Table 1. Cleavage activity of the S.cerevisiae, DH1-1A and C.tropicalis substrates^a.

Target site	Mg2+		Mn2+
	Activity (×10–2)b	Relative activityc	Activity (×10–2)b	Relative activityc
Saccharomyces cerevisiae endonuclease
S.cerevisiae	2.6 ± 0.3	1	11.5 ± 1	1
DH1-1A	0.28 ± 0.03	0.1	9.4 ± 0.7	0.8
C.tropicalis	0.32± 0.03	0.1	7.7 ± 0.2	0.7
DH1-1A endonuclease
DH1-1A	<0.01	<0.01	14.4 ± 0.2	1.3

^aValues represent means ± SD from at least three experiments.

^bUnits are M DNA cleaved/(min × M enzyme).

^cRelative activity is the ratio of the DH1-1A or C.tropicalis to S.cerevisiae values.