3LX4

Stepwise [FeFe]-hydrogenase H-cluster assembly revealed in the structure of HydA(deltaEFG)

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Fe-only hydrogenase	8100494	3001826	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Fe-only hydrogenase smaller subunit	8101046	3001779	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Fe-only hydrogenase smaller subunit	8101046	3001779	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Fe-only hydrogenase	8100494	3001826	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	Fe_hyd_lg_C	e3lx4A6	A: a/b three-layered sandwiches	X: Fe-only hydrogenase (From Topology)	H: Fe-only hydrogenase (From Topology)	T: Fe-only hydrogenase	F: Fe_hyd_lg_C	ECOD (1.6)
A	Fe_hyd_SSU	e3lx4A5	A: extended segments	X: Fe-only hydrogenase smaller subunit (From Topology)	H: Fe-only hydrogenase smaller subunit (From Topology)	T: Fe-only hydrogenase smaller subunit	F: Fe_hyd_SSU	ECOD (1.6)
B	Fe_hyd_lg_C	e3lx4B4	A: a/b three-layered sandwiches	X: Fe-only hydrogenase (From Topology)	H: Fe-only hydrogenase (From Topology)	T: Fe-only hydrogenase	F: Fe_hyd_lg_C	ECOD (1.6)
B	Fe_hyd_SSU	e3lx4B3	A: extended segments	X: Fe-only hydrogenase smaller subunit (From Topology)	H: Fe-only hydrogenase smaller subunit (From Topology)	T: Fe-only hydrogenase smaller subunit	F: Fe_hyd_SSU	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.1780	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (4.3.0)
A	3.40.950.10	Alpha Beta	3-Layer(aba) Sandwich	Fe-only Hydrogenase (Larger Subunit)	Chain L, domain 3	CATH (4.3.0)
B	3.40.50.1780	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (4.3.0)
B	3.40.950.10	Alpha Beta	3-Layer(aba) Sandwich	Fe-only Hydrogenase (Larger Subunit)	Chain L, domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF02906	Iron only hydrogenase large subunit, C-terminal domain (Fe_hyd_lg_C)	Iron only hydrogenase large subunit, C-terminal domain	-	Domain
A, B	PF02256	Iron hydrogenase small subunit (Fe_hyd_SSU)	Iron hydrogenase small subunit	This family represents the small subunit of the Fe-only hydrogenases EC:1.18.99.1. The subunit is comprised of alternating random coil and alpha helical structures that encompasses the large subunit in a novel protein fold [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Fe-hydrogenase	oxidoreductase activity catalytic activity iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding cation binding ion binding metal ion binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR004108	Iron hydrogenase, large subunit, C-terminal	Domain
A, B	IPR050340	Cytosolic Fe-S Cluster Assembly Factor	Family
A, B	IPR009016	Iron hydrogenase	Homologous Superfamily
A, B	IPR003149	Iron hydrogenase, small subunit	Domain

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.