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- PDB-9g9v: Structure of the human two pore domain potassium ion channel TASK... -

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Basic information

Entry
Database: PDB / ID: 9g9v
TitleStructure of the human two pore domain potassium ion channel TASK-3 (K2P9.1)
ComponentsPotassium channel subfamily K member 9
KeywordsMEMBRANE PROTEIN / K2P / potassium channel / ion channel
Function / homology
Function and homology information


negative regulation of aldosterone secretion / regulation of action potential firing rate / TWIK-releated acid-sensitive K+ channel (TASK) / Phase 4 - resting membrane potential / potassium ion leak channel activity / regulation of resting membrane potential / cellular response to acidic pH / outward rectifier potassium channel activity / sodium channel activity / potassium ion import across plasma membrane ...negative regulation of aldosterone secretion / regulation of action potential firing rate / TWIK-releated acid-sensitive K+ channel (TASK) / Phase 4 - resting membrane potential / potassium ion leak channel activity / regulation of resting membrane potential / cellular response to acidic pH / outward rectifier potassium channel activity / sodium channel activity / potassium ion import across plasma membrane / potassium channel activity / visual perception / potassium ion transport / synaptic vesicle / mitochondrial inner membrane / protein heterodimerization activity / dendrite / metal ion binding / identical protein binding / plasma membrane
Similarity search - Function
Potassium channel subfamily K member 9 / Two pore domain potassium channel, TASK family / Two pore domain potassium channel / Potassium channel domain / Ion channel
Similarity search - Domain/homology
: / CHOLESTEROL HEMISUCCINATE / Potassium channel subfamily K member 9
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.32 Å
AuthorsHall, P.H. / Rodstrom, K.E.J. / Tucker, S.J.
Funding support United Kingdom, 3items
OrganizationGrant numberCountry
Biotechnology and Biological Sciences Research Council (BBSRC)BB/T002018/1 United Kingdom
Biotechnology and Biological Sciences Research Council (BBSRC)BB/S008608/1 United Kingdom
Medical Research Council (MRC, United Kingdom)MR/W017741/1 United Kingdom
CitationJournal: Structure / Year: 2025
Title: Structures of TASK-1 and TASK-3 K2P channels provide insight into their gating and dysfunction in disease.
Authors: Peter Rory Hall / Thibault Jouen-Tachoire / Marcus Schewe / Peter Proks / Thomas Baukrowitz / Elisabeth P Carpenter / Simon Newstead / Karin E J Rödström / Stephen J Tucker /
Abstract: TASK-1 and TASK-3 are pH-sensitive two-pore domain (K2P/KCNK) K channels. Their functional roles make them promising targets for treatment of multiple disorders including sleep apnea, pain, and ...TASK-1 and TASK-3 are pH-sensitive two-pore domain (K2P/KCNK) K channels. Their functional roles make them promising targets for treatment of multiple disorders including sleep apnea, pain, and atrial fibrillation. Mutations in these channels are also associated with neurodevelopmental and hypertensive disorders. A previous crystal structure of TASK-1 revealed a lower "X-gate" as a hotspot for missense gain-of-function (GoF) mutations associated with DDSA (developmental delay with sleep apnea). However, the mechanisms of gating in TASK channels are still not fully understood. Here, we resolve structures for both human TASK-1 and TASK-3 by cryoelectron microscopy (cryo-EM), as well as a recurrent TASK-3 variant (G236R) associated with KCNK9 imprinting syndrome (KIS) (formerly known as Birk-Barel syndrome). Combined with functional studies of the X-gating mechanism, we provide evidence for how a highly conserved gating mechanism becomes defective in disease, and also provide further insight into the pathway of conformational changes that underlie the pH-dependent inhibition of TASK channel activity.
History
DepositionJul 25, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 18, 2024Provider: repository / Type: Initial release
Revision 1.1Jan 15, 2025Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.year / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Potassium channel subfamily K member 9
B: Potassium channel subfamily K member 9
hetero molecules


Theoretical massNumber of molelcules
Total (without water)62,75911
Polymers60,6172
Non-polymers2,1429
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Potassium channel subfamily K member 9 / Acid-sensitive potassium channel protein TASK-3 / TWIK-related acid-sensitive K(+) channel 3 / Two ...Acid-sensitive potassium channel protein TASK-3 / TWIK-related acid-sensitive K(+) channel 3 / Two pore potassium channel KT3.2 / Two pore K(+) channel KT3.2


Mass: 30308.301 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Details: M1 to D259, with a HRV 3C protease site. Fused purification tags were cleaved prior to EM sample preparation.
Source: (gene. exp.) Homo sapiens (human) / Gene: KCNK9, TASK3 / Plasmid: pFB-C3C10HF-LIC / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9NPC2
#2: Chemical
ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C31H50O4
#3: Chemical
ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: K
Has ligand of interestN
Has protein modificationN

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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: K2P9.1 homodimer / Type: COMPLEX
Details: Protein generated by removal of the 10xHis and FLAG purification tags with 3C protease cleavage
Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.61 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Strain: Sf9
Buffer solutionpH: 7.5
Details: 20 mM HEPES pH 7.5, 200 mM KCl, 0.12% w/v DM, 0.012% w/v CHS
SpecimenConc.: 8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Monodisperse sample
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: Grid blotted for 3 seconds

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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 magnification: 105000 X / Nominal defocus max: 2700 nm / Nominal defocus min: 1200 nm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 39.56 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 21363
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.2.1particle selection
2EPUimage acquisition
4cryoSPARC4.2.1CTF correction
9PHENIX1.20.1-4487model refinement
10cryoSPARC4.2.1initial Euler assignment
11cryoSPARC4.4.1final Euler assignment
13cryoSPARC4.4.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.32 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 93760 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL / Details: An initial model was built manually in COOT

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