Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
A [auth S]Oxidored_q6e4gd3S2 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: CheY-likeF: Oxidored_q6ECOD (1.6)
A [auth S]NiFe_hyd_SSU_Ce4gd3S3 A: few secondary structure elementsX: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunitF: NiFe_hyd_SSU_CECOD (1.6)
A [auth S]hydA_likee4gd3S1 A: extended segmentsX: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)H: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)T: Transmembrane helix of nickel-iron hydrogenase small subunitF: hydA_likeECOD (1.6)
C [auth T]Oxidored_q6e4gd3T2 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: CheY-likeF: Oxidored_q6ECOD (1.6)
C [auth T]NiFe_hyd_SSU_Ce4gd3T1 A: few secondary structure elementsX: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunitF: NiFe_hyd_SSU_CECOD (1.6)
C [auth T]hydA_likee4gd3T3 A: extended segmentsX: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)H: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)T: Transmembrane helix of nickel-iron hydrogenase small subunitF: hydA_likeECOD (1.6)
E [auth Q]Oxidored_q6e4gd3Q2 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: CheY-likeF: Oxidored_q6ECOD (1.6)
E [auth Q]NiFe_hyd_SSU_Ce4gd3Q1 A: few secondary structure elementsX: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunitF: NiFe_hyd_SSU_CECOD (1.6)
E [auth Q]hydA_likee4gd3Q3 A: extended segmentsX: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)H: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)T: Transmembrane helix of nickel-iron hydrogenase small subunitF: hydA_likeECOD (1.6)
G [auth R]Oxidored_q6e4gd3R2 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: CheY-likeF: Oxidored_q6ECOD (1.6)
G [auth R]NiFe_hyd_SSU_Ce4gd3R1 A: few secondary structure elementsX: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit (From Topology)T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunitF: NiFe_hyd_SSU_CECOD (1.6)
G [auth R]hydA_likee4gd3R3 A: extended segmentsX: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)H: Transmembrane helix of nickel-iron hydrogenase small subunit (From Topology)T: Transmembrane helix of nickel-iron hydrogenase small subunitF: hydA_likeECOD (1.6)
B [auth L]NiFeSe_Hases_2nde4gd3L1 A: beta meandersX: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)H: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)T: all-beta domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_2ndECOD (1.6)
B [auth L]NiFeSe_Hases_1ste4gd3L4 A: alpha complex topologyX: 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 subunitF: NiFeSe_Hases_1stECOD (1.6)
B [auth L]NiFeSe_Hases_3rde4gd3L3 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rdECOD (1.6)
B [auth L]NiFeSe_Hases_3rd_1e4gd3L2 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rd_1ECOD (1.6)
D [auth M]NiFeSe_Hases_2nde4gd3M1 A: beta meandersX: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)H: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)T: all-beta domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_2ndECOD (1.6)
D [auth M]NiFeSe_Hases_1ste4gd3M3 A: alpha complex topologyX: 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 subunitF: NiFeSe_Hases_1stECOD (1.6)
D [auth M]NiFeSe_Hases_3rde4gd3M2 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rdECOD (1.6)
D [auth M]NiFeSe_Hases_3rd_1e4gd3M4 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rd_1ECOD (1.6)
F [auth J]NiFeSe_Hases_2nde4gd3J4 A: beta meandersX: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)H: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)T: all-beta domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_2ndECOD (1.6)
F [auth J]NiFeSe_Hases_1ste4gd3J2 A: alpha complex topologyX: 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 subunitF: NiFeSe_Hases_1stECOD (1.6)
F [auth J]NiFeSe_Hases_3rde4gd3J3 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rdECOD (1.6)
F [auth J]NiFeSe_Hases_3rd_1e4gd3J1 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rd_1ECOD (1.6)
H [auth K]NiFeSe_Hases_2nde4gd3K1 A: beta meandersX: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)H: all-beta domain in nickel-iron hydrogenase large subunit (From Topology)T: all-beta domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_2ndECOD (1.6)
H [auth K]NiFeSe_Hases_1ste4gd3K3 A: alpha complex topologyX: 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 subunitF: NiFeSe_Hases_1stECOD (1.6)
