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- PDB-9fgc: Cryo-EM structure of the full-length alpha1beta3gamma2 GABA(A) re... -

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Basic information

Entry
Database: PDB / ID: 9fgc
TitleCryo-EM structure of the full-length alpha1beta3gamma2 GABA(A) receptor in SMALPs bound to one PIP2 molecule at chain alpha1-D and in complex with Mb38
Components
  • (Gamma-aminobutyric acid receptor subunit ...) x 3
  • Megabody-38,Outer membrane protein
KeywordsMEMBRANE PROTEIN / GABA / neurotransmission / gating cycle / time-resolved cryo-EM
Function / homology
Function and homology information


benzodiazepine receptor activity / GABA receptor complex / cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / gamma-aminobutyric acid signaling pathway / postsynaptic specialization membrane ...benzodiazepine receptor activity / GABA receptor complex / cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / gamma-aminobutyric acid signaling pathway / postsynaptic specialization membrane / synaptic transmission, GABAergic / transmembrane transporter complex / chloride channel activity / adult behavior / roof of mouth development / Signaling by ERBB4 / regulation of postsynaptic membrane potential / chloride channel complex / dendrite membrane / cytoplasmic vesicle membrane / chloride transmembrane transport / post-embryonic development / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / GABA-ergic synapse / dendritic spine / postsynaptic membrane / postsynapse / neuron projection / axon / synapse / signal transduction / identical protein binding / plasma membrane
Similarity search - Function
SabA, N-terminal extracellular adhesion domain / SabA N-terminal extracellular adhesion domain / Outer membrane protein, Helicobacter / Helicobacter outer membrane protein / 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, beta subunit / Gamma-aminobutyric-acid A receptor, alpha subunit ...SabA, N-terminal extracellular adhesion domain / SabA N-terminal extracellular adhesion domain / Outer membrane protein, Helicobacter / Helicobacter outer membrane protein / 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, beta subunit / Gamma-aminobutyric-acid A receptor, alpha subunit / : / Gamma-aminobutyric acid A receptor/Glycine receptor alpha / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / 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 / Outer membrane protein / Gamma-aminobutyric acid receptor subunit alpha-1 / Gamma-aminobutyric acid receptor subunit gamma-2 / Gamma-aminobutyric acid receptor subunit beta-3
Similarity search - Component
Biological speciesHomo sapiens (human)
Lama glama (llama)
Helicobacter pylori G27 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsMihaylov, D.B. / Malinauskas, T. / Aricescu, A.R.
Funding support United Kingdom, United States, 6items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MC_UP_1201/15 United Kingdom
Cancer Research UKDRCRPG-May23/100002 United Kingdom
Medical Research Council (MRC, United Kingdom)MR/L009609/1 United Kingdom
Medical Research Council (MRC, United Kingdom)MC_EX_MR/T046279/1 United Kingdom
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R01-GM135550 United States
National Science Foundation (NSF, United States)NeuroNex 2014862 United States
CitationJournal: To Be Published
Title: Cryo-EM structure of the full-length alpha1beta3gamma2 GABA(A) receptor in SMALPs bound to one PIP2 molecule at chain alpha1-D and in complex with Mb38
Authors: Mihaylov, D.B. / Malinauskas, T. / Aricescu, A.R.
History
DepositionMay 23, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 4, 2025Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 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
C: Gamma-aminobutyric acid receptor subunit gamma-2
D: Gamma-aminobutyric acid receptor subunit alpha-1
E: Gamma-aminobutyric acid receptor subunit beta-3
F: Megabody-38,Outer membrane protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)336,16615
Polymers329,4296
Non-polymers6,7379
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

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Gamma-aminobutyric acid receptor subunit ... , 3 types, 5 molecules ADBEC

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


Mass: 52916.602 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GABRA1 / Plasmid: pcDNA4-TO-Zeocin / Details (production host): stable transfection / Cell (production host): epithelial-like / Cell line (production host): HEK293S-TetR / Organ (production host): kidney / Production host: Homo sapiens (human) / Tissue (production host): kidney; embryo / References: UniProt: P14867
#2: Protein Gamma-aminobutyric acid receptor subunit beta-3 / GABA(A) receptor subunit beta-3


