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- PDB-7e83: CryoEM structure of the human Kv4.2-KChIP1 complex, intracellular... -

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Basic information

Entry
Database: PDB / ID: 7.0E+83
TitleCryoEM structure of the human Kv4.2-KChIP1 complex, intracellular region
Components
  • Kv channel-interacting protein 1
  • Potassium voltage-gated channel subfamily D member 2
KeywordsMEMBRANE PROTEIN / ion channel
Function / homology
Function and homology information


Kv4.2-KChIP2 channel complex / A-type (transient outward) potassium channel activity / Phase 1 - inactivation of fast Na+ channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / membrane repolarization / Voltage gated Potassium channels / regulation of potassium ion transmembrane transport / postsynaptic specialization membrane / anchoring junction / action potential ...Kv4.2-KChIP2 channel complex / A-type (transient outward) potassium channel activity / Phase 1 - inactivation of fast Na+ channels / voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / membrane repolarization / Voltage gated Potassium channels / regulation of potassium ion transmembrane transport / postsynaptic specialization membrane / anchoring junction / action potential / regulation of heart contraction / neuronal cell body membrane / voltage-gated potassium channel activity / potassium channel activity / plasma membrane raft / locomotor rhythm / potassium channel regulator activity / neuronal action potential / GABA-ergic synapse / potassium ion transmembrane transport / voltage-gated potassium channel complex / sensory perception of pain / muscle contraction / protein homooligomerization / cytoplasmic side of plasma membrane / cellular response to hypoxia / chemical synaptic transmission / postsynaptic membrane / perikaryon / transmembrane transporter binding / dendritic spine / neuronal cell body / glutamatergic synapse / calcium ion binding / dendrite / metal ion binding / plasma membrane / cytoplasm
Similarity search - Function
Potassium channel, voltage dependent, Kv4.2 / Potassium channel, voltage dependent, Kv4 / Shal-type voltage-gated potassium channels, N-terminal / Potassium channel, voltage dependent, Kv4, C-terminal / Shal-type voltage-gated potassium channels, N-terminal / Domain of unknown function (DUF3399) / Recoverin family / Potassium channel, voltage dependent, Kv / Potassium channel tetramerisation-type BTB domain / BTB/POZ domain ...Potassium channel, voltage dependent, Kv4.2 / Potassium channel, voltage dependent, Kv4 / Shal-type voltage-gated potassium channels, N-terminal / Potassium channel, voltage dependent, Kv4, C-terminal / Shal-type voltage-gated potassium channels, N-terminal / Domain of unknown function (DUF3399) / Recoverin family / Potassium channel, voltage dependent, Kv / Potassium channel tetramerisation-type BTB domain / BTB/POZ domain / EF-hand domain pair / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / Voltage-dependent channel domain superfamily / SKP1/BTB/POZ domain superfamily / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / EF-hand calcium-binding domain profile. / EF-hand domain / Ion transport domain / Ion transport protein / EF-hand domain pair
Similarity search - Domain/homology
Kv channel-interacting protein 1 / Potassium voltage-gated channel subfamily D member 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsKise, Y. / Nureki, O.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS) Japan
CitationJournal: Nature / Year: 2021
Title: Structural basis of gating modulation of Kv4 channel complexes.
Authors: Yoshiaki Kise / Go Kasuya / Hiroyuki H Okamoto / Daichi Yamanouchi / Kan Kobayashi / Tsukasa Kusakizako / Tomohiro Nishizawa / Koichi Nakajo / Osamu Nureki /
Abstract: Modulation of voltage-gated potassium (Kv) channels by auxiliary subunits is central to the physiological function of channels in the brain and heart. Native Kv4 tetrameric channels form ...Modulation of voltage-gated potassium (Kv) channels by auxiliary subunits is central to the physiological function of channels in the brain and heart. Native Kv4 tetrameric channels form macromolecular ternary complexes with two auxiliary β-subunits-intracellular Kv channel-interacting proteins (KChIPs) and transmembrane dipeptidyl peptidase-related proteins (DPPs)-to evoke rapidly activating and inactivating A-type currents, which prevent the backpropagation of action potentials. However, the modulatory mechanisms of Kv4 channel complexes remain largely unknown. Here we report cryo-electron microscopy structures of the Kv4.2-DPP6S-KChIP1 dodecamer complex, the Kv4.2-KChIP1 and Kv4.2-DPP6S octamer complexes, and Kv4.2 alone. The structure of the Kv4.2-KChIP1 complex reveals that the intracellular N terminus of Kv4.2 interacts with its C terminus that extends from the S6 gating helix of the neighbouring Kv4.2 subunit. KChIP1 captures both the N and the C terminus of Kv4.2. In consequence, KChIP1 would prevent N-type inactivation and stabilize the S6 conformation to modulate gating of the S6 helices within the tetramer. By contrast, unlike the reported auxiliary subunits of voltage-gated channel complexes, DPP6S interacts with the S1 and S2 helices of the Kv4.2 voltage-sensing domain, which suggests that DPP6S stabilizes the conformation of the S1-S2 helices. DPP6S may therefore accelerate the voltage-dependent movement of the S4 helices. KChIP1 and DPP6S do not directly interact with each other in the Kv4.2-KChIP1-DPP6S ternary complex. Thus, our data suggest that two distinct modes of modulation contribute in an additive manner to evoke A-type currents from the native Kv4 macromolecular complex.
History
DepositionFeb 28, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Oct 13, 2021Provider: repository / Type: Initial release
Revision 1.1Feb 16, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Jun 5, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Assembly

Deposited unit
C: Potassium voltage-gated channel subfamily D member 2
E: Kv channel-interacting protein 1
A: Potassium voltage-gated channel subfamily D member 2
B: Kv channel-interacting protein 1
D: Potassium voltage-gated channel subfamily D member 2
F: Kv channel-interacting protein 1
G: Potassium voltage-gated channel subfamily D member 2
H: Kv channel-interacting protein 1


Theoretical massNumber of molelcules
Total (without water)307,9958
Polymers307,9958
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area39360 Å2
ΔGint-249 kcal/mol
Surface area69250 Å2

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Components

#1: Protein
Potassium voltage-gated channel subfamily D member 2 / Voltage-gated potassium channel subunit Kv4.2


Mass: 55755.738 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KCND2, KIAA1044 / Production host: Homo sapiens (human) / References: UniProt: Q9NZV8
#2: Protein
Kv channel-interacting protein 1 / KChIP1 / A-type potassium channel modulatory protein 1 / Potassium channel-interacting protein 1 / ...KChIP1 / A-type potassium channel modulatory protein 1 / Potassium channel-interacting protein 1 / Vesicle APC-binding protein


Mass: 21242.941 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KCNIP1, KCHIP1, VABP / Production host: Homo sapiens (human) / References: UniProt: Q9NZI2

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: CryoEM structure of the human Kv4.2-KChIP1 complex / Type: CELL / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 48 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19_4092: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 434296 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00313004
ELECTRON MICROSCOPYf_angle_d0.59317536
ELECTRON MICROSCOPYf_dihedral_angle_d4.271700
ELECTRON MICROSCOPYf_chiral_restr0.0391820
ELECTRON MICROSCOPYf_plane_restr0.0042308

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