Unphosphorylated calf thymus and aorta myosins contract ghost myofibrils.

Abstract

The MgATPase activity of unphosphorylated gizzard myosin is not stimulated by actin, but the MgATPase activities of unphosphorylated calf thymus and calf aorta myosins are stimulated by actin. This suggested that unphosphorylated thymus and aorta myosins, but not unphosphorylated gizzard myosin, should be able to cause movement. The contractile activities… (More)

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