| Domain | Name | Category | Type |
| IPR000594 | THIF-type NAD/FAD binding fold | Domain | Domain |
| IPR018074 | Ubiquitin-activating enzyme E1, conserved site | Site | Conserved site |
| IPR023318 | Ubiquitin activating enzyme, alpha domain superfamily | Family | Homologous superfamily |
| IPR028077 | Ubiquitin/SUMO-activating enzyme ubiquitin-like domain | Domain | Domain |
| IPR030661 | SUMO-activating enzyme subunit Uba2 | Family | Family |
| IPR032426 | SUMO-activating enzyme subunit 2, C-terminal domain | Domain | Domain |
| IPR033127 | Ubiquitin-activating enzyme E1, Cys active site | Site | Active site |
| IPR035985 | Ubiquitin-activating enzyme | Family | Homologous superfamily |