Annotations: 4CI0

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	FrhB/FdhB-like	8045905	3002602	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)
C	FrhB_FdhB_C	e4ci0C1	A: alpha arrays	X: F420-reducing hydrogenase subunit beta (From Topology)	H: F420-reducing hydrogenase subunit beta (From Topology)	T: F420-reducing hydrogenase subunit beta	F: FrhB_FdhB_C	ECOD (1.6)
B	Fer4_21_1	e4ci0B1	A: a+b two layers	X: 4Fe-4S ferredoxin (From Topology)	H: 4Fe-4S ferredoxin (From Topology)	T: 4Fe-4S ferredoxin	F: Fer4_21_1	ECOD (1.6)
B	Oxidored_q6	e4ci0B2	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: CheY-like	F: Oxidored_q6	ECOD (1.6)
A	NiFeSe_Hases_1st	e4ci0A2	A: alpha complex topology	X: alpha-helical domain in nickel-iron hydrogenase, large subunit (From Topology)	H: alpha-helical domain in nickel-iron hydrogenase, large subunit (From Topology)	T: alpha-helical domain in nickel-iron hydrogenase, large subunit	F: NiFeSe_Hases_1st	ECOD (1.6)
A	NiFeSe_Hases_3rd_1	e4ci0A1	A: a+b two layers	X: FAD-linked reductases, C-terminal domain-like	H: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)	T: Ni-Fe binding domain in nickel-iron hydrogenase large subunit	F: NiFeSe_Hases_3rd_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C	3.10.450.750	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)
B	3.40.50.700	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NADH:ubiquinone oxidoreductase-like, 20kDa subunit	CATH (4.3.0)
B	3.30.70.20	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
A	1.10.645.10	Mainly Alpha	Orthogonal Bundle	Cytochrome-c3 Hydrogenase	chain B	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	F420-REDUCING HYDROGENASE, SUBUNIT BETA	oxidoreductase activity, acting on hydrogen as donor, with other known acceptors oxidoreductase activity coenzyme F420 hydrogenase activity oxidoreductase activity, acting on hydrogen as donor catalytic activity cation binding transition metal ion binding ion binding binding nickel cation binding metal ion binding small molecule binding iron-sulfur cluster binding 4 iron, 4 sulfur cluster binding oxidoreductase activity, acting on hydrogen as donor, with other known acceptors oxidoreductase activity coenzyme F420 hydrogenase activity oxidoreductase activity, acting on hydrogen as donor catalytic activity cation binding transition metal ion binding ion binding binding nickel cation binding metal ion binding small molecule binding iron-sulfur cluster binding 4 iron, 4 sulfur cluster binding metal cluster binding oxidoreductase activity, acting on CH or CH2 groups, with an iron-sulfur protein as acceptor oxidoreductase activity, acting on CH or CH2 groups flavin adenine dinucleotide binding nucleoside phosphate binding anion binding nucleotide binding heterocyclic compound binding	-	-
B	F420-REDUCING HYDROGENASE, SUBUNIT GAMMA	oxidoreductase activity, acting on hydrogen as donor, with other known acceptors oxidoreductase activity coenzyme F420 hydrogenase activity oxidoreductase activity, acting on hydrogen as donor catalytic activity cation binding transition metal ion binding ion binding binding nickel cation binding metal ion binding small molecule binding iron-sulfur cluster binding 4 iron, 4 sulfur cluster binding oxidoreductase activity, acting on hydrogen as donor, with other known acceptors oxidoreductase activity coenzyme F420 hydrogenase activity oxidoreductase activity, acting on hydrogen as donor catalytic activity cation binding transition metal ion binding ion binding binding nickel cation binding metal ion binding small molecule binding iron-sulfur cluster binding 4 iron, 4 sulfur cluster binding metal cluster binding flavin adenine dinucleotide binding nucleoside phosphate binding anion binding nucleotide binding heterocyclic compound binding	-	-
A	F420-REDUCING HYDROGENASE, SUBUNIT ALPHA	oxidoreductase activity, acting on hydrogen as donor, with other known acceptors oxidoreductase activity coenzyme F420 hydrogenase activity oxidoreductase activity, acting on hydrogen as donor catalytic activity iron-sulfur cluster binding binding metal cluster binding small molecule binding cation binding transition metal ion binding ion binding nickel cation binding metal ion binding oxidoreductase activity, acting on hydrogen as donor, with other known acceptors oxidoreductase activity coenzyme F420 hydrogenase activity oxidoreductase activity, acting on hydrogen as donor catalytic activity iron-sulfur cluster binding binding metal cluster binding small molecule binding cation binding transition metal ion binding ion binding nickel cation binding metal ion binding oxidoreductase activity, acting on hydrogen as donor, iron-sulfur protein as acceptor ferredoxin hydrogenase activity flavin adenine dinucleotide binding nucleoside phosphate binding anion binding nucleotide binding heterocyclic compound binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR045220	Oxidoreductase FRHB/FDHB/HCAR-like	Family
C	IPR007516	Coenzyme F420 hydrogenase/dehydrogenase beta subunit, N-terminal	Domain
C	IPR017679	Coenzyme F420 hydrogenase subunit beta, archaea	Family
C	IPR007525	Coenzyme F420 hydrogenase/dehydrogenase beta subunit, C-terminal	Domain
B	IPR017900	4Fe-4S ferredoxin, iron-sulphur binding, conserved site	Conserved Site
B	IPR017681	Coenzyme F420 hydrogenase, subunit gamma	Family
B	IPR017896	4Fe-4S ferredoxin-type, iron-sulphur binding domain	Domain
B	IPR051349	Hydrogenase complex-associated protein	Family
B	IPR037024	[NiFe]-hydrogenase, small subunit, N-terminal domain superfamily	Homologous Superfamily
B	IPR006137	NADH:ubiquinone oxidoreductase-like, 20kDa subunit	Domain
A	IPR017682	Coenzyme F420 hydrogenase, subunit alpha	Family
A	IPR001501	Nickel-dependent hydrogenase, large subunit	Family
A	IPR029014	[NiFe]-hydrogenase, large subunit	Homologous Superfamily
A	IPR018194	Nickel-dependent hydrogenase, large subunit, nickel binding site	Binding 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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.