Annotations: 3OPO

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	HlyD beta-barrel domain-like	8092211	3002000	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	HlyD beta-barrel domain-like	8092211	3002000	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Single hybrid motif	8092212	3001880	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Single hybrid motif	8092212	3001880	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	HlyD C-terminal domain-like	8092213	3002572	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	HlyD C-terminal domain-like	8092213	3002572	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	HlyD beta-barrel domain-like	8092211	3002000	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	HlyD beta-barrel domain-like	8092211	3002000	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Single hybrid motif	8092212	3001880	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Single hybrid motif	8092212	3001880	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	PRK15030_2nd	e3opoA6	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
A	HlyD_D23_C	e3opoA5	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C	ECOD (1.6)
A	HlyD_D4	e3opoA8	A: alpha bundles	X: Helical bundle domain in CusB (From Topology)	H: Helical bundle domain in CusB (From Topology)	T: Helical bundle domain in CusB	F: HlyD_D4	ECOD (1.6)
A	HlyD_D23_N	e3opoA7	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_D23_N	ECOD (1.6)
B	PRK15030_2nd	e3opoB2	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
B	HlyD_D23_C	e3opoB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C	ECOD (1.6)
B	HlyD_D4	e3opoB4	A: alpha bundles	X: Helical bundle domain in CusB (From Topology)	H: Helical bundle domain in CusB (From Topology)	T: Helical bundle domain in CusB	F: HlyD_D4	ECOD (1.6)
B	HlyD_D23_N	e3opoB3	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_D23_N	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.420.20	Mainly Beta	Beta Barrel	conserved putative lor/sdh protein from methanococcus maripaludis s2 fold		CATH (4.3.0)
A	2.40.30.170	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
A	2.40.50.100	Mainly Beta	Beta Barrel	OB fold (Dihydrolipoamide Acetyltransferase, E2P)	RNA polymerase II/Efflux pump adaptor protein, barrel-sandwich hybrid domain	CATH (4.3.0)
A	6.10.140.730	Special	Helix non-globular	Helix Hairpins		CATH (4.3.0)
B	2.40.420.20	Mainly Beta	Beta Barrel	conserved putative lor/sdh protein from methanococcus maripaludis s2 fold		CATH (4.3.0)
B	2.40.30.170	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
B	2.40.50.100	Mainly Beta	Beta Barrel	OB fold (Dihydrolipoamide Acetyltransferase, E2P)	RNA polymerase II/Efflux pump adaptor protein, barrel-sandwich hybrid domain	CATH (4.3.0)
B	6.10.140.730	Special	Helix non-globular	Helix Hairpins		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF16572	Long alpha hairpin domain of cation efflux system protein, CusB (HlyD_D4)	Long alpha hairpin domain of cation efflux system protein, CusB	HlyD_D4 is the long alpha-hairpin domain in the centre of CusB or HlyD proteins. CusB and HlyD proteins are membrane fusion proteins of the CusCFBA copper efflux system in E.coli and related bacteria. Efflux systems of this resistance-nodulation-divi ...	HlyD_D4 is the long alpha-hairpin domain in the centre of CusB or HlyD proteins. CusB and HlyD proteins are membrane fusion proteins of the CusCFBA copper efflux system in E.coli and related bacteria. Efflux systems of this resistance-nodulation-division group - RND - have been developed to excrete poisonous metal ions, and in E.coli the only one that deals with silver and copper is the CusA transporter. The transporter CusA works in conjunction with a periplasmic component that is a membrane fusion protein, eg CusB, and an outer-membrane channel component CusC in a CusABC complex driven by import of protons. HlyD_D4 is thought to interact with the alpha-helical tunnels of the corresponding outer-membrane channels, ie the periplasmic domain of CusC [1].	Domain
A, B	PF00529	Cation efflux system protein CusB domain 1 (CusB_dom_1)	Cation efflux system protein CusB domain 1	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Cation efflux system protein cusB	monoatomic cation transmembrane transporter activity inorganic molecular entity transmembrane transporter activity copper ion transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity transition metal ion transmembrane transporter activity metal ion transmembrane transporter activity transmembrane transporter activity cation binding transition metal ion binding ion binding binding metal ion binding monoatomic cation transmembrane transporter activity inorganic molecular entity transmembrane transporter activity copper ion transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity transition metal ion transmembrane transporter activity metal ion transmembrane transporter activity transmembrane transporter activity cation binding transition metal ion binding ion binding binding metal ion binding small molecule binding copper ion binding	response to stimulus response to metal ion response to chemical response to silver ion response to inorganic substance response to copper ion transport monoatomic ion transmembrane transport inorganic ion transmembrane transport silver ion transport establishment of localization metal ion transport inorganic cation transmembrane transport transmembrane transport response to stimulus response to metal ion response to chemical response to silver ion response to inorganic substance response to copper ion transport monoatomic ion transmembrane transport inorganic ion transmembrane transport silver ion transport establishment of localization metal ion transport inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization silver ion transmembrane transport transition metal ion transport monoatomic ion transport cellular process monoatomic cation transport detoxification of inorganic compound detoxification of copper ion detoxification stress response to copper ion response to toxic substance response to stress stress response to metal ion inorganic ion homeostasis homeostatic process intracellular copper ion homeostasis copper ion homeostasis cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis copper ion transmembrane transport copper ion transport copper ion export plasma membrane copper ion transport	membrane cellular anatomical entity outer membrane-bounded periplasmic space cell envelope periplasmic space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR045800	Heavy metal binding domain	Domain
A, B	IPR006143	RND efflux pump, membrane fusion protein	Family
A, B	IPR032317	RND efflux pump, membrane fusion protein, barrel-sandwich domain	Domain
A, B	IPR043602	Cation efflux system protein CusB, domain 1	Domain

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Multi-Drug Efflux Transporters	CusB membrane fusion protein (apo protein)

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.