Mass: 54444.578 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GABRB3 / Plasmid: pcDNA4-TO-hygromycin-B / Details (production host): stable transfection / Cell (production host): epithelial-like / Cell line (production host): HEK293S-TetR / Organ (production host): kidney / Production host: Homo sapiens (human) / Tissue (production host): kidney; embryo / References: UniProt: P28472
#3: Protein Gamma-aminobutyric acid receptor subunit gamma-2 / GABA(A) receptor subunit gamma-2


Mass: 56922.055 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GABRG2 / Plasmid: pcDNA4-TO-Geneticin / Details (production host): stable transfection / Cell (production host): epithelial-like / Cell line (production host): HEK293S-TetR / Organ (production host): kidney / Production host: Homo sapiens (human) / Tissue (production host): kidney; embryo / References: UniProt: P18507

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Antibody , 1 types, 1 molecules F

#4: Antibody Megabody-38,Outer membrane protein


Mass: 57784.301 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Lama glama (llama), (gene. exp.) Helicobacter pylori G27 (bacteria)
Plasmid: pMESD2 / Gene: hopQ, HPG27_1120 / Production host: Escherichia coli 0.1197 (bacteria) / Strain (production host): WK6 su- / References: UniProt: B5Z8H1

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Sugars , 5 types, 7 molecules

#5: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[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: 1721.527 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-2DManpa1-3[DManpa1-2DManpa1-6[DManpa1-3]DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,10,9/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-g1_d2-e1_e2-f1_g3-h1_g6-i1_i2-j1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][b-D-Manp]{[(2+1)][b-D-Manp]{}}}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}}}}}}LINUCSPDB-CARE
#6: 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.: 2
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
#7: Polysaccharide alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D- ...alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1072.964 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3DManpa1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3/a4-b1_b4-c1_c3-d1_c6-e1_e3-f1WURCSPDB2Glycan 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]{[(3+1)][a-D-Manp]{}}}}}}LINUCSPDB-CARE
#8: 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.: 1
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
#10: 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: isolated from a genetically manipulated source
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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Non-polymers , 2 types, 2 molecules

#9: Chemical ChemComp-D10 / DECANE


Mass: 142.282 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H22
#11: 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.: 1 / Source method: obtained synthetically / Formula: C25H49O19P3 / Feature type: SUBJECT OF INVESTIGATION

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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: Cryo-EM structure of the full-length alpha1beta3gamma2 GABA(A) receptor in SMALPs bound to one PIP2 molecule at chain alpha1-D and in complex with Mb38
Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Molecular weightValue: 0.25 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4 / Details: 137 mM NaCl, 2.7 mM KCl, 4.3 mM Na2HPO
Buffer component
IDConc.NameFormulaBuffer-ID
1137 mMsodium chlorideNaCl1
22.7 mMpotassium chlorideKCl1
34.3 mMDisodium phosphateNa2HPO1
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: Current: 30mA / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: HOMEMADE PLUNGER / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 281 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 magnification: 75000 X / Calibrated magnification: 75000 X / Nominal defocus max: 2400 nm / Nominal defocus min: 1400 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 8.64 sec. / Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 11994
Image scansWidth: 4096 / Height: 4096

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Processing

EM software
IDNameVersionCategory
1Warpparticle selection
2EPUimage acquisition
4CTFFIND4.1CTF correction
7PHENIXmodel fitting
9PHENIX1.21_5207model refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 800340
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 69000 / Symmetry type: POINT
Atomic model buildingB value: 30 / Protocol: OTHER / Space: REAL / Target criteria: FSC at 0.5
Atomic model buildingPDB-ID: 6HUK

6huk


Accession code: 6HUK / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00315412
ELECTRON MICROSCOPYf_angle_d0.5120949
ELECTRON MICROSCOPYf_dihedral_angle_d8.865648
ELECTRON MICROSCOPYf_chiral_restr0.0422456
ELECTRON MICROSCOPYf_plane_restr0.0052557

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