1RB3

DIHYDROFOLATE REDUCTASE COMPLEXED WITH METHOTREXATE AND NICOTINAMIDE ADENINE DINUCLEOTIDE PHOSPHATE (OXIDIZED FORM)

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1rb3a_	Alpha and beta proteins (a/b)	Dihydrofolate reductase-like	Dihydrofolate reductase-like	Dihydrofolate reductases	Dihydrofolate reductase, prokaryotic type	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
B	d1rb3b_	Alpha and beta proteins (a/b)	Dihydrofolate reductase-like	Dihydrofolate reductase-like	Dihydrofolate reductases	Dihydrofolate reductase, prokaryotic type	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Dihydrofolate reductase-like	8032695	3001255	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Dihydrofolate reductase-like	8032695	3001255	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	DHFR_1	e1rb3A1	A: a/b three-layered sandwiches	X: Dihydrofolate reductases (From Topology)	H: Dihydrofolate reductases (From Topology)	T: Dihydrofolate reductases	F: DHFR_1	ECOD (1.6)
B	DHFR_1	e1rb3B1	A: a/b three-layered sandwiches	X: Dihydrofolate reductases (From Topology)	H: Dihydrofolate reductases (From Topology)	T: Dihydrofolate reductases	F: DHFR_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.430.10	Alpha Beta	3-Layer(aba) Sandwich	Dihydrofolate Reductase, subunit A	Dihydrofolate Reductase, subunit A	CATH (4.3.0)
B	3.40.430.10	Alpha Beta	3-Layer(aba) Sandwich	Dihydrofolate Reductase, subunit A	Dihydrofolate Reductase, subunit A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00186	Dihydrofolate reductase (DHFR_1)	Dihydrofolate reductase	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	DIHYDROFOLATE REDUCTASE	amide binding organic acid binding binding ion binding organic cyclic compound binding anion binding carboxylic acid binding heterocyclic compound binding methotrexate binding small molecule binding NADP+ binding nucleotide binding nucleoside phosphate binding purine nucleotide binding amide binding organic acid binding binding ion binding organic cyclic compound binding anion binding carboxylic acid binding heterocyclic compound binding methotrexate binding small molecule binding NADP+ binding nucleotide binding nucleoside phosphate binding purine nucleotide binding adenyl nucleotide binding NADP binding dihydrofolic acid binding modified amino acid binding NADPH binding vitamin binding folic acid binding dihydrofolate reductase activity oxidoreductase activity oxidoreductase activity, acting on the CH-NH group of donors, NAD or NADP as acceptor oxidoreductase activity, acting on the CH-NH group of donors catalytic activity	response to stimulus response to chemical response to xenobiotic stimulus response to methotrexate response to oxygen-containing compound response to nitrogen compound response to organic cyclic compound cellular metabolic process small molecule metabolic process metabolic process cellular process one-carbon metabolic process oxoacid metabolic process dicarboxylic acid metabolic process response to stimulus response to chemical response to xenobiotic stimulus response to methotrexate response to oxygen-containing compound response to nitrogen compound response to organic cyclic compound cellular metabolic process small molecule metabolic process metabolic process cellular process one-carbon metabolic process oxoacid metabolic process dicarboxylic acid metabolic process dihydrofolate metabolic process carboxylic acid metabolic process organic acid metabolic process cellular modified amino acid metabolic process folic acid-containing compound metabolic process pteridine-containing compound metabolic process vitamin metabolic process amide metabolic process water-soluble vitamin metabolic process folic acid metabolic process response to antibiotic cellular biosynthetic process vitamin biosynthetic process organic acid biosynthetic process carboxylic acid biosynthetic process dicarboxylic acid biosynthetic process folic acid biosynthetic process folic acid-containing compound biosynthetic process water-soluble vitamin biosynthetic process small molecule biosynthetic process amide biosynthetic process biosynthetic process cellular modified amino acid biosynthetic process pteridine-containing compound biosynthetic process tetrahydrofolate biosynthetic process tetrahydrofolate metabolic process 10-formyltetrahydrofolate metabolic process 10-formyltetrahydrofolate biosynthetic process	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR017925	Dihydrofolate reductase conserved site	Conserved Site
A, B	IPR012259	Dihydrofolate reductase	Family
A, B	IPR024072	Dihydrofolate reductase-like domain superfamily	Homologous Superfamily
A, B	IPR001796	Dihydrofolate reductase domain	Domain

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.