Annotations: 1QX4

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1qx4a1	All beta proteins	Reductase/isomerase/elongation factor common domain	Riboflavin synthase domain-like	Ferredoxin reductase FAD-binding domain-like	cytochrome b5 reductase	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)
A	d1qx4a2	Alpha and beta proteins (a/b)	Ferredoxin reductase-like, C-terminal NADP-linked domain	Ferredoxin reductase-like, C-terminal NADP-linked domain	Reductases	cytochrome b5 reductase	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)
A	d1qx4a3	Artifacts	Tags	Tags	Tags	N-terminal Tags	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)
B	d1qx4b1	All beta proteins	Reductase/isomerase/elongation factor common domain	Riboflavin synthase domain-like	Ferredoxin reductase FAD-binding domain-like	cytochrome b5 reductase	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)
B	d1qx4b2	Alpha and beta proteins (a/b)	Ferredoxin reductase-like, C-terminal NADP-linked domain	Ferredoxin reductase-like, C-terminal NADP-linked domain	Reductases	cytochrome b5 reductase	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)
B	d1qx4b3	Artifacts	Tags	Tags	Tags	N-terminal Tags	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Riboflavin synthase domain-like	8036548	3001812	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Ferredoxin reductase-like, C-terminal NADP-linked domain	8036549	3001461	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Riboflavin synthase domain-like	8036548	3001812	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Ferredoxin reductase-like, C-terminal NADP-linked domain	8036549	3001461	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	Peptidase_S46, Trypsin_2	e1qx4A1	A: alpha bundles	X: Cloacin translocation domain	H: LigT-related	T: LigT-related	F: Peptidase_S46, Trypsin_2	ECOD (develop294)
A	Alk_phosphatase	e1qx4A2	A: alpha bundles	X: HTH	H: HTH	T: winged helix domain	F: Alk_phosphatase	ECOD (develop294)
B	Peptidase_S46, Trypsin_2	e1qx4B1	A: alpha bundles	X: Cloacin translocation domain	H: LigT-related	T: LigT-related	F: Peptidase_S46, Trypsin_2	ECOD (develop294)
B	Alk_phosphatase	e1qx4B2	A: alpha bundles	X: HTH	H: HTH	T: winged helix domain	F: Alk_phosphatase	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.30.10	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
A	3.40.50.80	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Nucleotide-binding domain of ferredoxin-NADP reductase (FNR) module	CATH (4.3.0)
B	2.40.30.10	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
B	3.40.50.80	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Nucleotide-binding domain of ferredoxin-NADP reductase (FNR) module	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00175	Oxidoreductase NAD-binding domain (NAD_binding_1)	Oxidoreductase NAD-binding domain	Xanthine dehydrogenases, that also bind FAD/NAD, have essentially no similarity.	Domain
A, B	PF00970	Oxidoreductase FAD-binding domain (FAD_binding_6)	Oxidoreductase FAD-binding domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	NADH-cytochrome b5 reductase	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding nucleoside phosphate binding ion binding ADP binding purine nucleotide binding anion binding adenyl nucleotide binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding nucleoside phosphate binding ion binding ADP binding purine nucleotide binding anion binding adenyl nucleotide binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding FAD binding flavin adenine dinucleotide binding oxidoreductase activity cytochrome-b5 reductase activity, acting on NAD(P)H oxidoreductase activity, acting on NAD(P)H oxidoreductase activity, acting on NAD(P)H, heme protein as acceptor catalytic activity cytochrome-b5 reductase activity, acting on NADH NAD binding cation binding AMP binding	secondary alcohol biosynthetic process small molecule biosynthetic process cholesterol biosynthetic process sterol metabolic process steroid metabolic process cholesterol metabolic process lipid biosynthetic process alcohol metabolic process primary metabolic process secondary alcohol metabolic process biosynthetic process sterol biosynthetic process alcohol biosynthetic process small molecule metabolic process secondary alcohol biosynthetic process small molecule biosynthetic process cholesterol biosynthetic process sterol metabolic process steroid metabolic process cholesterol metabolic process lipid biosynthetic process alcohol metabolic process primary metabolic process secondary alcohol metabolic process biosynthetic process sterol biosynthetic process alcohol biosynthetic process small molecule metabolic process metabolic process cellular process steroid biosynthetic process lipid metabolic process nitric oxide metabolic process nitric oxide biosynthetic process reactive nitrogen species metabolic process	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle protein-containing complex catalytic complex nitric-oxide synthase complex oxidoreductase complex lipid droplet membraneless organelle membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle protein-containing complex catalytic complex nitric-oxide synthase complex oxidoreductase complex lipid droplet membraneless organelle intracellular membraneless organelle mitochondrial membrane membrane organelle envelope mitochondrial envelope organelle membrane cytosol organelle outer membrane bounding membrane of organelle mitochondrial outer membrane outer membrane endoplasmic reticulum endomembrane system organelle subcompartment endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR001709	Flavoprotein pyridine nucleotide cytochrome reductase	Domain
A, B	IPR001433	Oxidoreductase FAD/NAD(P)-binding	Domain
A, B	IPR001834	NADH:cytochrome b5 reductase-like	Family
A, B	IPR039261	Ferredoxin-NADP reductase (FNR), nucleotide-binding domain	Homologous Superfamily
A, B	IPR008333	Flavoprotein pyridine nucleotide cytochrome reductase-like, FAD-binding domain	Domain
A, B	IPR017938	Riboflavin synthase-like beta-barrel	Homologous Superfamily
A, B	IPR017927	FAD-binding domain, ferredoxin reductase-type	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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.