Class I | Class II | Class III | |
---|---|---|---|
Operation | Aerobic | Oxygen independent | Anaerobic |
Structure | α2 β2 | α or α2 | α2 |
Subunit names | Ia: NrdA, NrdB | NrdJ | NrdD |
Ib: NrdE, NrdF | specific activase: NrdG | ||
Radical/cofactor | Tyr122 (in β) | AdoCbl | Gly580 (in α) |
Reductant | Ia: Thioredoxin/Glutaredoxin | Thioredoxin | Formate |
Ib: NrdH-redoxin | |||
In archaea | Limited distribution | Yes | Yes |
In bacteria | Yes | Yes | Yes |
In eukaryotes | Yes | Limited distribution | Limited distribution |
In virusesa | Yes | Bacteriophage; one eukaryotic virus | Bacteriophage |