Table 4. Genes coding for enzymes involved in denitrification and dissimilatory nitrate reduction to ammonia.
| Gene | Protein | EC no. | Accumulibacter | T. australiensis | T. elongata | T. jenkinsii | T. japonica |
|---|---|---|---|---|---|---|---|
| narI | Nitrate reductase (γ subunit) | 1.7.99.4 | − | + | + | + | + |
| narJ | Nitrate reductase (δ subunit) | 1.7.99.4 | − | + | + | + | + |
| narH | Nitrate reductase (β subunit) | 1.7.99.4 | − | + | + | + | + |
| narG | Nitrate reductase (α subunit) | 1.7.99.4 | − | + | + | + | + |
| napA | Nitrate reductase | 1.9.6.1 | + | − | − | − | + |
| nirB | Nitrite reductase, large subunit | 1.7.1.4 | + | − | − | − | + |
| nirD | Nitrite reductase, small subunit | 1.7.1.4 | + | − | − | − | + |
| nirK | Copper-containing nitrite reductase | 1.7.2.1 | − | + | + | + | + |
| norB | Nitric oxide reductase, large subunit | 1.7.99.7 | − | +a | − | − | +a |
| norC | Nitric oxide reductase, small subunit | 1.7.99.7 | − | − | − | − | − |
| norZ | Nitric oxide reductase | 1.7.99.7 | + | +a | − | − | +a |
| nosZ | Nitrous oxide reductase | 1.7.99.6 | + | − | − | − | − |
+, Candidate gene present in the genome; −, a candidate gene has not been identified in the genome.
a
norB and norZ have amino-acid identities of 90%. Therefore, this sequence may be either of these sequences.