| Domain | Name | Category | Type |
| IPR001254 | Serine proteases, trypsin domain | Domain | Domain |
| IPR001314 | Peptidase S1A, chymotrypsin family | Family | Family |
| IPR002172 | Low-density lipoprotein (LDL) receptor class A repeat | Repeat | Repeat |
| IPR009003 | Peptidase S1, PA clan | Family | Homologous superfamily |
| IPR017324 | Transmembrane protease serine 9 | Family | Family |
| IPR018114 | Serine proteases, trypsin family, histidine active site | Site | Active site |
| IPR033116 | Serine proteases, trypsin family, serine active site | Site | Active site |
| IPR036055 | LDL receptor-like superfamily | Family | Homologous superfamily |
| IPR043504 | Peptidase S1, PA clan, chymotrypsin-like fold | Family | Homologous superfamily |