Table 2.

ATP-to-ADP phosphate exchange activity of BchI

Assay	Subunits added and components missing	% radioactivity			nmol of ATP formed by phosphate transfer per min
		AMP	ADP	ATP
1	BchD + BchH + BchI	6.7	60.6	32.7	43.6
2	BchD	1.8	92.4	5.8	7.3
3	BchH	7.1	81.9	11.0	14.7
4	BchI	1.6	59.5	38.9	51.9
5	BchI − ATP	2.2	90.0	7.8	10.4
6	BchI − Mg2+	1.5	91.5	7.0	9.3

Protein (μg per assay): BchD, 33; BchH, 210; BchI, 90.