Table 2. Sequences associated with specific functions and taxa within the nitrogen cycle using KEGG pathways.
| Number of reads assigned | E.C Number | Orthology KEGG | Enzyme name | Gene | Organism | Class | E-value c |
| 14 | 1.7.99.4 | K00370 | nitrate reductase 1, alpha subunit | narG | Pseudomonas stutzeri | Gammaproteobacteria | 1 e–25 |
| Thiomonas itermedia | Betaproteobacteria | 4 e–41 | |||||
| Desulfococcus oleovorans | Deltaproteobacteria | 8 e–27 | |||||
| K00371 | nitrate reductase 1, beta subunit | narH | Thiomonas sp. | Betaproteobacteria | 6 e–35 | ||
| Oligotropha carboxidovorans | Alphaproteobacteria | 1 e–68 | |||||
| 1 e–26 | |||||||
| K00374 | nitrate reductase 1, gamma subunit | narI | Pseudomonas fluorescens | Gammaproteobacteria | 1 e–12 | ||
| 4 | 1.3.12.16 | K00459 | nitronate monooxygenase | Candidatus Koribacter versatilis | Acidobacteria | 7 e–16 | |
| Legionella pneumophila | Gammaproteobacteria | 6 e–18 | |||||
| 10 | 1.7.99.7 | K04561 | nitric-oxide reductase, cytochrome b-containing subunit I | norB | Legionella longbeachae | Gammaproteobacteria | 1 e–16 |
| Legionella pneumophila | 2 e–20 | ||||||
| 2 e–14 | |||||||
| K02164 | nitric-oxide reductase NorE protein | norE | Agrobacterium tumefaciens | Alphaproteobacteria | 8 e–46 | ||
| K02305 | nitric-oxide reductase, cytochrome c-containing subunit II | norC | Bradyrhizobium sp. | Alphaproteobacteria | 1 e–14 | ||
| K04748 | nitric-oxide reductase NorQ protein | norQ | Thiobacillus denitrificans | Betaproteobacteria | 1 e–54 | ||
| 2 | 1.7.99.6 | K00376 | nitrous-oxide reductase | nosZ | Magnetospirillum magneticum | Alphaproteobacteria | 6 e–28 |
| Cardiobacterium hominis | Gammaproteobacteria | 3 e–15 | |||||
| 7 | 1.18.6.1 | K02586 | nitrogenase molybdenum- iron protein alpha chain | nifD | Bradyrhizobium sp. | Alphaproteobacteria | 7 e–24 |
| K02591 | nitrogenase molybdenum- iron protein beta chain | nifK | Desulfitobacterium hafniense | Firmicutes | 8 e–31 | ||
| Thermodesulfovibrio yellowstonii | Nitrospira | 3 e–18 | |||||
| 4 | 1.7.1.4 | K00362 | nitrite reductase (NAD(P)H) large subunit | nirB * | Sphigomonas sp. | Alphaproteobacteria | 1 e–18 |
| 7 | 1.7.7.1 | K00366 | ferredoxin-nitrite reductase | nirA * | Candidatus Koribacter versatilis | Acidobacteria | 1 e–18 |
| Acidobacterium capsulatum | Acidobacteria | 7 e–26 | |||||
| Pseudochlorella sp. a | Trebouxiophyceae | 3 e–15 | |||||
| Thalassiosira pseudonana b | Coscinodiscophyceae | 3 e–15 | |||||
| Chthoniobacter flavus | Spartobacteria | 2 e–18 | |||||
| 2 | 1.7.2.1 | K00368 | nitrite reductase | nirS | Nitrosococcus halophilus | Gammaproteobacteria | 5 e–36 |
*
assimilatory nitrate reduction; a micro-algae; b diatom: c (cut-off E-value 1e -10).