Table 2.

Actin-activated ATPase activity

Myosin	Vbasal†, s−1		Vmax‡, s−1		Km§, μM
	Unlabeled	Labeled	Unlabeled	Labeled	Unlabeled	Labeled
Muscle	0.10 ± 0.02	0.32 ± 0.13	13.5 ± 0.5	2.4 ± 0.2	13.8 ± 2.3	7.2 ± 0.3
Dicty	0.15 ± 0.03	0.42 ± 0.05	4.9 ± 0.8	1.9 ± 0.4	12.8 ± 1.8	8.8 ± 1.8

^†In the absence of actin.

^‡At saturating actin.

^§Actin concentration at which V = 0.5 V_max.