| EC:1.1.99.19 Uracil dehydrogenase. | TG | PF | CP | HS |
| EC:1.3.1.1 Dihydrouracil dehydrogenase (NAD+). | TG | PF | CP | HS |
| EC:1.3.1.2 Dihydropyrimidine dehydrogenase (NADP+). | TG | PF | CP | HS |
| EC:1.3.1.14 Orotate reductase (NADH). | TG | PF | CP | HS |
| EC:1.3.3.1 Dihydroorotate oxidase. | TG | PF | CP | HS |
| EC:1.3.99.11 Dihydroorotate dehydrogenase. | TG | PF | CP | HS |
| EC:1.8.1.9 Thioredoxin-disulfide reductase. | TG | PF | CP | HS |
| EC:1.17.4.1 Ribonucleoside-diphosphate reductase. | TG | PF | CP | HS |
| EC:1.17.4.2 Ribonucleoside-triphosphate reductase. | TG | PF | CP | HS |
| EC:2.1.1.45 Thymidylate synthase. | TG | PF | CP | HS |
| EC:2.1.1.148 Thymidylate synthase (FAD). | TG | PF | CP | HS |
| EC:2.1.2.8 Deoxycytidylate hydroxymethyltransferase. | TG | PF | CP | HS |
| EC:2.1.3.2 Aspartate carbamoyltransferase. | TG | PF | CP | HS |
| EC:2.4.2.1 Purine-nucleoside phosphorylase. | TG | PF | CP | HS |
| EC:2.4.2.2 Pyrimidine-nucleoside phosphorylase. | TG | PF | CP | HS |
| EC:2.4.2.3 Uridine phosphorylase. | TG | PF | CP | HS |
| EC:2.4.2.4 Thymidine phosphorylase. | TG | PF | CP | HS |
| EC:2.4.2.6 Nucleoside deoxyribosyltransferase. | TG | PF | CP | HS |
| EC:2.4.2.9 Uracil phosphoribosyltransferase. | TG | PF | CP | HS |
| EC:2.4.2.10 Orotate phosphoribosyltransferase. | TG | PF | CP | HS |
| EC:2.4.2.23 Deoxyuridine phosphorylase. | TG | PF | CP | HS |
| EC:2.7.1.21 Thymidine kinase. | TG | PF | CP | HS |
| EC:2.7.1.48 Uridine kinase. | TG | PF | CP | HS |
| EC:2.7.1.74 Deoxycytidine kinase. | TG | PF | CP | HS |
| EC:2.7.1.83 Pseudouridine kinase. | TG | PF | CP | HS |
| EC:2.7.4.4 Nucleoside-phosphate kinase. | TG | PF | CP | HS |
| EC:2.7.4.6 Nucleoside-diphosphate kinase. | TG | PF | CP | HS |
| EC:2.7.4.9 Thymidylate kinase. | TG | PF | CP | HS |
| EC:2.7.4.10 Nucleoside-triphosphate--adenylate kinase. | TG | PF | CP | HS |
| EC:2.7.4.14 Cytidylate kinase. | TG | PF | CP | HS |
| EC:2.7.7.6 DNA-directed RNA polymerase. | TG | PF | CP | HS |
| EC:2.7.7.7 DNA-directed DNA polymerase. | TG | PF | CP | HS |
| EC:2.7.7.8 Polyribonucleotide nucleotidyltransferase. | TG | PF | CP | HS |
| EC:2.7.7.- | TG | PF | CP | HS |
| EC:3.1.3.5 5'-nucleotidase. | TG | PF | CP | HS |
| EC:3.1.3.6 3'-nucleotidase. | TG | PF | CP | HS |
| EC:3.1.4.16 2',3'-cyclic-nucleotide 2'-phosphodiesterase. | TG | PF | CP | HS |
| EC:3.2.2.3 Uridine nucleosidase. | TG | PF | CP | HS |
| EC:3.2.2.8 Ribosylpyrimidine nucleosidase. | TG | PF | CP | HS |
| EC:3.2.2.10 Pyrimidine-5'-nucleotide nucleosidase. | TG | PF | CP | HS |
| EC:3.5.1.6 Beta-ureidopropionase. | TG | PF | CP | HS |
| EC:3.5.2.1 Barbiturase. | TG | PF | CP | HS |
| EC:3.5.2.2 Dihydropyrimidinase. | TG | PF | CP | HS |
| EC:3.5.2.3 Dihydroorotase. | TG | PF | CP | HS |
| EC:3.5.4.1 Cytosine deaminase. | TG | PF | CP | HS |
| EC:3.5.4.5 Cytidine deaminase. | TG | PF | CP | HS |
| EC:3.5.4.12 dCMP deaminase. | TG | PF | CP | HS |
| EC:3.5.4.13 dCTP deaminase. | TG | PF | CP | HS |
| EC:3.5.4.14 Deoxycytidine deaminase. | TG | PF | CP | HS |
| EC:3.6.1.2 Trimetaphosphatase. | TG | PF | CP | HS |
| EC:3.6.1.5 Apyrase. | TG | PF | CP | HS |
| EC:3.6.1.6 Nucleoside-diphosphatase. | TG | PF | CP | HS |
| EC:3.6.1.8 ATP diphosphatase. | TG | PF | CP | HS |
| EC:3.6.1.12 dCTP diphosphatase. | TG | PF | CP | HS |
| EC:3.6.1.17 Bis(5'-nucleosyl)-tetraphosphatase (asymmetrical). | TG | PF | CP | HS |
| EC:3.6.1.19 Nucleoside-triphosphate diphosphatase. | TG | PF | CP | HS |
| EC:3.6.1.23 dUTP diphosphatase. | TG | PF | CP | HS |
| EC:3.6.1.39 Thymidine-triphosphatase. | TG | PF | CP | HS |
| EC:4.1.1.23 Orotidine-5'-phosphate decarboxylase. | TG | PF | CP | HS |
| EC:4.2.1.70 Pseudouridylate synthase. | TG | PF | CP | HS |
| EC:6.3.4.2 CTP synthase. | TG | PF | CP | HS |
| EC:6.3.5.5 Carbamoyl-phosphate synthase (glutamine-hydrolyzing). | TG | PF | CP | HS |