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- EMDB-22034: Human GABAA receptor alpha1-beta2-gamma2 subtype in complex with ... -

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Entry
Database: EMDB / ID: EMD-22034
TitleHuman GABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus etomidate
Map dataGABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus etomidate
Sample
  • Complex: Human GABA-A receptor alpha1-beta2-gamma2 subtype in complex with GABA and etomidate
    • Complex: Human GABA-A receptor alpha1-beta2-gamma2 subtype
      • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-2
      • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-1
      • Protein or peptide: Gamma-aminobutyric acid receptor subunit gamma-2
    • Protein or peptide: Kappa Fab Light Chain
    • Protein or peptide: IgG2b Fab Heavy Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: GAMMA-AMINO-BUTANOIC ACID
  • Ligand: Etomidate
KeywordsIon channel / Cys-loop receptor / pentametic ligand gated channel / GABAA receptor / MEMBRANE PROTEIN
Function / homology
Function and homology information


benzodiazepine receptor activity / GABA receptor complex / inner ear receptor cell development / cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / innervation ...benzodiazepine receptor activity / GABA receptor complex / inner ear receptor cell development / cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / innervation / synaptic transmission, GABAergic / gamma-aminobutyric acid signaling pathway / postsynaptic specialization membrane / neurotransmitter receptor activity / chloride channel activity / cochlea development / adult behavior / Signaling by ERBB4 / chloride channel complex / regulation of postsynaptic membrane potential / transmembrane transporter complex / GABA-ergic synapse / chloride transmembrane transport / dendrite membrane / post-embryonic development / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / cytoplasmic vesicle membrane / chemical synaptic transmission / postsynaptic membrane / postsynapse / dendritic spine / neuron projection / axon / synapse / extracellular exosome / 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, beta subunit / Gamma-aminobutyric-acid A receptor, alpha 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, beta subunit / Gamma-aminobutyric-acid A receptor, alpha 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-2
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsKim JJ / Gharpure A
Funding support United States, 5 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)DA037492 United States
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)DA042072 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS095899 United States
Welch FoundationI-1812 United States
American Heart Association20POST35200127 United States
CitationJournal: Nature / Year: 2020
Title: Shared structural mechanisms of general anaesthetics and benzodiazepines.
Authors: Jeong Joo Kim / Anant Gharpure / Jinfeng Teng / Yuxuan Zhuang / Rebecca J Howard / Shaotong Zhu / Colleen M Noviello / Richard M Walsh / Erik Lindahl / Ryan E Hibbs /
Abstract: Most general anaesthetics and classical benzodiazepine drugs act through positive modulation of γ-aminobutyric acid type A (GABA) receptors to dampen neuronal activity in the brain. However, direct ...Most general anaesthetics and classical benzodiazepine drugs act through positive modulation of γ-aminobutyric acid type A (GABA) receptors to dampen neuronal activity in the brain. However, direct structural information on the mechanisms of general anaesthetics at their physiological receptor sites is lacking. Here we present cryo-electron microscopy structures of GABA receptors bound to intravenous anaesthetics, benzodiazepines and inhibitory modulators. These structures were solved in a lipidic environment and are complemented by electrophysiology and molecular dynamics simulations. Structures of GABA receptors in complex with the anaesthetics phenobarbital, etomidate and propofol reveal both distinct and common transmembrane binding sites, which are shared in part by the benzodiazepine drug diazepam. Structures in which GABA receptors are bound by benzodiazepine-site ligands identify an additional membrane binding site for diazepam and suggest an allosteric mechanism for anaesthetic reversal by flumazenil. This study provides a foundation for understanding how pharmacologically diverse and clinically essential drugs act through overlapping and distinct mechanisms to potentiate inhibitory signalling in the brain.
History
DepositionMay 21, 2020-
Header (metadata) releaseSep 9, 2020-
Map releaseSep 9, 2020-
UpdateNov 13, 2024-
Current statusNov 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6x3v
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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Structure viewerEM map:
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Supplemental images

emd_22034.png

Downloads & links

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Map

FileDownload / File: emd_22034.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationGABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus etomidate
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 288 pix.
= 239.904 Å		0.83 Å/pix.
x 288 pix.
= 239.904 Å		0.83 Å/pix.
x 288 pix.
= 239.904 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.833 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0189 / Movie #1: 0.015
Minimum - Maximum-0.08026132 - 0.12811872
Average (Standard dev.)0.00029351827 (±0.003630041)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 239.904 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8330.8330.833
M x/y/z288288288
origin x/y/z0.0000.0000.000
length x/y/z239.904239.904239.904
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ500500500
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS288288288
D min/max/mean-0.0800.1280.000

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Supplemental data

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Half map: half-volume 1

Fileemd_22034_half_map_1.map
Annotationhalf-volume 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half-volume 2

Fileemd_22034_half_map_2.map
Annotationhalf-volume 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Human GABA-A receptor alpha1-beta2-gamma2 subtype in complex with...

