Table 1.

The Aeh1 NrdA-a/NrdA-b/NrdB complex has high enzyme activity

Added protein	Specific enzyme activity, units/mg
	Aeh1 NrdA-a/NrdA-b	Aeh1 NrdB
Aeh1 NrdA-a/NrdA-b	0.8*	94 ± 1
Aeh1 NrdB	94 ± 1	0.3*
A. hydrophila NrdA	n.a.	2.4 ± 0.3†
E. coli NrdA	n.a.	1.3 ± 0.02
E. coli NrdB	0.5 ± 0.01	n.a.

Amounts of protein used were 4 μg of Aeh1 NrdA-a/NrdA-b, Aeh1 NrdB, A. hydrophila NrdA, and E. coli NrdB, and 1 μg of E. coli NrdA. n.a., not applicable.

*Background enzyme activity of 4 μg of Aeh1 NrdA-a/NrdA-b, or 4 μg of Aeh1 NrdB.

^†Background activity of 4 μg of A. hydrophila NrdA was 1.8 units/mg.