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- EMDB-50380: Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in co... -

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Basic information

Entry
Database: EMDB / ID: EMD-50380
TitleCryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state
Map dataUnsharpened map
Sample
  • Complex: Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-1
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-3
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit gamma-2
    • Protein or peptide: Nanobody38
  • Ligand: GAMMA-AMINO-BUTANOIC ACID
KeywordsGABA / neurotransmission / gating cycle / time-resolved cryo-EM / MEMBRANE PROTEIN
Function / homology
Function and homology information


benzodiazepine receptor 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 ...benzodiazepine receptor 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 / chloride channel activity / exploration behavior / adult behavior / motor behavior / roof of mouth development / Signaling by ERBB4 / cochlea development / social behavior / chloride channel complex / dendrite membrane / cytoplasmic vesicle membrane / chloride transmembrane transport / cerebellum development / post-embryonic 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 / axon / cell surface / signal transduction / identical protein binding / plasma membrane
Similarity search - Function
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. ...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-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)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsMihaylov DB / Malinauskas T / Aricescu AR
Funding support United Kingdom, United States, 6 items
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 alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state
Authors: Mihaylov DB / Malinauskas T / Aricescu AR
History
DepositionMay 23, 2024-
Header (metadata) releaseJun 11, 2025-
Map releaseJun 11, 2025-
UpdateJun 11, 2025-
Current statusJun 11, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_50380.png

Downloads & links

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Map

FileDownload / File: emd_50380.map.gz / Format: CCP4 / Size: 35.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationUnsharpened map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.24 Å/pix.
x 210 pix.
= 260.383 Å		1.24 Å/pix.
x 210 pix.
= 260.383 Å		1.24 Å/pix.
x 210 pix.
= 260.383 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.23992 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-0.36777246 - 1.6701254
Average (Standard dev.)0.0117731895 (±0.08177746)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions210210210
Spacing210210210
CellA=B=C: 260.3832 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_50380_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Sharpened map

Fileemd_50380_additional_1.map
AnnotationSharpened map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: One of the half maps

Fileemd_50380_half_map_1.map
AnnotationOne of the half maps
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: One of the half maps

Fileemd_50380_half_map_2.map
AnnotationOne of the half maps
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in co...

EntireName: Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state
Components
  • Complex: Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-1
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-3
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit gamma-2
    • Protein or peptide: Nanobody38
  • Ligand: GAMMA-AMINO-BUTANOIC ACID

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Supramolecule #1: Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in co...

SupramoleculeName: Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 250 KDa

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Macromolecule #1: Gamma-aminobutyric acid receptor subunit alpha-1

MacromoleculeName: Gamma-aminobutyric acid receptor subunit alpha-1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.791688 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: DNTTVFTRIL DRLLDGYDNR LRPGLGERVT EVKTDIFVTS FGPVSDHDME YTIDVFFRQS WKDERLKFKG PMTVLRLNNL MASKIWTPD TFFHNGKKSV AHNMTMPNKL LRITEDGTLL YTMRLTVRAE CPMHLEDFPM DAHACPLKFG SYAYTRAEVV Y EWTREPAR ...String:
DNTTVFTRIL DRLLDGYDNR LRPGLGERVT EVKTDIFVTS FGPVSDHDME YTIDVFFRQS WKDERLKFKG PMTVLRLNNL MASKIWTPD TFFHNGKKSV AHNMTMPNKL LRITEDGTLL YTMRLTVRAE CPMHLEDFPM DAHACPLKFG SYAYTRAEVV Y EWTREPAR SVVVAEDGSR LNQYDLLGQT VDSGIVQSST GEYVVMTTHF HLKRKIGYFV IQTYLPCIMT VILSQVSFWL NR ESVPART VFGVTTVLTM TTLSISARNS LPKVAYATAM DWFIAVCYAF VFSALIEFAT VNYFTKSQPA RAAKIDRLSR IAF PLLFGI FNLVYWATYL NR

UniProtKB: Gamma-aminobutyric acid receptor subunit alpha-1, Gamma-aminobutyric acid receptor subunit alpha-1

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Macromolecule #2: Gamma-aminobutyric acid receptor subunit beta-3

