TABLE 1.

Rates of ATP (or dATP) hydrolysis^a

Activity and pHs	Rate of hydrolysis (μM/min)
	dsDNA-dependent	During strand exchange	ssDNA-dependent
ATP hydrolysis
pH 7.5	15.5	15.7	11.5
pH 8.1	3.6	10.2	8.3
dATP hydrolysis
pH 7.5	16.9	21.5	30
pH 8.1	20.3	26.9	28

^aReaction conditions: 5 μM φX circular ssDNA, 10 μM φX linear dsDNA, 2 μM RecA_Dr, 0.5 μM E. coli. SSB, and 2 mM ATP (or dATP).