TABLE 3.

NOR and oxidase activities in membranes prepared from E. coli JM109 expressing wild-type or mutant forms of NOR

Plasmids present	NOR expresseda	NOR activity (nmol of NO mg of protein−1 min−1)	Oxidase activity (nmol of O mg of protein−1 min−1)
None	None	<5
pEC86	None	<5
pEC86, pNOREX	Wild type	470	40
pEC86, p125EX	E125A	20	2
pEC86, p198EX	E198A	<5	<1
pEC86, p202EX	E202A	140	30
pEC86, p198202EX	E198A/E202A	<5	<1

^aE125A, NOR^E125A (similar for E198A and E202A).