Annotations: 7W3Y

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	POZ domain	8041222	3000894	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	POZ domain	8041222	3000894	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	POZ domain	8041222	3000894	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	POZ domain	8041222	3000894	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	e7w3yA1	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	ECOD (1.6)
A	BTB_2	e7w3yA2	A: a+b two layers	X: POZ domain (From Topology)	H: POZ domain (From Topology)	T: POZ domain	F: BTB_2	ECOD (1.6)
B	Ion_trans	e7w3yB2	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	ECOD (1.6)
B	BTB_2	e7w3yB1	A: a+b two layers	X: POZ domain (From Topology)	H: POZ domain (From Topology)	T: POZ domain	F: BTB_2	ECOD (1.6)
C	Ion_trans	e7w3yC2	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	ECOD (1.6)
C	BTB_2	e7w3yC3	A: a+b two layers	X: POZ domain (From Topology)	H: POZ domain (From Topology)	T: POZ domain	F: BTB_2	ECOD (1.6)
D	Ion_trans	e7w3yD1	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	ECOD (1.6)
D	BTB_2	e7w3yD2	A: a+b two layers	X: POZ domain (From Topology)	H: POZ domain (From Topology)	T: POZ domain	F: BTB_2	ECOD (1.6)

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	PF02214	BTB/POZ domain (BTB_2)	BTB/POZ domain	In voltage-gated K+ channels this domain is responsible for subfamily-specific assembly of alpha-subunits into functional tetrameric channels [1]. In KCTD1 (Swiss:Q719H9) this domain functions as a transcriptional repressor [2]. It also mediates homo ...	In voltage-gated K+ channels this domain is responsible for subfamily-specific assembly of alpha-subunits into functional tetrameric channels [1]. In KCTD1 (Swiss:Q719H9) this domain functions as a transcriptional repressor [2]. It also mediates homomultimerisation of KCTD1 and interaction of KCTD1 with the transcription factor AP-2-alpha [2-3].	Domain
A, B, C, D	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Isoform 2 of Potassium voltage-gated channel subfamily D member 3	monoatomic cation transmembrane transporter activity A-type (transient outward) potassium channel activity gated channel activity monoatomic ion channel activity potassium ion transmembrane transporter activity outward rectifier potassium channel 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 monoatomic cation transmembrane transporter activity A-type (transient outward) potassium channel activity gated channel activity monoatomic ion channel activity potassium ion transmembrane transporter activity outward rectifier potassium channel 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 protein binding binding transmembrane transporter binding cation binding ion binding metal ion binding small molecule binding	heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process heart contraction blood circulation transport monoatomic ion transmembrane transport heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process heart contraction blood circulation transport monoatomic ion transmembrane transport potassium ion transmembrane transport inorganic ion transmembrane transport establishment of localization metal ion transport inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization monoatomic ion transport potassium ion transport cellular process monoatomic cation transport cardiac muscle cell membrane repolarization membrane repolarization ventricular cardiac muscle cell membrane repolarization regulation of biological quality regulation of membrane potential cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein complex oligomerization protein tetramerization protein-containing complex assembly cellular component organization or biogenesis action potential export from cell export across plasma membrane potassium ion export across plasma membrane cardiac muscle cell action potential involved in contraction membrane repolarization during cardiac muscle cell action potential cardiac muscle contraction striated muscle contraction actin filament-based process cardiac muscle cell contraction ventricular cardiac muscle cell action potential actin filament-based movement muscle contraction muscle system process membrane repolarization during action potential membrane repolarization during ventricular cardiac muscle cell action potential cardiac muscle cell action potential actin-mediated cell contraction trans-synaptic signaling synaptic signaling signaling anterograde trans-synaptic signaling cell-cell signaling chemical synaptic transmission cell communication protein homooligomerization cardiac conduction regulation of heart rate by cardiac conduction regulation of heart rate	cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region cellular anatomical entity synaptic membrane sarcolemma postsynaptic specialization membrane postsynaptic specialization organelle cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region cellular anatomical entity synaptic membrane sarcolemma postsynaptic specialization membrane postsynaptic specialization organelle GABA-ergic synapse voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex potassium channel complex membrane protein complex cation channel complex transporter complex transmembrane transporter complex monoatomic ion channel complex neuron spine neuron projection dendritic spine plasma membrane bounded cell projection somatodendritic compartment cell projection dendrite dendritic tree Kv4.3-KChIP1 channel complex cell body neuronal cell body

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR021645	Shal-type voltage-gated potassium channels, N-terminal	Domain
A, B, C, D	IPR000210	BTB/POZ domain	Domain
A, B, C, D	IPR024587	Potassium channel, voltage dependent, Kv4, C-terminal	Domain
A, B, C, D	IPR003968	Potassium channel, voltage dependent, Kv	Family
A, B, C, D	IPR003975	Potassium channel, voltage dependent, Kv4	Family
A, B, C, D	IPR005821	Ion transport domain	Domain
A, B, C, D	IPR004056	Potassium channel, voltage dependent, Kv4.3	Family
A, B, C, D	IPR003131	Potassium channel tetramerisation-type BTB domain	Domain
A, B, C, D	IPR011333	SKP1/BTB/POZ domain superfamily	Homologous Superfamily
A, B, C, D	IPR027359	Voltage-dependent channel domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D	Pharos: Q9UK17	Brugada syndrome Brugada syndrome 9 atrial fibrillation spinocerebellar ataxia type 19/22 Crohn disease autosomal dominant cerebellar ataxia malignant colon neoplasm malignant mesothelioma oligodendroglioma Paroxysmal atrial fibrillation adenoma progressive supranuclear palsy ulcerative colitis colorectal cancer glioblastoma Brugada syndrome Brugada syndrome 9 atrial fibrillation spinocerebellar ataxia type 19/22 Crohn disease autosomal dominant cerebellar ataxia malignant colon neoplasm malignant mesothelioma oligodendroglioma Paroxysmal atrial fibrillation adenoma progressive supranuclear palsy ulcerative colitis colorectal cancer glioblastoma interstitial cystitis lung cancer malignant ependymoma multiple sclerosis ovarian cancer astrocytic tumor atypical teratoid rhabdoid tumor hereditary ataxia Lambert-Eaton myasthenic syndrome lung carcinoma malignant glioma neurodegenerative disease Parkinson disease pituitary cancer transitional cell carcinoma familial atrial fibrillation intellectual disability large cell medulloblastoma

Membrane Protein Annotation: OPM OPM Database Homepage

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

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	K_v4.3 Voltage-gated potassium Channel

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.