| Domain | Name | Category | Type |
| IPR000816 | Peptidase C15, pyroglutamyl peptidase I | Family | Family |
| IPR016125 | Peptidase C15, pyroglutamyl peptidase I-like | Family | Family |
| IPR029761 | Pyroglutamyl peptidase I, metazoa | Family | Family |
| IPR033693 | Pyroglutamyl peptidase I, Glu active site | Site | Active site |
| IPR033694 | Pyroglutamyl peptidase I, Cys active site | Site | Active site |
| IPR036440 | Peptidase C15, pyroglutamyl peptidase I-like superfamily | Family | Homologous superfamily |