Table 1.

Ni-enzyme activities of Helicobacter pylori accessory protein mutants

Strain	Hydrogenase activitya	Urease activityb
Wild type	1.4 ± 0.3	64 ± 23
HypA	<0.01	0.3 ± 0.1
HypB	<0.01	1.6 ± 0.5
HypC	<0.01	62 ± 19
HypD	<0.01	71 ± 11
HypE	<0.01	76 ± 17
HypF	<0.01	78 ± 14
hypA:kanHA	1.2 ± 0.3	62 ± 8

^anmol H₂ oxid per min per 10⁸ cells

^bµmole urea hydrolyzed per min per mg protein

Urease activity of hypA and hypB strains was fully restored by adding 5 µM nickel. Data is from Olson et al. 2001, Mehta et al. 2003a and Benoit et al. 2004