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- PDB-8pet: Cryo-EM structure of the full-length human alpha1beta3 GABA(A) re... -

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Basic information

Entry
Database: PDB / ID: 8pet
TitleCryo-EM structure of the full-length human alpha1beta3 GABA(A) receptor (babba arrangement) in complex with nanobody Nb25, expressed with a 5-fold excess of beta3 over alpha1
Components
  • (Gamma-aminobutyric acid receptor subunit ...) x 2
  • Nanobody Nb25
KeywordsMEMBRANE PROTEIN / Neurotransmitter receptor / pentameric ligand-gated ion channel / Type-A GABA receptor / GABA-A receptor
Function / homology
Function and homology information


circadian sleep/wake cycle, REM sleep / reproductive behavior / GABA receptor complex / hard palate development / cellular response to histamine / GABA receptor activation / inner ear receptor cell development / inhibitory synapse assembly / GABA-A receptor activity / GABA-gated chloride ion channel activity ...circadian sleep/wake cycle, REM sleep / reproductive behavior / GABA receptor complex / hard palate development / cellular response to histamine / GABA receptor activation / inner ear receptor cell development / inhibitory synapse assembly / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / innervation / response to anesthetic / postsynaptic specialization membrane / inhibitory postsynaptic potential / gamma-aminobutyric acid signaling pathway / synaptic transmission, GABAergic / cellular response to zinc ion / exploration behavior / motor behavior / roof of mouth development / Signaling by ERBB4 / cochlea development / social behavior / chloride channel complex / dendrite membrane / chloride transmembrane transport / cytoplasmic vesicle membrane / cerebellum development / learning / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / GABA-ergic synapse / memory / dendritic spine / postsynaptic membrane / postsynapse / response to xenobiotic stimulus / cell surface / signal transduction / identical protein binding / plasma membrane
Similarity search - Function
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 ...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
DECANE / Chem-PIO / HEXADECANE / Gamma-aminobutyric acid receptor subunit alpha-1 / Gamma-aminobutyric acid receptor subunit beta-3
Similarity search - Component
Biological speciesHomo sapiens (human)
Lama glama (llama)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.6 Å
AuthorsSente, A. / Malinauskas, T. / Naydenova, K. / Hardwick, S.W. / Chirgadze, D.Y. / Aricescu, A.R.
Funding support United Kingdom, United States, 5items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MR/L009609/1 United Kingdom
Medical Research Council (MRC, United Kingdom)MC_UP_1201/15 United Kingdom
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R01GM135550-01 United States
Medical Research Council (MRC, United Kingdom)MC_EX_MR/T046279/1 United Kingdom
National Science Foundation (NSF, United States)2014862 United States
CitationJournal: To Be Published
Title: Subunit abundance shapes GABAA receptor stoichiometry
Authors: Sente, A. / Malinauskas, T. / Naydenova, K. / Hardwick, S.W. / Chirgadze, D.Y. / Aricescu, A.R.
History
DepositionJun 14, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 2, 2025Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 2025Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Jul 2, 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

Downloads & links

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Assembly

Deposited unit
A: Gamma-aminobutyric acid receptor subunit alpha-1
B: Gamma-aminobutyric acid receptor subunit beta-3
D: Gamma-aminobutyric acid receptor subunit beta-3
C: Gamma-aminobutyric acid receptor subunit alpha-1
E: Gamma-aminobutyric acid receptor subunit beta-3
F: Nanobody Nb25
hetero molecules


Theoretical massNumber of molelcules
Total (without water)300,53831
Polymers290,9916
Non-polymers9,54625
Water1,51384
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

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Gamma-aminobutyric acid receptor subunit ... , 2 types, 5 molecules ACBDE

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


Mass: 54100.066 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GABRA1 / Cell line (production host): Expi293 / Production host: Homo sapiens (human) / References: UniProt: P14867
#2: Protein Gamma-aminobutyric acid receptor subunit beta-3 / GABA(A) receptor subunit beta-3 / GABAAR subunit beta-3


Mass: 55954.316 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GABRB3 / Cell line (production host): Expi293 / Production host: Homo sapiens (human) / References: UniProt: P28472

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Antibody , 1 types, 1 molecules F

#3: Antibody Nanobody Nb25


Mass: 14928.326 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Lama glama (llama) / Production host: Escherichia coli (E. coli)

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Sugars , 2 types, 8 molecules

#4: Polysaccharide
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2- ...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: 910.823 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3/a4-b1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#5: 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.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam 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
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE

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Non-polymers , 5 types, 101 molecules

#6: Chemical ChemComp-R16 / HEXADECANE


Mass: 226.441 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C16H34
#7: Chemical ChemComp-PIO / [(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate / dioctanoyl l-alpha-phosphatidyl-d-myo-inositol 4,5-diphosphate


Mass: 746.566 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C25H49O19P3
#8: Chemical
ChemComp-D10 / DECANE


Mass: 142.282 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C10H22
#9: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#10: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 84 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN
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: Cryo-EM structure of the full-length human alpha1beta3 GABA(A) receptor (babba arrangement) in complex with nanobody Nb25, expressed with a 5-fold excess of beta3 over alpha1
Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293
Buffer solutionpH: 7.6
Buffer component
IDConc.NameFormulaBuffer-ID
1300 mMsodium chlorideNaCl1
250 mMHEPES1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 287 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 magnification: 130000 X / Nominal defocus max: 2100 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 50.63 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 10020
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
1Warpparticle selection
2EPUimage acquisition
4CTFFIND4.1.13CTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10cryoSPARC3.2initial Euler assignment
11cryoSPARC4.1.2final Euler assignment
12cryoSPARC4.1.2classification
13cryoSPARC4.1.23D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2175702
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 213401 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00415752
ELECTRON MICROSCOPYf_angle_d0.4521368
ELECTRON MICROSCOPYf_dihedral_angle_d9.9195850
ELECTRON MICROSCOPYf_chiral_restr0.042477
ELECTRON MICROSCOPYf_plane_restr0.0042580

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