6 component system: The H+ or Na+-translocating NADH Dehydrogenase (NDH) Family
| Q729R3 | Hydrogenase, CooM subunit, putative |
|---|---|
| Q729R2 | Hydrogenase, CooK subunit, selenocysteine-containing, putative |
| Q729R1 | Hydrogenase, CooL subunit, putative |
| Q729R0 | Hydrogenase, CooX subunit, putative |
| Q729Q9 | Hydrogenase, CooU subunit, putative |
| Q729Q8 | Carbon monoxide-induced hydrogenase CooH, putative |