TABLE 3.
Numbers of hydrogenase genes and their relative abundance in geothermal soils of the Favara Grande
| Type of hydrogenasea | No. of genes | Relative abundance of genes (%) |
|---|---|---|
| [NiFe] Evolving | 192 | 65 |
| [NiFe] Anaerobic uptake | 10 | 20 |
| [FeFe] Hydrogenase | 187 | 7 |
| [NiFe] Bidirectional | 42 | 6 |
| [NiFe] Aerobic uptake | 8 | 2 |
a
The [NiFe]-aerobic uptake hydrogenases only include subgroup 2a, [NiFe]-anaerobic uptake hydrogenases include subgroups 1b, 1c, 1f, and 1k, [NiFe]-bidirectional includes 3b and 3d, the [NiFe]-evolving hydrogenases include groups 4a, 4b, 4e, 4f, and 4g, and [FeFe]-hydrogenases include groups A, B, and C. The remaining subgroup, including groups 1a, 1d, 1e, 1g, 1h/5, 2b, 2c, 2d, 3a, 3c, 4c, and 4d and [Fe]-hydrogenases, were not identified within this metagenome.