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Regulation of actin-activated myosin 5 ATPase activity by GST-GTD dimers. a, myosin 5 HMM; solid circles at nanomolar calcium, open circles with 0.1 mM free calcium. Fitted line gives Ki 0.75μM. b, myosin 5 S1 at nanomolar calcium, squares and circles represent independent experiments. Ca2+ did not greatly affect the Km values for actin activation of HMM MgATPase which were generally in the range of 0.3-0.7 μM in the presence of 50 mM KCl.
