Structure of PDB 1rb3 Chain B

Receptor sequence
>1rb3B (length=159) Species: 562 (Escherichia coli) [Search protein sequence]
MISLIAALAVDRVIGMENAMPWNLPADLAWFKRNTLDKPVIMGRHTWESI
GRPLPGRKNIILSSQPGTDDRVTWVKSVDEAIAACGDVPEIMVIGGGRVY
EQFLPKAQKLYLTHIDAEVEGDTHFPDYEPDDWESVFSEFHDADAQNSHS
YCFEILERR
3D structure
PDB1rb3 Loop and subdomain movements in the mechanism of Escherichia coli dihydrofolate reductase: crystallographic evidence.
ChainB
Resolution2.3 Å
3D
structure
Catalytic site residues are labeled in the structure
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Enzymatic activity
Catalytic site (original residue number in PDB) I5 M20 W22 D27 L28 F31 L54 I91 T113
Catalytic site (residue number reindexed from 1) I5 M20 W22 D27 L28 F31 L54 I91 T113
Enzyme Commision number 1.5.1.3: dihydrofolate reductase.
Interaction with ligand
Site
#		 Ligand Ligand
chain		 Binding residues on receptor
(original residue number in PDB)		 Binding residues on receptor
(residue number reindexed from 1)		 Binding affinity
BS01 MTX B I5 A6 D27 F31 L54 R57 I5 A6 D27 F31 L54 R57 BindingDB: IC50=8.8nM,EC50=1nM
BS02 NAP B M16 G43 R44 H45 T46 S63 S64 K76 G96 G97 R98 Q102 D122 M16 G43 R44 H45 T46 S63 S64 K76 G96 G97 R98 Q102 D122
Gene Ontology
Molecular Function
GO:0004146 dihydrofolate reductase activity
GO:0005515 protein binding
GO:0005542 folic acid binding
GO:0016491 oxidoreductase activity
GO:0050661 NADP binding
GO:0051870 methotrexate binding
GO:0051871 dihydrofolic acid binding
GO:0070401 NADP+ binding
GO:0070402 NADPH binding
Biological Process
GO:0006730 one-carbon metabolic process
GO:0009257 10-formyltetrahydrofolate biosynthetic process
GO:0009410 response to xenobiotic stimulus
GO:0031427 response to methotrexate
GO:0046452 dihydrofolate metabolic process
GO:0046654 tetrahydrofolate biosynthetic process
GO:0046655 folic acid metabolic process
GO:0046656 folic acid biosynthetic process
GO:0046677 response to antibiotic
Cellular Component
GO:0005829 cytosol

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Molecular Function
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Biological Process
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Cellular Component
External links
PDB RCSB:1rb3, PDBe:1rb3, PDBj:1rb3
PDBsum1rb3
PubMed9012674
UniProtP0ABQ4|DYR_ECOLI Dihydrofolate reductase (Gene Name=folA)

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