MacromoleculeName: Gamma-aminobutyric acid receptor subunit beta-3 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.719836 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: NMSFVKETVD KLLKGYDIRL RPDFGGPPVC VGMNIDIASI DMVSEVNMDY TLTMYFQQYW RDKRLAYSGI PLNLTLDNRV ADQLWVPDT YFLNDKKSFV HGVTVKNRMI RLHPDGTVLY GLRITTTAAC MMDLRRYPLD EQNCTLEIES YGYTTDDIEF Y WRGGDKAV ...String:
NMSFVKETVD KLLKGYDIRL RPDFGGPPVC VGMNIDIASI DMVSEVNMDY TLTMYFQQYW RDKRLAYSGI PLNLTLDNRV ADQLWVPDT YFLNDKKSFV HGVTVKNRMI RLHPDGTVLY GLRITTTAAC MMDLRRYPLD EQNCTLEIES YGYTTDDIEF Y WRGGDKAV TGVERIELPQ FSIVEHRLVS RNVVFATGAY PRLSLSFRLK RNIGYFILQT YMPSILITIL SWVSFWINYD AS AARVALG ITTVLTMTTI NTHLRETLPK IPYVKAIDMY LMGCFVFVFL ALLEYAFVNY IFFSQPARAA AIDRWSRIVF PFT FSLFNL VYWLYYV

UniProtKB: Gamma-aminobutyric acid receptor subunit beta-3, Gamma-aminobutyric acid receptor subunit beta-3

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Macromolecule #3: Gamma-aminobutyric acid receptor subunit gamma-2

MacromoleculeName: Gamma-aminobutyric acid receptor subunit gamma-2 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.753637 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: GDVTVILNNL LEGYDNKLRP DIGVKPTLIH TDMYVNSIGP VNAINMEYTI DIFFAQTWYD RRLKFNSTIK VLRLNSNMVG KIWIPDTFF RNSKKADAHW ITTPNRMLRI WNDGRVLYTL RLTIDAECQL QLHNFPMDEH SCPLEFSSYG YPREEIVYQW K RSSVEVGD ...String:
GDVTVILNNL LEGYDNKLRP DIGVKPTLIH TDMYVNSIGP VNAINMEYTI DIFFAQTWYD RRLKFNSTIK VLRLNSNMVG KIWIPDTFF RNSKKADAHW ITTPNRMLRI WNDGRVLYTL RLTIDAECQL QLHNFPMDEH SCPLEFSSYG YPREEIVYQW K RSSVEVGD TRSWRLYQFS FVGLRNTTEV VKTTSGDYVV MSVYFDLSRR MGYFTIQTYI PCTLIVVLSW VSFWINKDAV PA RTSLGIT TVLTMTTLST IARKSLPKVS YVTAMDLFVS VCFIFVFSAL VEYGTLHYFV SSQPARAAKM DSYARIFFPT AFC LFNLVY WVSYLYLG

UniProtKB: Gamma-aminobutyric acid receptor subunit gamma-2, Gamma-aminobutyric acid receptor subunit gamma-2

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Macromolecule #4: Nanobody38

MacromoleculeName: Nanobody38 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Lama glama (llama)
Molecular weightTheoretical: 13.492936 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
QVQLQESGGG LVQAGGSLRV SCAASGRTFT TYIMAWFRQA PGKEREFLAA MDQGRIQYYG DSVRGRFTIS RDYAKNSVDL QLDGLRPED TAVYYCAAGA GFWGLRTASS YHYWGQGTQV TVSS

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Macromolecule #9: GAMMA-AMINO-BUTANOIC ACID

MacromoleculeName: GAMMA-AMINO-BUTANOIC ACID / type: ligand / ID: 9 / Number of copies: 2 / Formula: ABU
Molecular weightTheoretical: 103.12 Da
Chemical component information

ChemComp-ABU:
GAMMA-AMINO-BUTANOIC ACID

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration1 mg/mL
BufferpH: 7.4
Component:
ConcentrationFormulaName
137.0 mMNaClsodium chloride
2.7 mMKClpotassium chloride
4.3 mMNa2HPODisodium phosphate

Details: 137 mM NaCl, 2.7 mM KCl, 4.3 mM Na2HPO
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.039 kPa / Details: current: 30mA
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 281 K / Instrument: HOMEMADE PLUNGER

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 20929 / Average exposure time: 4.34 sec. / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Calibrated magnification: 96000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.4000000000000001 µm / Nominal magnification: 96000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 11688944
CTF correctionSoftware - Name: CTFFIND (ver. 4.1) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER / Details: Ab-initio
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 28000
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final 3D classificationSoftware - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6huk


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: OTHER / Overall B value: 30 / Target criteria: FSC at 0.5
Output model

PDB-9fg0:
Cryo-EM structure of the alpha1beta3gamma2 GABA(A) receptor in complex with GABA and Nb38 in the short-lived asymmetric open 2 state

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