATPase-active component of LMM preparations can be removed from the preparation by ultracentrifugation in the presence of actin in 0.5 M KCl.
- Eötvös Loránd University Hungary
Adenosine Triphosphatases, Heparin, Muscle Proteins, Calcium, Magnesium, Ultracentrifugation
Adenosine Triphosphatases, Heparin, Muscle Proteins, Calcium, Magnesium, Ultracentrifugation
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