2A9H

NMR structural studies of a potassium channel / charybdotoxin complex

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Protein Modification Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2a9ha1	Membrane and cell surface proteins and peptides	Gated ion channels	Voltage-gated ion channels	Voltage-gated potassium channels	Potassium channel protein	(Streptomyces lividans ) [TaxId: 1916 ],	SCOPe (2.08)
B	d2a9hb_	Membrane and cell surface proteins and peptides	Gated ion channels	Voltage-gated ion channels	Voltage-gated potassium channels	Potassium channel protein	(Streptomyces lividans ) [TaxId: 1916 ],	SCOPe (2.08)
C	d2a9hc_	Membrane and cell surface proteins and peptides	Gated ion channels	Voltage-gated ion channels	Voltage-gated potassium channels	Potassium channel protein	(Streptomyces lividans ) [TaxId: 1916 ],	SCOPe (2.08)
D	d2a9hd_	Membrane and cell surface proteins and peptides	Gated ion channels	Voltage-gated ion channels	Voltage-gated potassium channels	Potassium channel protein	(Streptomyces lividans ) [TaxId: 1916 ],	SCOPe (2.08)
E	d2a9he1	Small proteins	Knottins (small inhibitors, toxins, lectins)	Scorpion toxin-like	Short-chain scorpion toxins	Charybdotoxin	(Leiurus hebraeus ) [TaxId: 2899558 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Voltage-gated potassium channels	8003437	3000023	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Voltage-gated potassium channels	8003437	3000023	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Voltage-gated potassium channels	8003437	3000023	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Voltage-gated potassium channels	8003437	3000023	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Scorpion toxin-like	8038204	3000309	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	Ion_trans_2	e2a9hA1	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2	ECOD (1.6)
B	Ion_trans_2	e2a9hB1	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2	ECOD (1.6)
C	Ion_trans_2	e2a9hC1	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2	ECOD (1.6)
D	Ion_trans_2	e2a9hD1	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2	ECOD (1.6)
E	Toxin_2	e2a9hE1	A: few secondary structure elements	X: omega toxin-like	H: omega toxin-related	T: Scorpion toxin-like	F: Toxin_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
B	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
C	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
D	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF07885	Ion channel (Ion_trans_2)	Ion channel	-	Family
A, B, C, D	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family
E	PF00451	Scorpion short toxin, BmKK2 (Toxin_2)	Scorpion short toxin, BmKK2	Members of this family, which are found in various scorpion toxins, confer potassium channel blocking activity [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Voltage-gated potassium channel	monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion channel activity potassium ion transmembrane transporter activity voltage-gated channel activity voltage-gated monoatomic ion channel activity potassium channel activity voltage-gated monoatomic cation channel activity monoatomic cation channel activity passive transmembrane transporter activity voltage-gated potassium channel activity inorganic molecular entity transmembrane transporter activity channel activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion channel activity potassium ion transmembrane transporter activity voltage-gated channel activity voltage-gated monoatomic ion channel activity potassium channel activity voltage-gated monoatomic cation channel activity monoatomic cation channel activity passive transmembrane transporter activity voltage-gated potassium channel activity inorganic molecular entity transmembrane transporter activity channel activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity identical protein binding protein binding binding	biological regulation action potential regulation of biological quality regulation of membrane potential	voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex membrane plasma membrane potassium channel complex membrane protein complex cation channel complex transporter complex cell periphery cellular anatomical structure transmembrane transporter complex monoatomic ion channel complex
E	charybdotoxin	molecular function inhibitor activity channel regulator activity transporter inhibitor activity ion channel inhibitor activity ion channel regulator activity molecular function regulator activity transporter regulator activity channel inhibitor activity potassium channel regulator activity toxin activity	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response response to external stimulus response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus defense response to fungus response to fungus cellular process biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response response to external stimulus response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus defense response to fungus response to fungus cellular process disruption of cell in another organism disruption of anatomical structure in another organism killing of cells of another organism cell killing	cellular anatomical structure extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR013099	Potassium channel domain	Domain
A, B, C, D	IPR028325	Voltage-gated potassium channel	Family
E	IPR036574	Knottin, scorpion toxin-like superfamily	Homologous Superfamily
E	IPR001947	Scorpion short chain toxin, potassium channel inhibitor	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C, D, E	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	KcsA voltage-gated K+ channels

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B, C, D, E	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B, C, D, E	MemProtMD	Annotated as membrane protein by MemProtMD

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
E	PCA	Parent Component: GLN RESID: AA0031 PSI-MOD : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

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.