Annotations: 3UBR

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d3ubra_	All alpha proteins	Multiheme cytochromes	Multiheme cytochromes	Di-heme elbow motif	automated matches	(Shewanella oneidensis ) [TaxId: 70863 ],	SCOPe (2.08)
B	d3ubrb_	All alpha proteins	Multiheme cytochromes	Multiheme cytochromes	Di-heme elbow motif	automated matches	(Shewanella oneidensis ) [TaxId: 70863 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Cytochrom_C552	e3ubrA1	A: few secondary structure elements	X: Multiheme cytochromes	H: Di-heme elbow motif (From Topology)	T: Di-heme elbow motif	F: Cytochrom_C552	ECOD (1.6)
B	Cytochrom_C552	e3ubrB1	A: few secondary structure elements	X: Multiheme cytochromes	H: Di-heme elbow motif (From Topology)	T: Di-heme elbow motif	F: Cytochrom_C552	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.1130.10	Mainly Alpha	Orthogonal Bundle	Flavocytochrome C3	Chain A, domain 2	CATH (4.3.0)
A	1.20.140.10	Mainly Alpha	Up-down Bundle	Butyryl-CoA Dehydrogenase, subunit A	domain 3	CATH (4.3.0)
B	1.10.1130.10	Mainly Alpha	Orthogonal Bundle	Flavocytochrome C3	Chain A, domain 2	CATH (4.3.0)
B	1.20.140.10	Mainly Alpha	Up-down Bundle	Butyryl-CoA Dehydrogenase, subunit A	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF02335	Cytochrome c552 (Cytochrom_C552)	Cytochrome c552	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Cytochrome c-552	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding oxidoreductase activity, acting on other nitrogenous compounds as donors, cytochrome as acceptor oxidoreductase activity nitrite reductase (cytochrome, ammonia-forming) activity oxidoreductase activity, acting on other nitrogenous compounds as donors nitrite reductase activity catalytic activity organic cyclic compound binding tetrapyrrole binding cation binding ion binding binding calcium ion binding metal ion binding small molecule binding oxidoreductase activity, acting on other nitrogenous compounds as donors, cytochrome as acceptor oxidoreductase activity nitrite reductase (cytochrome, ammonia-forming) activity oxidoreductase activity, acting on other nitrogenous compounds as donors nitrite reductase activity catalytic activity organic cyclic compound binding tetrapyrrole binding heme binding transition metal ion binding iron ion binding	nitrate assimilation oxoacid metabolic process cellular metabolic process organic acid metabolic process reactive nitrogen species metabolic process nitrogen cycle metabolic process organic substance metabolic process metabolic process small molecule metabolic process cellular process nitrate metabolic process anaerobic electron transport chain cellular respiration energy derivation by oxidation of organic compounds nitrate assimilation oxoacid metabolic process cellular metabolic process organic acid metabolic process reactive nitrogen species metabolic process nitrogen cycle metabolic process organic substance metabolic process metabolic process small molecule metabolic process cellular process nitrate metabolic process anaerobic electron transport chain cellular respiration energy derivation by oxidation of organic compounds respiratory electron transport chain electron transport chain generation of precursor metabolites and energy anaerobic respiration	outer membrane-bounded periplasmic space cell envelope periplasmic space cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR017570	Formate-dependent cytochrome c nitrite reductase, c552 subunit	Family
A, B	IPR036280	Multiheme cytochrome superfamily	Homologous Superfamily
A, B	IPR003321	Cytochrome c552	Family

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.