Annotations: 4N4N

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d4n4na_	All alpha proteins	Multiheme cytochromes	Multiheme cytochromes	Di-heme elbow motif	automated matches	(Nitrosomonas europaea ) [TaxId: 915 ],	SCOPe (2.08)
E	d4n4ne_	All alpha proteins	Multiheme cytochromes	Multiheme cytochromes	Di-heme elbow motif	automated matches	(Nitrosomonas europaea ) [TaxId: 915 ],	SCOPe (2.08)
C	d4n4nc_	All alpha proteins	Multiheme cytochromes	Multiheme cytochromes	Di-heme elbow motif	automated matches	(Nitrosomonas europaea ) [TaxId: 915 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Di-heme elbow motif	8003665	3000145	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	HAO C-terminal domain-like	8056472	3002349	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Di-heme elbow motif	8003667	3000145	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Di-heme elbow motif	8003666	3000145	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Di-heme elbow motif	8003667	3000145	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	HAO C-terminal domain-like	8056472	3002349	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Di-heme elbow motif	8003665	3000145	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Di-heme elbow motif	8003666	3000145	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Di-heme elbow motif	8003667	3000145	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Di-heme elbow motif	8003665	3000145	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Di-heme elbow motif	8003666	3000145	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	HAO C-terminal domain-like	8056472	3002349	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	Multi-haem_cyto	e4n4nA1	A: few secondary structure elements	X: Multiheme cytochromes	H: Di-heme elbow motif (From Topology)	T: Di-heme elbow motif	F: Multi-haem_cyto	ECOD (1.6)
E	Multi-haem_cyto	e4n4nE1	A: few secondary structure elements	X: Multiheme cytochromes	H: Di-heme elbow motif (From Topology)	T: Di-heme elbow motif	F: Multi-haem_cyto	ECOD (1.6)
C	Multi-haem_cyto	e4n4nC1	A: few secondary structure elements	X: Multiheme cytochromes	H: Di-heme elbow motif (From Topology)	T: Di-heme elbow motif	F: Multi-haem_cyto	ECOD (1.6)
D	EUF08751	e4n4nD1	A: few secondary structure elements	X: hypothetical protein NE1300 (From Topology)	H: hypothetical protein NE1300 (From Topology)	T: hypothetical protein NE1300	F: EUF08751	ECOD (1.6)
F	EUF08751	e4n4nF1	A: few secondary structure elements	X: hypothetical protein NE1300 (From Topology)	H: hypothetical protein NE1300 (From Topology)	T: hypothetical protein NE1300	F: EUF08751	ECOD (1.6)
B	EUF08751	e4n4nB1	A: few secondary structure elements	X: hypothetical protein NE1300 (From Topology)	H: hypothetical protein NE1300 (From Topology)	T: hypothetical protein NE1300	F: EUF08751	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.780.10	Mainly Alpha	Orthogonal Bundle	Hydroxylamine Oxidoreductase	Chain A, domain 1	CATH (4.3.0)
A	1.20.850.10	Mainly Alpha	Up-down Bundle	Hydroxylamine Oxidoreductase	Chain A, domain 2	CATH (4.3.0)
E	1.10.780.10	Mainly Alpha	Orthogonal Bundle	Hydroxylamine Oxidoreductase	Chain A, domain 1	CATH (4.3.0)
E	1.20.850.10	Mainly Alpha	Up-down Bundle	Hydroxylamine Oxidoreductase	Chain A, domain 2	CATH (4.3.0)
C	1.10.780.10	Mainly Alpha	Orthogonal Bundle	Hydroxylamine Oxidoreductase	Chain A, domain 1	CATH (4.3.0)
C	1.20.850.10	Mainly Alpha	Up-down Bundle	Hydroxylamine Oxidoreductase	Chain A, domain 2	CATH (4.3.0)
D	3.90.640.100	Alpha Beta	Alpha-Beta Complex	Actin	Chain A, domain 4	CATH (4.3.0)
F	3.90.640.100	Alpha Beta	Alpha-Beta Complex	Actin	Chain A, domain 4	CATH (4.3.0)
B	3.90.640.100	Alpha Beta	Alpha-Beta Complex	Actin	Chain A, domain 4	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C, E	PF13447	Seven times multi-haem cytochrome CxxCH (Multi-haem_cyto)	Seven times multi-haem cytochrome CxxCH	This domain carries up to seven CxxCH repeated sequence motifs, characteristic of multi-haem cytochromes.	Domain
B, D, F	PF20836	Hypothetical protein NE1300 (HAO_bd)	Hypothetical protein NE1300	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C, E	Hydroxylamine oxidoreductase	oxidoreductase activity catalytic 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 hydroxylamine oxidoreductase activity oxidoreductase activity, acting on other nitrogenous compounds as donors oxidoreductase activity, acting on other nitrogenous compounds as donors, oxygen as acceptor hydroxylamine oxidase activity binding organic cyclic compound binding tetrapyrrole binding heme binding cation binding ion binding oxidoreductase activity catalytic 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 hydroxylamine oxidoreductase activity oxidoreductase activity, acting on other nitrogenous compounds as donors oxidoreductase activity, acting on other nitrogenous compounds as donors, oxygen as acceptor hydroxylamine oxidase activity binding organic cyclic compound binding tetrapyrrole binding heme binding cation binding ion binding metal ion binding small molecule binding identical protein binding protein binding	ammonia oxidation cellular respiration energy derivation by oxidation of organic compounds energy derivation by oxidation of reduced inorganic compounds small molecule metabolic process metabolic process cellular process generation of precursor metabolites and energy anaerobic respiration, using ammonium as electron donor anaerobic respiration protein-containing complex organization protein trimerization cellular component organization cellular component biogenesis ammonia oxidation cellular respiration energy derivation by oxidation of organic compounds energy derivation by oxidation of reduced inorganic compounds small molecule metabolic process metabolic process cellular process generation of precursor metabolites and energy anaerobic respiration, using ammonium as electron donor anaerobic respiration protein-containing complex organization protein trimerization cellular component organization cellular component biogenesis cellular component assembly protein homotrimerization protein complex oligomerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure anammoxosome organelle cytoplasm intracellular membrane-bounded organelle
B, D, F	hydroxylamine oxidoreductase	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C, E	IPR036280	Multiheme cytochrome superfamily	Homologous Superfamily
A, C, E	IPR012138	Hydroxylamine oxidase	Family
B, D, F	IPR048785	NE1300-like superfamily	Homologous Superfamily
B, D, F	IPR048778	NE1300-like	Family

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.