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- PDB-9oup: Native GABA-A receptor from rat cerebella, beta2-alpha1-beta1-alp... -

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Basic information

Entry
Database: PDB / ID: 9oup
TitleNative GABA-A receptor from rat cerebella, beta2-alpha1-beta1-alpha6-gamma2 subtype, in complex with GABA
Components
  • (Gamma-aminobutyric acid receptor subunit alpha- ...) x 2
  • (Gamma-aminobutyric acid receptor subunit beta- ...) x 2
  • 8E3 fab heavy chain
  • 8E3 fab light chain
  • Gamma-aminobutyric acid receptor subunit gamma-2
KeywordsMEMBRANE PROTEIN / neurotransmitter receptor / cys-loop receptor / ligand-gated ion channel
Function / homology
Function and homology information


cerebellar Golgi cell to granule cell synapse / GABA receptor activation / inhibitory extracellular ligand-gated monoatomic ion channel activity / ovulation cycle / diazepam binding / : / response to methamphetamine hydrochloride / inhibitory synapse / response to auditory stimulus / GABA receptor complex ...cerebellar Golgi cell to granule cell synapse / GABA receptor activation / inhibitory extracellular ligand-gated monoatomic ion channel activity / ovulation cycle / diazepam binding / : / response to methamphetamine hydrochloride / inhibitory synapse / response to auditory stimulus / GABA receptor complex / monoatomic anion channel activity / GABA receptor binding / cellular response to histamine / inner ear receptor cell development / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / GABA-A receptor activity / innervation / heterocyclic compound binding / chloride transport / response to anesthetic / postsynaptic specialization membrane / gamma-aminobutyric acid signaling pathway / neuronal cell body membrane / central nervous system neuron development / synaptic transmission, GABAergic / cellular response to zinc ion / chloride channel activity / adult behavior / cochlea development / ligand-gated monoatomic ion channel activity / chloride channel complex / neuron development / monoatomic ion transport / response to progesterone / presynaptic active zone membrane / dendrite membrane / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / cytoplasmic vesicle membrane / chloride transmembrane transport / hippocampal mossy fiber to CA3 synapse / post-embryonic development / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / GABA-ergic synapse / Schaffer collateral - CA1 synapse / response to toxic substance / nuclear envelope / presynaptic membrane / dendritic spine / chemical synaptic transmission / response to ethanol / postsynaptic membrane / signaling receptor complex / postsynapse / axon / dendrite / protein-containing complex binding / glutamatergic synapse / cell surface / plasma membrane
Similarity search - Function
Gamma-aminobutyric-acid A receptor, alpha 6 subunit / Gamma-aminobutyric-acid A receptor, gamma 2 subunit / Gamma-aminobutyric acid receptor subunit gamma-1/4 / Gamma-aminobutyric-acid A receptor, alpha 1 subunit / : / Gamma-aminobutyric-acid A receptor, alpha subunit / : / Gamma-aminobutyric-acid A receptor, beta subunit / Gamma-aminobutyric acid A receptor/Glycine receptor alpha / Neurotransmitter-gated ion-channel, conserved site ...Gamma-aminobutyric-acid A receptor, alpha 6 subunit / Gamma-aminobutyric-acid A receptor, gamma 2 subunit / Gamma-aminobutyric acid receptor subunit gamma-1/4 / Gamma-aminobutyric-acid A receptor, alpha 1 subunit / : / Gamma-aminobutyric-acid A receptor, alpha subunit / : / Gamma-aminobutyric-acid A receptor, beta subunit / Gamma-aminobutyric acid A receptor/Glycine receptor alpha / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain / Neurotransmitter-gated ion-channel ligand-binding domain superfamily / Neurotransmitter-gated ion-channel ligand binding domain
Similarity search - Domain/homology
GAMMA-AMINO-BUTANOIC ACID / Gamma-aminobutyric acid receptor subunit beta-1 / Gamma-aminobutyric acid receptor subunit gamma-2 / Gamma-aminobutyric acid receptor subunit alpha-6 / Gamma-aminobutyric acid receptor subunit alpha-1 / Gamma-aminobutyric acid receptor subunit beta-2
Similarity search - Component
Biological speciesMus musculus (house mouse)
Rattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.82 Å
AuthorsSun, C. / Gouaux, E.
Funding support United States, 1items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2026
Title: Molecular assemblies and pharmacology of cerebellar GABA receptors.
Authors: Chang Sun / Jennifer N Jahncke / Kevin M Wright / Eric Gouaux /
Abstract: GABA receptors (GABARs) mediate fast inhibitory neurotransmission in the brain and are assembled from 19 subunit isoforms into multiple pentameric assemblies. Although α1-containing GABARs are ...GABA receptors (GABARs) mediate fast inhibitory neurotransmission in the brain and are assembled from 19 subunit isoforms into multiple pentameric assemblies. Although α1-containing GABARs are broadly expressed and are pharmacologically important, the molecular diversity of native α1-based assemblies in specific brain regions remains incompletely understood. Here, we use immunofluorescence, mass spectrometry, and cryogenic electron microscopy (cryo-EM) to characterize the spatial distribution, subunit composition, and structural architecture of native α1-containing GABARs in the rat cerebellum. Confocal microscopy reveals robust colocalization of α1 and γ2 subunits across cerebellar layers, including prominent labeling at glomerular synapses. Biochemical purification and proteomic analysis identify a range of α, β, and γ subunits, along with abundant α6 and δ subunits. Using cryo-EM and automated subunit identification, we resolve eight α1-containing receptor assemblies, including the first structure of α6-containing receptors. We further determine the binding mode of the α6-selective pyrazoloquinolinone modulator PZ-II-029 at the α/γ interface, showing ligand-induced expansion of the entire extracellular domain (ECD). Together, our study defines the structure and subunit composition of the α1-containing cerebellar GABARs and elaborates the molecular interactions between native receptors and pyrazoloquinolinone, thereby laying the groundwork for brain region and subunit-specific pharmacology.
History
DepositionMay 29, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 18, 2026Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 18, 2026Data 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: Gamma-aminobutyric acid receptor subunit alpha-1
B: Gamma-aminobutyric acid receptor subunit beta-1
C: Gamma-aminobutyric acid receptor subunit alpha-6
D: Gamma-aminobutyric acid receptor subunit gamma-2
E: Gamma-aminobutyric acid receptor subunit beta-2
H: 8E3 fab heavy chain
L: 8E3 fab light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)318,92218
Polymers313,8027
Non-polymers5,12011
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Gamma-aminobutyric acid receptor subunit alpha- ... , 2 types, 2 molecules AC

