Annotations: 3B0G

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d3b0ga1	Alpha and beta proteins (a+b)	Ferredoxin-like	Nitrite/Sulfite reductase N-terminal domain-like	automated matches	automated matches	tobacco (Nicotiana tabacum ) [TaxId: 4097 ],	SCOPe (2.08)
A	d3b0ga2	Alpha and beta proteins (a+b)	Nitrite and sulphite reductase 4Fe-4S domain-like	Nitrite and sulphite reductase 4Fe-4S domain-like	automated matches	automated matches	tobacco (Nicotiana tabacum ) [TaxId: 4097 ],	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	NIR_SIR_ferr	e3b0gA4	A: a+b two layers	X: Alpha-beta plaits	H: Sulfite reductase, domains 1 and 3 (From Topology)	T: Sulfite reductase, domains 1 and 3	F: NIR_SIR_ferr	ECOD (1.6)
A	NIR_SIR	e3b0gA3	A: a+b three layers	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 (From Topology)	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 (From Topology)	T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	F: NIR_SIR	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.480.20	Alpha Beta	Alpha-Beta Complex	Sulfite Reductase Hemoprotein	domain 2	CATH (4.3.0)
A	3.30.413.10	Alpha Beta	2-Layer Sandwich	Sulfite Reductase Hemoprotein	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF03460	Nitrite/Sulfite reductase ferredoxin-like half domain (NIR_SIR_ferr)	Nitrite/Sulfite reductase ferredoxin-like half domain	-	Repeat
A	PF01077	Nitrite and sulphite reductase 4Fe-4S domain (NIR_SIR)	Nitrite and sulphite reductase 4Fe-4S domain	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Nitrite reductase	iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding oxidoreductase activity, acting on other nitrogenous compounds as donors, iron-sulfur protein as acceptor oxidoreductase activity ferredoxin-nitrite reductase activity oxidoreductase activity, acting on other nitrogenous compounds as donors nitrite reductase activity catalytic activity organic cyclic compound binding tetrapyrrole binding heme binding iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding oxidoreductase activity, acting on other nitrogenous compounds as donors, iron-sulfur protein as acceptor oxidoreductase activity ferredoxin-nitrite reductase activity oxidoreductase activity, acting on other nitrogenous compounds as donors nitrite reductase activity catalytic activity organic cyclic compound binding tetrapyrrole binding heme binding cation binding ion binding metal ion binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR006067	Nitrite/sulphite reductase 4Fe-4S domain	Domain
A	IPR005117	Nitrite/Sulfite reductase ferredoxin-like domain	Domain
A	IPR006066	Nitrite/sulphite reductase iron-sulphur/sirohaem-binding site	Binding Site
A	IPR045854	Nitrite and sulphite reductase 4Fe-4S domain-like superfamily	Homologous Superfamily
A	IPR036136	Nitrite/Sulfite reductase ferredoxin-like domain superfamily	Homologous Superfamily

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.