2NZ0

Crystal structure of potassium channel Kv4.3 in complex with its regulatory subunit KChIP1

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
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	EF-hand	8042297	3001983	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	EF-hand	8042297	3001983	SCOP2B (2022-06-29)
B	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	EF-hand_7_2	e2nz0A4	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_2	ECOD (1.6)
A	EF-hand_7_10	e2nz0A3	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_10	ECOD (1.6)
C	EF-hand_7_2	e2nz0C4	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_2	ECOD (1.6)
C	EF-hand_7_10	e2nz0C3	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_10	ECOD (1.6)
B	BTB_2	e2nz0B1	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	BTB_2	e2nz0D1	A: a+b two layers	X: POZ domain (From Topology)	H: POZ domain (From Topology)	T: POZ domain	F: BTB_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)
C	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)
B	3.30.710.10	Alpha Beta	2-Layer Sandwich	Potassium Channel Kv1.1	Chain A	CATH (4.3.0)
D	3.30.710.10	Alpha Beta	2-Layer Sandwich	Potassium Channel Kv1.1	Chain A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C	PF13833	EF-hand domain pair (EF-hand_8)	EF-hand domain pair		Domain
A, C	PF13499	EF-hand domain pair (EF-hand_7)	EF-hand domain pair		Domain
B, 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
B, D	PF11601	Shal-type voltage-gated potassium channels, N-terminal (Shal-type)	Shal-type voltage-gated potassium channels, N-terminal	This entry represents the short N-terminal helical domain of Shal-type voltage-gated potassium channels. The domain interacts with Kv channel-interacting proteins to modulate cell surface expression and the function of Kv4 channels. The interaction o ...	This entry represents the short N-terminal helical domain of Shal-type voltage-gated potassium channels. The domain interacts with Kv channel-interacting proteins to modulate cell surface expression and the function of Kv4 channels. The interaction of the N-terminus of Shal-type protein Kv4.2 and the Kv interacting protein KChiP1 forms a structure which is like the structure between calmodulin and its target peptides when they interact. Interactions of an N terminal alpha helix in Kv4.2 and a C terminal alpha helix in KChIP1 are essential for the modulation of Kv4.2 by KChIPs [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	Kv channel-interacting protein 1	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding protein binding transmembrane transporter binding monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity cation binding ion binding binding calcium ion binding metal ion binding small molecule binding protein binding transmembrane transporter binding monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity potassium channel regulator activity channel regulator activity ion channel regulator activity molecular function regulator activity transporter regulator activity	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 trans-synaptic signaling synaptic signaling 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 trans-synaptic signaling synaptic signaling signaling anterograde trans-synaptic signaling cell-cell signaling cellular process chemical synaptic transmission cell communication cellular response to stimulus regulation of signaling regulation of cellular process response to stimulus regulation of signal transduction regulation of response to stimulus regulation of cell communication signal transduction membrane repolarization regulation of biological quality regulation of membrane potential muscle contraction muscle system process regulation of localization regulation of potassium ion transport transport monoatomic ion transmembrane transport potassium ion transmembrane transport regulation of monoatomic ion transmembrane transport metal ion transport monoatomic cation transmembrane transport localization monoatomic ion transport monoatomic cation transport regulation of metal ion transport regulation of transport regulation of monoatomic ion transport inorganic ion transmembrane transport regulation of potassium ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport regulation of transmembrane transport potassium ion transport regulation of monoatomic cation transmembrane transport export from cell export across plasma membrane potassium ion export across plasma membrane	cellular anatomical structure synapse cell junction 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 Kv4.3-KChIP1 channel complex cell periphery cellular anatomical structure synapse cell junction 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 Kv4.3-KChIP1 channel complex cell periphery transmembrane transporter complex monoatomic ion channel complex somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection intracellular anatomical structure cytoplasm cytoplasmic side of plasma membrane cytoplasmic side of membrane side of membrane
B, D	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 cation binding ion binding binding metal ion binding small molecule binding voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization	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 cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane sarcolemma postsynaptic specialization membrane postsynaptic specialization organelle cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region 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, C	IPR028846	Recoverin family	Family
A, C	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
A, C	IPR002048	EF-hand domain	Domain
A, C	IPR011992	EF-hand domain pair	Homologous Superfamily
B, D	IPR021645	Shal-type voltage-gated potassium channels, N-terminal	Domain
B, D	IPR028325	Voltage-gated potassium channel	Family
B, D	IPR000210	BTB/POZ domain	Domain
B, D	IPR024587	Potassium channel, voltage dependent, Kv4, C-terminal	Domain
B, D	IPR003968	Potassium channel, voltage dependent, Kv	Family
B, D	IPR003975	Potassium channel, voltage dependent, Kv4	Family
B, D	IPR005821	Ion transport domain	Domain
B, D	IPR004056	Potassium channel, voltage dependent, Kv4.3	Family
B, D	IPR003131	Potassium channel tetramerisation-type BTB domain	Domain
B, D	IPR011333	SKP1/BTB/POZ domain superfamily	Homologous Superfamily
B, D	IPR027359	Voltage-dependent channel domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, C	Pharos: Q9NZI2	atypical teratoid rhabdoid tumor medulloblastoma subependymal giant cell astrocytoma large cell medulloblastoma Pick disease malignant ependymoma pilocytic astrocytoma
B, D	Pharos: Q9UK17	Brugada syndrome Brugada syndrome 9 spinocerebellar ataxia type 19/22 atrial fibrillation Crohn disease autosomal dominant cerebellar ataxia malignant colon neoplasm malignant mesothelioma oligodendroglioma Paroxysmal atrial fibrillation progressive supranuclear palsy adenoma ulcerative colitis colorectal cancer glioblastoma Brugada syndrome Brugada syndrome 9 spinocerebellar ataxia type 19/22 atrial fibrillation Crohn disease autosomal dominant cerebellar ataxia malignant colon neoplasm malignant mesothelioma oligodendroglioma Paroxysmal atrial fibrillation progressive supranuclear palsy adenoma 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

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.