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- W2115804568 abstract "A kinetic study of the ATPase reactions catalyzed by myosin and actomyosin was carried out by varying the concentrations of ATP and 2,4-dinitrophenol (DNP). Mg-ATPase of myosin in the initial burst and that of actomyosin were both inhibited competitively by DNP. The dissociation contants for the DNP-myosin interaction (Ki) were estimated to be very similar, that is, 4.2 mM in the initial burst of ATP splitting, and 3.3 mM for the actomyosin ATPase. It is therefore suggested that DNP acts at the same site when it inhibits the burst splitting of ATP and the actomyosin ATPase. In contrast, Mg,-Ca-, and EDTA-ATPase activities of myosin in the steady state were all affected uncompetitively by DNP. Moreover, the Ki value for Mg-ATPase of myosin in the steady state was found to be 31 mM, which is much higher than those mentioned above for the initial burst and actomyosin ATPase. It is therefore suggested that the site at which DNP acts to inhibit the burst splitting of ATP is different from the site at which DNP acts to affect Mg-, Ca-, and EDTA-ATPases in the steady state." @default.
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- W2115804568 date "1977-09-01" @default.
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- W2115804568 title "Competitive and Uncompetitive Effects of 2,4-Dinitrophenol on ATPase Activities of Rabbit Skeletal Actomyosin and Myosin1" @default.
- W2115804568 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a131766" @default.
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