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- PDB-8f1d: Voltage-gated potassium channel Kv3.1 apo -

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Basic information

Entry
Database: PDB / ID: 8f1d
TitleVoltage-gated potassium channel Kv3.1 apo
ComponentsPotassium voltage-gated channel subfamily C member 1
KeywordsTRANSPORT PROTEIN / ion channel / positive modulator / voltage gated / voltage gated potassium channel
Function / homology
Function and homology information


response to nerve growth factor / globus pallidus development / response to auditory stimulus / response to fibroblast growth factor / response to potassium ion / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / positive regulation of potassium ion transmembrane transport / delayed rectifier potassium channel activity / Voltage gated Potassium channels ...response to nerve growth factor / globus pallidus development / response to auditory stimulus / response to fibroblast growth factor / response to potassium ion / corpus callosum development / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / positive regulation of potassium ion transmembrane transport / delayed rectifier potassium channel activity / Voltage gated Potassium channels / response to light intensity / optic nerve development / neuronal cell body membrane / response to amine / action potential / kinesin binding / calyx of Held / voltage-gated potassium channel activity / axolemma / voltage-gated potassium channel complex / axon terminus / dendrite membrane / potassium ion transmembrane transport / cerebellum development / protein tetramerization / potassium ion transport / protein homooligomerization / response to toxic substance / cellular response to xenobiotic stimulus / presynaptic membrane / postsynaptic membrane / transmembrane transporter binding / cell surface / plasma membrane
Similarity search - Function
Potassium channel, voltage dependent, Kv3.1 / Potassium channel, voltage dependent, Kv3 / Potassium channel, voltage dependent, Kv / Potassium channel tetramerisation-type BTB domain / BTB/POZ domain / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / Voltage-dependent channel domain superfamily / SKP1/BTB/POZ domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
CHOLESTEROL / : / Voltage-gated potassium channel KCNC1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.94 Å
AuthorsChen, Y. / Ishchenko, A.
Funding support United States, 1items
OrganizationGrant numberCountry
Merck & Co. United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Identification, structural, and biophysical characterization of a positive modulator of human Kv3.1 channels.
Authors: Yun-Ting Chen / Mee Ra Hong / Xin-Jun Zhang / James Kostas / Yuxing Li / Richard L Kraus / Vincent P Santarelli / Deping Wang / Yacob Gomez-Llorente / Alexei Brooun / Corey Strickland / ...Authors: Yun-Ting Chen / Mee Ra Hong / Xin-Jun Zhang / James Kostas / Yuxing Li / Richard L Kraus / Vincent P Santarelli / Deping Wang / Yacob Gomez-Llorente / Alexei Brooun / Corey Strickland / Stephen M Soisson / Daniel J Klein / Anthony T Ginnetti / Michael J Marino / Shawn J Stachel / Andrii Ishchenko /
Abstract: Voltage-gated potassium channels (Kv) are tetrameric membrane proteins that provide a highly selective pathway for potassium ions (K) to diffuse across a hydrophobic cell membrane. These unique ...Voltage-gated potassium channels (Kv) are tetrameric membrane proteins that provide a highly selective pathway for potassium ions (K) to diffuse across a hydrophobic cell membrane. These unique voltage-gated cation channels detect changes in membrane potential and, upon activation, help to return the depolarized cell to a resting state during the repolarization stage of each action potential. The Kv3 family of potassium channels is characterized by a high activation potential and rapid kinetics, which play a crucial role for the fast-spiking neuronal phenotype. Mutations in the Kv3.1 channel have been shown to have implications in various neurological diseases like epilepsy and Alzheimer's disease. Moreover, disruptions in neuronal circuitry involving Kv3.1 have been correlated with negative symptoms of schizophrenia. Here, we report the discovery of a novel positive modulator of Kv3.1, investigate its biophysical properties, and determine the cryo-EM structure of the compound in complex with Kv3.1. Structural analysis reveals the molecular determinants of positive modulation in Kv3.1 channels by this class of compounds and provides additional opportunities for rational drug design for the treatment of associated neurological disorders.
History
DepositionNov 4, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 25, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Potassium voltage-gated channel subfamily C member 1
B: Potassium voltage-gated channel subfamily C member 1
C: Potassium voltage-gated channel subfamily C member 1
D: Potassium voltage-gated channel subfamily C member 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)252,94616
Polymers250,9814
Non-polymers1,96512
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Potassium voltage-gated channel subfamily C member 1 / NGK2 / Voltage-gated potassium channel subunit Kv3.1 / Voltage-gated potassium channel subunit Kv4


Mass: 62745.266 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KCNC1 / Cell line (production host): Expi293, human-derived / Production host: Homo sapiens (human) / References: UniProt: P48547
#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn
#3: Chemical
ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C27H46O
#4: Chemical
ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: K
Has ligand of interestN

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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: potassium voltage-gated channel / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.24 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293, human-derived / Plasmid: Mammalian expression vector EGFP-MCS-pcDNA3.1
Buffer solutionpH: 8
SpecimenConc.: 3.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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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 / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 42.5 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1937733
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 2.94 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 140000 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00413292
ELECTRON MICROSCOPYf_angle_d0.48918088
ELECTRON MICROSCOPYf_dihedral_angle_d10.5044724
ELECTRON MICROSCOPYf_chiral_restr0.0391992
ELECTRON MICROSCOPYf_plane_restr0.0042244

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