Table 3.

Parameter estimates from Hill fits to velocity-pCa data for the effect of dATP

pH	ATP	pCa50	Hill	R2
7.4	normal	6.71 ± 0.07	2.02 ± 0.37	0.86
	2-deoxy	6.95 ± 0.06	4.31 ± 1.43	0.87
6.8	normal	6.71 ± 0.07	1.76 ± 0.45	0.83
	2-deoxy	6.52 ± 0.02‡	4.47 ± 2.01	0.88
6.5	normal	4.55 ± 0.24†*	4.57 ± 12.1	0.22
	2-deoxy	6.30 ± 0.03‡	4.09 ± 2.84	0.77

Values represent means ± SE for filaments reconstituted with WT Tn.

^*Indicates significantly different from pH 6.5 in 2-deoxy ATP (dATP). †Indicates significantly different from pH 7.4 and 6.8 with normal ATP.

^‡Indicates significantly different from pH 7.4 in dATP.