EntireName: Human GABA-A receptor alpha1-beta2-gamma2 subtype in complex with GABA and etomidate
Components
  • Complex: Human GABA-A receptor alpha1-beta2-gamma2 subtype in complex with GABA and etomidate
    • Complex: Human GABA-A receptor alpha1-beta2-gamma2 subtype
      • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-2
      • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-1
      • Protein or peptide: Gamma-aminobutyric acid receptor subunit gamma-2
    • Protein or peptide: Kappa Fab Light Chain
    • Protein or peptide: IgG2b Fab Heavy Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: GAMMA-AMINO-BUTANOIC ACID
  • Ligand: Etomidate

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Supramolecule #1: Human GABA-A receptor alpha1-beta2-gamma2 subtype in complex with...

SupramoleculeName: Human GABA-A receptor alpha1-beta2-gamma2 subtype in complex with GABA and etomidate
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Details: Fab fragments generated by proteolytic cleavage of IgG antibody
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #2: Human GABA-A receptor alpha1-beta2-gamma2 subtype

SupramoleculeName: Human GABA-A receptor alpha1-beta2-gamma2 subtype / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#3
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Gamma-aminobutyric acid receptor subunit beta-2

MacromoleculeName: Gamma-aminobutyric acid receptor subunit beta-2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 41.810086 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: QSVNDPSNMS LVKETVDRLL KGYDIRLRPD FGGPPVAVGM NIDIASIDMV SEVNMDYTLT MYFQQAWRDK RLSYNVIPLN LTLDNRVAD QLWVPDTYFL NDKKSFVHGV TVKNRMIRLH PDGTVLYGLR ITTTAACMMD LRRYPLDEQN CTLEIESYGY T TDDIEFYW ...String:
QSVNDPSNMS LVKETVDRLL KGYDIRLRPD FGGPPVAVGM NIDIASIDMV SEVNMDYTLT MYFQQAWRDK RLSYNVIPLN LTLDNRVAD QLWVPDTYFL NDKKSFVHGV TVKNRMIRLH PDGTVLYGLR ITTTAACMMD LRRYPLDEQN CTLEIESYGY T TDDIEFYW RGDDNAVTGV TKIELPQFSI VDYKLITKKV VFSTGSYPRL SLSFKLKRNI GYFILQTYMP SILITILSWV SF WINYDAS AARVALGITT VLTMTTINTH LRETLPKIPY VKAIDMYLMG CFVFVFMALL EYALVNYIFF SQPARAAAID RWS RIFFPV VFSFFNIVYW LYYVNVDGSG ATNFSLLKQA GDVEENPG

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

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Macromolecule #2: Gamma-aminobutyric acid receptor subunit alpha-1

MacromoleculeName: Gamma-aminobutyric acid receptor subunit alpha-1 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 41.061211 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: QPSLQDELKD NTTVFTRILD RLLDGYDNRL RPGLGERVTE VKTDIFVTSF GPVSDHDMEY TIDVFFRQSW KDERLKFKGP MTVLRLNNL MASKIWTPDT FFHNGKKSVA HNMTMPNKLL RITEDGTLLY TMRLTVRAEC PMHLEDFPMD AHACPLKFGS Y AYTRAEVV ...String:
QPSLQDELKD NTTVFTRILD RLLDGYDNRL RPGLGERVTE VKTDIFVTSF GPVSDHDMEY TIDVFFRQSW KDERLKFKGP MTVLRLNNL MASKIWTPDT FFHNGKKSVA HNMTMPNKLL RITEDGTLLY TMRLTVRAEC PMHLEDFPMD AHACPLKFGS Y AYTRAEVV YEWTREPARS VVVAEDGSRL NQYDLLGQTV DSGIVQSSTG EYVVMTTHFH LKRKIGYFVI QTYLPCIMTV IL SQVSFWL NRESVPARTV FGVTTVLTMT TLSISARNSL PKVAYATAMD WFIAVCYAFV FSALIEFATV NYFTKSQPAR AAK IDRLSR IAFPLLFGIF NLVYWATYLN REPQLKAPTP HQ

