| Domain | Name | Category | Type |
| IPR000358 | Ribonucleotide reductase small subunit family | Family | Family |
| IPR009078 | Ferritin-like superfamily | Family | Homologous superfamily |
| IPR012348 | Ribonucleotide reductase-like | Family | Homologous superfamily |
| IPR030475 | Ribonucleotide reductase small subunit, acitve site | Site | Active site |
| IPR033909 | Ribonucleotide reductase small subunit | Family | Family |