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. 2012 May 5;367(1593):1157–1168. doi: 10.1098/rstb.2011.0415

Table 1.

The genes and enzymes that carry out the bacterial nitrogen cycle.

transformation genes encoding enzyme references
N2 → NH3 nifHDK nitrogenase [13]
Inline graphic narG dissimilatory nitrate reductase [14]
Inline graphic nirS, nirK nitrite reductase haem cd1 and copper nitrite reductase [15]
NO → N2O norCB nitric oxide reductase [16,17]
N2O → N2 nosZ nitrous oxide reductase [1820]
Inline graphic amo, hao ammonia monooxygenase, hydroxylamine oxidoreductase [21,22]
Inline graphic narB, nasA assimilatory nitrate reductase [23]
Inline graphic Nir assimilatory nitrite reductase [24]
NH3 assimilation glnA glutamine synthetase [25]
organic N metabolism ure urease [26]