Annotations: 1XIK

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1xikb_	All alpha proteins	Ferritin-like	Ferritin-like	Ribonucleotide reductase-like	Ribonucleotide reductase R2	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
A	d1xika_	All alpha proteins	Ferritin-like	Ferritin-like	Ribonucleotide reductase-like	Ribonucleotide reductase R2	(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)
B	SCOP2B Superfamily	Ferritin-like	8032952	3001658	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Ferritin-like	8032952	3001658	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)
B	Ribonuc_red_sm	e1xikB1	A: alpha bundles	X: Ferritin/Heme oxygenase/4-helical cytokines	H: Ferritin/Heme oxygenase	T: Heme oxygenase/Ribonucleotide reductase	F: Ribonuc_red_sm	ECOD (1.6)
A	Ribonuc_red_sm	e1xikA1	A: alpha bundles	X: Ferritin/Heme oxygenase/4-helical cytokines	H: Ferritin/Heme oxygenase	T: Heme oxygenase/Ribonucleotide reductase	F: Ribonuc_red_sm	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.620.20	Mainly Alpha	Orthogonal Bundle	Ribonucleotide Reductase, subunit A	Ribonucleotide Reductase, subunit A	CATH (4.3.0)
A	1.10.620.20	Mainly Alpha	Orthogonal Bundle	Ribonucleotide Reductase, subunit A	Ribonucleotide Reductase, subunit A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00268	Ribonucleotide reductase, small chain (Ribonuc_red_sm)	Ribonucleotide reductase, small chain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PROTEIN R2 OF RIBONUCLEOTIDE REDUCTASE	ribonucleoside-diphosphate reductase activity oxidoreductase activity oxidoreductase activity, acting on CH or CH2 groups oxidoreductase activity, acting on CH or CH2 groups, disulfide as acceptor ribonucleoside-diphosphate reductase activity, thioredoxin disulfide as acceptor catalytic activity cation binding transition metal ion binding iron ion binding ion binding binding metal ion binding small molecule binding identical protein binding ribonucleoside-diphosphate reductase activity oxidoreductase activity oxidoreductase activity, acting on CH or CH2 groups oxidoreductase activity, acting on CH or CH2 groups, disulfide as acceptor ribonucleoside-diphosphate reductase activity, thioredoxin disulfide as acceptor catalytic activity cation binding transition metal ion binding iron ion binding ion binding binding metal ion binding small molecule binding identical protein binding protein binding	nucleobase-containing compound metabolic process nucleobase-containing small molecule metabolic process small molecule metabolic process metabolic process primary metabolic process nucleobase-containing small molecule interconversion nucleoside phosphate metabolic process cellular metabolic process nucleoside diphosphate metabolic process organophosphate metabolic process ribonucleoside diphosphate metabolic process phosphate-containing compound metabolic process cellular process phosphorus metabolic process nucleobase-containing compound metabolic process nucleobase-containing small molecule metabolic process small molecule metabolic process metabolic process primary metabolic process nucleobase-containing small molecule interconversion nucleoside phosphate metabolic process cellular metabolic process nucleoside diphosphate metabolic process organophosphate metabolic process ribonucleoside diphosphate metabolic process phosphate-containing compound metabolic process cellular process phosphorus metabolic process deoxyribose phosphate biosynthetic process nucleotide biosynthetic process carbohydrate derivative metabolic process deoxyribonucleotide biosynthetic process deoxyribonucleotide metabolic process carbohydrate derivative biosynthetic process 2'-deoxyribonucleotide metabolic process 2'-deoxyribonucleotide biosynthetic process nucleotide metabolic process deoxyribose phosphate metabolic process nucleobase-containing compound biosynthetic process biosynthetic process organophosphate biosynthetic process nucleoside phosphate biosynthetic process	protein-containing complex intracellular anatomical structure catalytic complex oxidoreductase complex cytoplasm cellular anatomical entity cytosol ribonucleoside-diphosphate reductase complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR033909	Ribonucleotide reductase small subunit	Family
A, B	IPR012348	Ribonucleotide reductase-like	Homologous Superfamily
A, B	IPR009078	Ferritin-like superfamily	Homologous Superfamily
A, B	IPR000358	Ribonucleotide reductase small subunit family	Family
A, B	IPR030475	Ribonucleotide reductase small subunit, acitve site	Active Site

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.