Table 2.

Steady-state kinetic parameters measured for IFI, IFI-3a, EMB, and EMB-3b Drosophila myosin S1

Values are mean ± S.D. based on a minimum of four preparations (except for EMB Ca-ATPase, which is three).

Myosin S1	Basal Ca-ATPase (s−1)	Basal Mg-ATPase (s−1)	Vmax (s−1)	Km (μm)
IFI	9.79 ± 1.39	0.092 ± 0.035	1.25 ± 0.29	3.26 ± 2.36
IFI-3a	4.92 ± 1.05a	0.066 ± 0.047	1.07 ± 0.26	2.38 ± 0.91
EMB-3b	5.16 ± 2.01b	0.053 ± 0.039	0.83 ± 0.37	2.95 ± 2.95
EMB	1.83 ± 0.08	0.016 ± 0.002ǂ	0.67 ± 0.06ǂ	2.54 ± 0.46ǂ

^ǂData from Ref. 10.

^aStatistically different compared with IFI, p < 0.0001.

^bStatistically different compared with EMB, p < 0.05.