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- W1539348211 abstract "The actin-activated ATPase activities of myosin minifilaments and heavy meromyosin are similar at high actin concentrations. Under low ionic strength conditions, the minifilaments in Tris citrate buffer yield the same maximal turnover rate (Vmax) and apparent dissociation constant of actin from myosin (Kapp) as heavy meromyosin in standard low salt conditions. The time course of actin-activated ATP hydrolysis of minifilaments is similar to that observed for standard myosin preparations. Depending on the exact protein composition of the assay mixture, either the ATPase activity declines continuously with time, or is accelerated at the onset of superprecipitation. In analogy with myosin filaments, the ATPase of minifilaments shows a biphasic dependence on actin concentration. Super-precipitation of minifilaments follows a well resolved clearing phase during which their structural integrity appears to be fully preserved. These results indicate that minifilaments or similar small assemblies of myosin can fulfill contractile functions." @default.
- W1539348211 created "2016-06-24" @default.
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- W1539348211 date "1983-04-01" @default.
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- W1539348211 title "The actomyosin ATPase of synthetic myosin minifilaments, filaments, and heavy meromyosin." @default.
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- W1539348211 doi "https://doi.org/10.1016/s0021-9258(18)32534-1" @default.
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