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

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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: 47.673109 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: WSHPQFEKGG GSGGGSGGSS AWSHPQFEKL EVLFQGPQKS DDDYEDYASN KTWVLTPKVP EGDVTVILNN LLEGYDNKLR PDIGVKPTL IHTDMYVNSI GPVNAINMEY TIDIFFAQTW YDRRLKFNST IKVLRLNSNM VGKIWIPDTF FRNSKKADAH W ITTPNRML ...String:
WSHPQFEKGG GSGGGSGGSS AWSHPQFEKL EVLFQGPQKS DDDYEDYASN KTWVLTPKVP EGDVTVILNN LLEGYDNKLR PDIGVKPTL IHTDMYVNSI GPVNAINMEY TIDIFFAQTW YDRRLKFNST IKVLRLNSNM VGKIWIPDTF FRNSKKADAH W ITTPNRML RIWNDGRVLY TLRLTIDAEC QLQLHNFPMD EHSCPLEFSS YGYPREEIVY QWKRSSVEVG DTRSWRLYQF SF VGLRNTT EVVKTTSGDY VVMSVYFDLS RRMGYFTIQT YIPCTLIVVL SWVSFWINKD AVPARTSLGI TTVLTMTTLS TIA RKSLPK VSYVTAMDLF VSVCFIFVFS ALVEYGTLHY FVSSQPARAA KMDSYARIFF PTAFCLFNLV YWVSYLYLSR GSGA TNFSL LKQAGDVEEN PG

UniProtKB: Gamma-aminobutyric acid receptor subunit gamma-2

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Macromolecule #4: Kappa Fab Light Chain

MacromoleculeName: Kappa Fab Light Chain / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.505943 KDa
SequenceString: NIVMTQSPKS MSMSVGERVT LSCKASEYVG TYVSWYQQKP EQSPKLLIYG ASNRYTGVPD RFTGSGSATD FTLTIGSVQA EDLADYHCG QSYSYPTFGA GTKLELKRAD AAPTVSIFPP SSEQLTSGGA SVVCFLNNFY PKDINVKWKI DGSERQNGVL N SWTDQDSK ...String:
NIVMTQSPKS MSMSVGERVT LSCKASEYVG TYVSWYQQKP EQSPKLLIYG ASNRYTGVPD RFTGSGSATD FTLTIGSVQA EDLADYHCG QSYSYPTFGA GTKLELKRAD AAPTVSIFPP SSEQLTSGGA SVVCFLNNFY PKDINVKWKI DGSERQNGVL N SWTDQDSK DSTYSMSSTL TLTKDEYERH NSYTCEATHK TSTSPIVKSF NRNEC

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Macromolecule #5: IgG2b Fab Heavy Chain

MacromoleculeName: IgG2b Fab Heavy Chain / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 49.811043 KDa
SequenceString: EVQLQQSGAE LVKPGASVKL SCTASGFNIK DTYMYWVKQR PEQGLEWIGR IDPANGDTKY DPKFQGKATI TTDTFSNTAY LQLSSLTSE DTAVYYCARK GLRWAMDYWG QGTSVTVSTA KTTPPSVYPL APGCGDTTGS SVTLGCLVKG YFPESVTVTW N SGSLSSSV ...String:
EVQLQQSGAE LVKPGASVKL SCTASGFNIK DTYMYWVKQR PEQGLEWIGR IDPANGDTKY DPKFQGKATI TTDTFSNTAY LQLSSLTSE DTAVYYCARK GLRWAMDYWG QGTSVTVSTA KTTPPSVYPL APGCGDTTGS SVTLGCLVKG YFPESVTVTW N SGSLSSSV HTFPALLQSG LYTMSSSVTV PSSTWPSQTV TCSVAHPASS TTVDKKLEPS GPISTINPCP PCKECHKCPA PN LEGGPSV FIFPPNIKDV LMISLTPKVT CVVVDVSEDD PDVQISWFVN NVEVHTAQTQ THREDYNSTI RVVSTLPIQH QDW MSGKEF KCKVNNKDLP SPIERTISKI KGLVRAPQVY ILPPPAEQLS RKDVSLTCLV VGFNPGDISV EWTSNGHTEE NYKD TAPVL DSDGSYFIYS KLNMKTSKWE KTDSFSCNVR HEGLKNYYLK KTISRSPGK

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Macromolecule #9: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 9 / Number of copies: 2 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #10: GAMMA-AMINO-BUTANOIC ACID

MacromoleculeName: GAMMA-AMINO-BUTANOIC ACID / type: ligand / ID: 10 / Number of copies: 2 / Formula: ABU
Molecular weightTheoretical: 103.12 Da
Chemical component information

ChemComp-ABU:
GAMMA-AMINO-BUTANOIC ACID

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Macromolecule #11: Etomidate

MacromoleculeName: Etomidate / type: ligand / ID: 11 / Number of copies: 2 / Formula: V8D
Molecular weightTheoretical: 244.289 Da
Chemical component information

ChemComp-V8D:
Etomidate

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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

Concentration8.5 mg/mL
BufferpH: 7.4
Component:
ConcentrationFormulaName
20.0 mMC4H11NO3Tris
150.0 mMNaClSodium chloride
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 80 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: 3.5 second blot.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number real images: 9013 / Average electron dose: 66.07 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
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: 1972936
Startup modelType of model: OTHER / Details: De novo initial model from Relion
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 124310
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final 3D classificationSoftware - Name: RELION

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-6x3v:
Human GABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus etomidate

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