TABLE 1.

S1 ATPase activity

	Actin-activated ATPase			High salt ATPase
Protein	Vmax	Km	Mg2+− ATPase, V0	VCa/K	VK/EDTA
S1	13.1 ± 0.5 s−1	13.8 ± 2.3 μM	0.10 ± 0.02 s−1	1.0 ± 0.1 s−1	8.5 ± 0.5 s−1
IASL-S1	2.4 ± 0.2 s−1	7.2 ± 0.3 μM	0.32 ± 0.13 s−1	11.2 ± 1.3 s−1	1.4 ± 0.3 s−1
IASL-S1.ADP.Vi	–	–	0.006 s−1	–	–