H [auth K]NiFeSe_Hases_3rde4gd3K2 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rdECOD (1.6)
H [auth K]NiFeSe_Hases_3rd_1e4gd3K4 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: Ni-Fe binding domain in nickel-iron hydrogenase large subunit (From Topology)T: Ni-Fe binding domain in nickel-iron hydrogenase large subunitF: NiFeSe_Hases_3rd_1ECOD (1.6)
I [auth A]Ni_hydr_CYTBe4gd3A1 A: alpha bundlesX: Transmembrane heme-binding four-helical bundle (From Homology)H: Transmembrane heme-binding four-helical bundleT: Transmembrane di-heme cytochromesF: Ni_hydr_CYTBECOD (1.6)
J [auth B]Ni_hydr_CYTBe4gd3B2 A: alpha bundlesX: Transmembrane heme-binding four-helical bundle (From Homology)H: Transmembrane heme-binding four-helical bundleT: Transmembrane di-heme cytochromesF: Ni_hydr_CYTBECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A [auth S]3.40.50.700 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold NADH:ubiquinone oxidoreductase-like, 20kDa subunitCATH (4.3.0)
A [auth S]4.10.480.10 Few Secondary Structures Irregular Cytochrome-c3 Hydrogenase Chain A, domain 2CATH (4.3.0)
C [auth T]3.40.50.700 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold NADH:ubiquinone oxidoreductase-like, 20kDa subunitCATH (4.3.0)
C [auth T]4.10.480.10 Few Secondary Structures Irregular Cytochrome-c3 Hydrogenase Chain A, domain 2CATH (4.3.0)
E [auth Q]3.40.50.700 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold NADH:ubiquinone oxidoreductase-like, 20kDa subunitCATH (4.3.0)
E [auth Q]4.10.480.10 Few Secondary Structures Irregular Cytochrome-c3 Hydrogenase Chain A, domain 2CATH (4.3.0)
G [auth R]3.40.50.700 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold NADH:ubiquinone oxidoreductase-like, 20kDa subunitCATH (4.3.0)
G [auth R]4.10.480.10 Few Secondary Structures Irregular Cytochrome-c3 Hydrogenase Chain A, domain 2CATH (4.3.0)
B [auth L]1.10.645.10 Mainly Alpha Orthogonal Bundle Cytochrome-c3 Hydrogenase chain BCATH (4.3.0)
D [auth M]1.10.645.10 Mainly Alpha Orthogonal Bundle Cytochrome-c3 Hydrogenase chain BCATH (4.3.0)
F [auth J]1.10.645.10 Mainly Alpha Orthogonal Bundle Cytochrome-c3 Hydrogenase chain BCATH (4.3.0)
H [auth K]1.10.645.10 Mainly Alpha Orthogonal Bundle Cytochrome-c3 Hydrogenase chain BCATH (4.3.0)
I [auth A]1.20.950.20 Mainly Alpha Up-down Bundle Fumarate Reductase Cytochrome B subunit Transmembrane di-heme cytochromes, Chain CCATH (4.3.0)
J [auth B]1.20.950.20 Mainly Alpha Up-down Bundle Fumarate Reductase Cytochrome B subunit Transmembrane di-heme cytochromes, Chain CCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
Hydrogenase-1 small chain
B [auth L],
D [auth M],
F [auth J],
H [auth K]
Hydrogenase-1 large chain
I [auth A],
J [auth B]
Ni/Fe-hydrogenase 1 B-type cytochrome subunit

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR006311Twin-arginine translocation pathway, signal sequenceConserved Site
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR001821[NiFe]-hydrogenase, small subunitFamily
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR027394Cytochrome-c3 hydrogenase, C-terminalDomain
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR006137NADH:ubiquinone oxidoreductase-like, 20kDa subunitDomain
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR037024[NiFe]-hydrogenase, small subunit, N-terminal domain superfamilyHomologous Superfamily
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR019546Twin-arginine translocation pathway, signal sequence, bacterial/archaealConserved Site
A [auth S],
C [auth T],
E [auth Q],
G [auth R]
IPR037148[NiFe]-hydrogenase, small subunit, C-terminal domain superfamilyHomologous Superfamily
B [auth L],
D [auth M],
F [auth J],
H [auth K]
IPR001501Nickel-dependent hydrogenase, large subunitFamily
B [auth L],
D [auth M],
F [auth J],
H [auth K]
IPR029014[NiFe]-hydrogenase, large subunitHomologous Superfamily
B [auth L],
D [auth M],
F [auth J],
H [auth K]
IPR050867[NiFe]/[NiFeSe] hydrogenase large subunitFamily
B [auth L],
D [auth M],
F [auth J],
H [auth K]
IPR018194Nickel-dependent hydrogenase, large subunit, nickel binding siteBinding Site
I [auth A],
J [auth B]
IPR051542Hydrogenase-associated cytochromeFamily
I [auth A],
J [auth B]
IPR011577Cytochrome b561, bacterial/Ni-hydrogenaseDomain
I [auth A],
J [auth B]
IPR016174Di-haem cytochrome, transmembraneHomologous Superfamily
I [auth A],
J [auth B]
IPR000516Nickel-dependent hydrogenase b-type cytochrome subunitFamily