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- PDB-7qnb: Cryo-EM structure of human full-length beta3gamma2 GABA(A)R in co... -
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Basic information
Entry | Database: PDB / ID: 7qnb | ||||||||||||||||||
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Title | Cryo-EM structure of human full-length beta3gamma2 GABA(A)R in complex with GABA and nanobody Nb25 | ||||||||||||||||||
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![]() | MEMBRANE PROTEIN / pentameric ligand-gated ion channel / neurotransmitter receptor / GABA receptor | ||||||||||||||||||
Function / homology | ![]() cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / Signaling by ERBB4 / synaptic transmission, GABAergic / gamma-aminobutyric acid signaling pathway / chloride transport ...cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / Signaling by ERBB4 / synaptic transmission, GABAergic / gamma-aminobutyric acid signaling pathway / chloride transport / postsynaptic specialization membrane / neurotransmitter receptor activity / chloride channel activity / roof of mouth development / chloride channel complex / transmembrane transporter complex / extracellular ligand-gated monoatomic ion channel activity / chloride transmembrane transport / cytoplasmic vesicle membrane / postsynaptic membrane / neuron projection / synapse / signal transduction / identical protein binding / plasma membrane Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å | ||||||||||||||||||
![]() | Sente, A. / Desai, R. / Naydenova, K. / Malinauskas, T. / Jounaidi, Y. / Miehling, J. / Zhou, X. / Masiulis, S. / Hardwick, S.W. / Chirgadze, D.Y. ...Sente, A. / Desai, R. / Naydenova, K. / Malinauskas, T. / Jounaidi, Y. / Miehling, J. / Zhou, X. / Masiulis, S. / Hardwick, S.W. / Chirgadze, D.Y. / Miller, K.W. / Aricescu, A.R. | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Differential assembly diversifies GABA receptor structures and signalling. Authors: Andrija Sente / Rooma Desai / Katerina Naydenova / Tomas Malinauskas / Youssef Jounaidi / Jonas Miehling / Xiaojuan Zhou / Simonas Masiulis / Steven W Hardwick / Dimitri Y Chirgadze / Keith ...Authors: Andrija Sente / Rooma Desai / Katerina Naydenova / Tomas Malinauskas / Youssef Jounaidi / Jonas Miehling / Xiaojuan Zhou / Simonas Masiulis / Steven W Hardwick / Dimitri Y Chirgadze / Keith W Miller / A Radu Aricescu / ![]() ![]() ![]() Abstract: Type A γ-aminobutyric acid receptors (GABARs) are pentameric ligand-gated chloride channels that mediate fast inhibitory signalling in neural circuits and can be modulated by essential medicines ...Type A γ-aminobutyric acid receptors (GABARs) are pentameric ligand-gated chloride channels that mediate fast inhibitory signalling in neural circuits and can be modulated by essential medicines including general anaesthetics and benzodiazepines. Human GABAR subunits are encoded by 19 paralogous genes that can, in theory, give rise to 495,235 receptor types. However, the principles that govern the formation of pentamers, the permutational landscape of receptors that may emerge from a subunit set and the effect that this has on GABAergic signalling remain largely unknown. Here we use cryogenic electron microscopy to determine the structures of extrasynaptic GABARs assembled from α4, β3 and δ subunits, and their counterparts incorporating γ2 instead of δ subunits. In each case, we identified two receptor subtypes with distinct stoichiometries and arrangements, all four differing from those previously observed for synaptic, α1-containing receptors. This, in turn, affects receptor responses to physiological and synthetic modulators by creating or eliminating ligand-binding sites at subunit interfaces. We provide structural and functional evidence that selected GABAR arrangements can act as coincidence detectors, simultaneously responding to two neurotransmitters: GABA and histamine. Using assembly simulations and single-cell RNA sequencing data, we calculated the upper bounds for receptor diversity in recombinant systems and in vivo. We propose that differential assembly is a pervasive mechanism for regulating the physiology and pharmacology of GABARs. | ||||||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 347.5 KB | Display | ![]() |
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PDB format | ![]() | 273 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 14073MC ![]() 7qn5C ![]() 7qn6C ![]() 7qn7C ![]() 7qn8C ![]() 7qn9C ![]() 7qnaC ![]() 7qncC ![]() 7qndC ![]() 7qneC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
EM raw data | ![]() Data size: 3.8 TB Data #1: Unaligned multi-frame micrographs of GABA(A) receptors purified from cells expressing alpha4, beta3 and gamma2 subunits [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Gamma-aminobutyric acid ... , 2 types, 5 molecules ACBDE
#1: Protein | Mass: 55666.809 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Protein | Mass: 54180.348 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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-Antibody / Non-polymers , 2 types, 2 molecules N![](data/chem/img/ABU.gif)
![](data/chem/img/ABU.gif)
#3: Antibody | Mass: 13341.741 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
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#7: Chemical | ChemComp-ABU / |
-Sugars , 3 types, 8 molecules ![](data/chem/img/NAG.gif)
#4: Polysaccharide | Source method: isolated from a genetically manipulated source #5: Polysaccharide | Source method: isolated from a genetically manipulated source #6: Sugar | |
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-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Human full-length beta3gamma2 GABA(A)R in complex with GABA and Nanobody Nb25 Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT | |||||||||||||||
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Source (natural) | Organism: ![]() | |||||||||||||||
Source (recombinant) | Organism: ![]() | |||||||||||||||
Buffer solution | pH: 7.6 | |||||||||||||||
Buffer component |
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Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||
Vitrification | 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 |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: 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 holder | Cryogen: NITROGEN |
Image recording | Electron dose: 47.46 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
EM imaging optics | Energyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 65867 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: AB INITIO MODEL | ||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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