| IPR046342 | CBS domain superfamily | Homologous Superfamily |
| IPR001216 | Cysteine synthase/cystathionine beta-synthase, pyridoxal-phosphate attachment site | Binding Site |
| IPR046353 | Cystathionine beta-synthase, C-terminal domain | Domain |
| IPR036052 | Tryptophan synthase beta chain-like, PALP domain superfamily | Homologous Superfamily |
| IPR005857 | Cystathionine beta-synthase | Family |
| IPR050214 | Cysteine synthase/Cystathionine beta-synthase | Family |
| IPR001926 | Tryptophan synthase beta chain-like, PALP domain | Domain |
| IPR000644 | CBS domain | Domain |