Functional Information from GO Data
| Chain | GOid | namespace | contents | 
| A | 0004146 | molecular_function | dihydrofolate reductase activity | 
| A | 0005515 | molecular_function | protein binding | 
| A | 0005542 | molecular_function | folic acid binding | 
| A | 0005829 | cellular_component | cytosol | 
| A | 0006730 | biological_process | one-carbon metabolic process | 
| A | 0009257 | biological_process | 10-formyltetrahydrofolate biosynthetic process | 
| A | 0009410 | biological_process | response to xenobiotic stimulus | 
| A | 0016491 | molecular_function | oxidoreductase activity | 
| A | 0031427 | biological_process | response to methotrexate | 
| A | 0044281 | biological_process | small molecule metabolic process | 
| A | 0046452 | biological_process | dihydrofolate metabolic process | 
| A | 0046654 | biological_process | tetrahydrofolate biosynthetic process | 
| A | 0046655 | biological_process | folic acid metabolic process | 
| A | 0046656 | biological_process | folic acid biosynthetic process | 
| A | 0046677 | biological_process | response to antibiotic | 
| A | 0050661 | molecular_function | NADP binding | 
| A | 0051870 | molecular_function | methotrexate binding | 
| A | 0051871 | molecular_function | dihydrofolic acid binding | 
| A | 0070401 | molecular_function | NADP+ binding | 
| A | 0070402 | molecular_function | NADPH binding | 
Functional Information from PDB Data
| site_id | AC1 | 
| Number of Residues | 15 | 
| Details | BINDING SITE FOR RESIDUE FOL A 161 | 
| Chain | Residue | 
| A | ILE5 | 
| A | THR113 | 
| A | NAP164 | 
| A | HOH302 | 
| A | HOH601 | 
| A | HOH625 | 
| A | HOH711 | 
| A | ALA6 | 
| A | ALA7 | 
| A | ASP27 | 
| A | LEU28 | 
| A | PHE31 | 
| A | LYS32 | 
| A | ARG57 | 
| A | ILE94 | 
| site_id | AC2 | 
| Number of Residues | 30 | 
| Details | BINDING SITE FOR RESIDUE NAP A 164 | 
| Chain | Residue | 
| A | ALA6 | 
| A | ALA7 | 
| A | ILE14 | 
| A | GLY15 | 
| A | MET16 | 
| A | GLY43 | 
| A | ARG44 | 
| A | HIS45 | 
| A | THR46 | 
| A | LEU62 | 
| A | SER63 | 
| A | SER64 | 
| A | LYS76 | 
| A | ILE94 | 
| A | GLY95 | 
| A | GLY96 | 
| A | GLY97 | 
| A | ARG98 | 
| A | VAL99 | 
| A | TYR100 | 
| A | GLN102 | 
| A | FOL161 | 
| A | HOH307 | 
| A | HOH353 | 
| A | HOH461 | 
| A | HOH605 | 
| A | HOH606 | 
| A | HOH651 | 
| A | HOH700 | 
| A | HOH708 | 
Functional Information from PROSITE/UniProt
| site_id | PS00075 | 
| Number of Residues | 23 | 
| Details | DHFR_1 Dihydrofolate reductase (DHFR) domain signature. VIGmenaMPWnlpa.DlawFkrnT | 
| Chain | Residue | Details | 
| A | VAL13-THR35 |  | 
Functional Information from SwissProt/UniProt
| site_id | SWS_FT_FI1 | 
| Number of Residues | 157 | 
| Details | Domain: {"description":"DHFR","evidences":[{"source":"PROSITE-ProRule","id":"PRU00660","evidenceCode":"ECO:0000255"}]} | 
| site_id | SWS_FT_FI2 | 
| Number of Residues | 5 | 
| Details | Binding site: {"evidences":[{"source":"PubMed","id":"9012674","evidenceCode":"ECO:0000305"}]} | 
| site_id | SWS_FT_FI3 | 
| Number of Residues | 17 | 
| Details | Binding site: {"evidences":[{"source":"PubMed","id":"19374017","evidenceCode":"ECO:0000269"}]} | 
Catalytic Information from CSA
| site_id | CSA1 | 
| Number of Residues | 7 | 
| Details | a catalytic site defined by CSA, PubMed 2185835, 1290933 | 
| Chain | Residue | Details | 
| A | LEU54 |  | 
| A | LEU28 |  | 
| A | PHE31 |  | 
| A | ASP27 |  | 
| A | ILE5 |  | 
| A | MET20 |  | 
| A | ILE94 |  |