#1: Protein Gamma-aminobutyric acid receptor subunit alpha-1 / GABA(A) receptor subunit alpha-1 / GABAAR subunit alpha-1


Mass: 51818.516 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Rattus norvegicus (Norway rat) / References: UniProt: P62813
#3: Protein Gamma-aminobutyric acid receptor subunit alpha-6 / GABA(A) receptor subunit alpha-6 / GABAAR subunit alpha-6


Mass: 51232.020 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Rattus norvegicus (Norway rat) / References: UniProt: P30191

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Gamma-aminobutyric acid receptor subunit beta- ... , 2 types, 2 molecules BE

#2: Protein Gamma-aminobutyric acid receptor subunit beta-1 / GABA(A) receptor subunit beta-1 / GABAAR subunit beta-1


Mass: 54133.164 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Rattus norvegicus (Norway rat) / References: UniProt: P15431
#5: Protein Gamma-aminobutyric acid receptor subunit beta-2 / GABA(A) receptor subunit beta-2 / GABAAR subunit beta-2


Mass: 54697.297 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Rattus norvegicus (Norway rat) / References: UniProt: P63138

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Antibody , 2 types, 2 molecules HL

#6: Antibody 8E3 fab heavy chain


Mass: 24159.895 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Spodoptera frugiperda (fall armyworm)
#7: Antibody 8E3 fab light chain


Mass: 23624.080 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Spodoptera frugiperda (fall armyworm)

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Protein / Non-polymers , 2 types, 3 molecules D

#11: Chemical ChemComp-ABU / GAMMA-AMINO-BUTANOIC ACID / GAMMA(AMINO)-BUTYRIC ACID


Mass: 103.120 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C4H9NO2 / Feature type: SUBJECT OF INVESTIGATION / Comment: neurotransmitter, inhibitor*YM
#4: Protein Gamma-aminobutyric acid receptor subunit gamma-2 / GABA(A) receptor subunit gamma-2 / GABAAR subunit gamma-2


Mass: 54136.945 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Rattus norvegicus (Norway rat) / References: UniProt: P18508

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Sugars , 4 types, 9 molecules

#8: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-alpha-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1235.105 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3[DManpa1-3DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,7,6/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1_f3-g1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#9: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#10: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#12: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Details

Has ligand of interestY
Has protein modificationY

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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: Native GABA-A receptor from rat cerebella, beta2-alpha1-beta1-alpha6-gamma2 subtype, in complex with GABA
Type: COMPLEX / Entity ID: #1-#7 / Source: MULTIPLE SOURCES
Molecular weightValue: 0.3 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Buffer solutionpH: 8
SpecimenConc.: 0.05 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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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: 2500 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 43 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.82 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 251382 / Symmetry type: POINT

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