| Domain | Name | Category | Type |
| IPR000183 | Ornithine/DAP/Arg decarboxylase | Family | Family |
| IPR002433 | Ornithine decarboxylase | Family | Family |
| IPR009006 | Alanine racemase/group IV decarboxylase, C-terminal | Family | Homologous superfamily |
| IPR022643 | Orn/DAP/Arg decarboxylase 2, C-terminal | Domain | Domain |
| IPR022644 | Orn/DAP/Arg decarboxylase 2, N-terminal | Domain | Domain |
| IPR022653 | Orn/DAP/Arg decarboxylase 2, pyridoxal-phosphate binding site | Site | Binding site |
| IPR022657 | Orn/DAP/Arg decarboxylase 2, conserved site | Site | Conserved site |
| IPR029066 | PLP-binding barrel | Family | Homologous superfamily |