| EC:1.4.3.2 L-amino acid oxidase. | TG | PF | CP | HS |
| EC:1.8.4.1 Glutathione--homocystine transhydrogenase. | TG | PF | CP | HS |
| EC:1.8.4.5 Methionine-S-oxide reductase. | TG | PF | CP | HS |
| EC:2.1.1.5 Betaine--homocysteine S-methyltransferase. | TG | PF | CP | HS |
| EC:2.1.1.10 Homocysteine S-methyltransferase. | TG | PF | CP | HS |
| EC:2.1.1.13 Methionine synthase. | TG | PF | CP | HS |
| EC:2.1.1.14 5-methyltetrahydropteroyltriglutamate--homocysteine S-methyltransferase. | TG | PF | CP | HS |
| EC:2.1.1.37 DNA (cytosine-5-)-methyltransferase. | TG | PF | CP | HS |
| EC:2.1.2.9 Methionyl-tRNA formyltransferase. | TG | PF | CP | HS |
| EC:2.3.1.31 Homoserine O-acetyltransferase. | TG | PF | CP | HS |
| EC:2.3.1.46 Homoserine O-succinyltransferase. | TG | PF | CP | HS |
| EC:2.5.1.6 Methionine adenosyltransferase. | TG | PF | CP | HS |
| EC:2.5.1.48 Cystathionine gamma-synthase. | TG | PF | CP | HS |
| EC:2.5.1.49 O-acetylhomoserine aminocarboxypropyltransferase. | TG | PF | CP | HS |
| EC:3.2.1.148 Ribosylhomocysteinase. | TG | PF | CP | HS |
| EC:3.2.2.9 Adenosylhomocysteine nucleosidase. | TG | PF | CP | HS |
| EC:3.3.1.1 Adenosylhomocysteinase. | TG | PF | CP | HS |
| EC:3.4.13.12 Met-Xaa dipeptidase. | TG | PF | CP | HS |
| EC:3.5.1.31 Formylmethionine deformylase. | TG | PF | CP | HS |
| EC:4.2.1.22 Cystathionine beta-synthase. | TG | PF | CP | HS |
| EC:4.4.1.1 Cystathionine gamma-lyase. | TG | PF | CP | HS |
| EC:4.4.1.8 Cystathionine beta-lyase. | TG | PF | CP | HS |
| EC:6.1.1.10 Methionine--tRNA ligase. | TG | PF | CP | HS |