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- PDB-9mh8: CryoEM structure of G protein-gated inwardly rectifying potassium... -

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Basic information

Entry
Database: PDB / ID: 9mh8
TitleCryoEM structure of G protein-gated inwardly rectifying potassium channel GIRK2 R92F (State 2)
ComponentsG protein-activated inward rectifier potassium channel 2
KeywordsMEMBRANE PROTEIN / G protein gated-inwardly rectifying potassium channels
Function / homology
Function and homology information


G-protein activated inward rectifier potassium channel activity / inward rectifier potassium channel complex
Similarity search - Function
Potassium channel, inwardly rectifying, Kir3.2 / Potassium channel, inwardly rectifying, transmembrane domain / Inward rectifier potassium channel transmembrane domain / Potassium channel, inwardly rectifying, Kir, cytoplasmic / Potassium channel, inwardly rectifying, Kir / Inward rectifier potassium channel, C-terminal / Inward rectifier potassium channel C-terminal domain / Immunoglobulin E-set
Similarity search - Domain/homology
G protein-activated inward rectifier potassium channel 2
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.62 Å
AuthorsNguyen, H. / Mount, J. / Yuan, P. / Slesinger, P.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Alcohol Abuse and Alcoholism (NIH/NIAAA)5R01AA018734-13 United States
CitationJournal: To Be Published
Title: Key residue Unlocks Dual PIP2-Dependent and Independent Gating in G Protein-Gated Inwardly Rectifying Potassium Channels
Authors: Nguyen, H. / Mount, J. / Hutchinson, K. / Zhao, Y. / Zhao, Y. / Glaaser, I. / Yuan, P. / Schlessinger, A. / Slesinger, P.
History
DepositionDec 11, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 10, 2025Provider: repository / Type: Initial release
Revision 1.0Dec 10, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Dec 10, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Dec 10, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Dec 10, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Dec 10, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Dec 10, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: G protein-activated inward rectifier potassium channel 2
B: G protein-activated inward rectifier potassium channel 2
C: G protein-activated inward rectifier potassium channel 2
D: G protein-activated inward rectifier potassium channel 2


Theoretical massNumber of molelcules
Total (without water)194,7414
Polymers194,7414
Non-polymers00
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
G protein-activated inward rectifier potassium channel 2 / Potassium channel / inwardly rectifying subfamily J member 6


Mass: 48685.371 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Kcnj6 / Production host: Komagataella pastoris (fungus) / References: UniProt: Q3UTV4
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: G protein-gated inwardly rectifying potassium channel 2 R92F (State 2)
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Komagataella pastoris (fungus)
Buffer solutionpH: 7.5
SpecimenConc.: 8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 80 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2300 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 53.92 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 2 / Num. of real images: 20083

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Processing

EM software
IDNameVersionCategory
7Coot0.9.8.1model fitting
19PHENIX1.20.1model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.62 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 753746 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 6XEU

6xeu


Pdb chain-ID: A / Accession code: 6XEU / Source name: PDB / Type: experimental model

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