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- PDB-8oq7: CryoEM structure of human rho1 GABAA receptor in complex with inh... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8oq7 | ||||||
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Title | CryoEM structure of human rho1 GABAA receptor in complex with inhibitor TPMPA | ||||||
![]() | Gamma-aminobutyric acid receptor subunit rho-1 | ||||||
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Function / homology | ![]() GABA receptor activation / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Chen, F. / Victor, T. / John, C. / Rebecca, J.H. / Lindahl, E. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structure and dynamics of differential ligand binding in the human ρ-type GABA receptor. Authors: John Cowgill / Chen Fan / Nandan Haloi / Victor Tobiasson / Yuxuan Zhuang / Rebecca J Howard / Erik Lindahl / ![]() Abstract: The neurotransmitter γ-aminobutyric acid (GABA) drives critical inhibitory processes in and beyond the nervous system, partly via ionotropic type-A receptors (GABARs). Pharmacological properties of ...The neurotransmitter γ-aminobutyric acid (GABA) drives critical inhibitory processes in and beyond the nervous system, partly via ionotropic type-A receptors (GABARs). Pharmacological properties of ρ-type GABARs are particularly distinctive, yet the structural basis for their specialization remains unclear. Here, we present cryo-EM structures of a lipid-embedded human ρ1 GABAR, including a partial intracellular domain, under apo, inhibited, and desensitized conditions. An apparent resting state, determined first in the absence of modulators, was recapitulated with the specific inhibitor (1,2,5,6-tetrahydropyridin-4-yl)methylphosphinic acid and blocker picrotoxin and provided a rationale for bicuculline insensitivity. Comparative structures, mutant recordings, and molecular simulations with and without GABA further explained the sensitized but slower activation of ρ1 relative to canonical subtypes. Combining GABA with picrotoxin also captured an apparent uncoupled intermediate state. This work reveals structural mechanisms of gating and modulation with applications to ρ-specific pharmaceutical design and to our biophysical understanding of ligand-gated ion channels. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 333.9 KB | Display | ![]() |
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PDB format | ![]() | 270.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 17107MC ![]() 8op9C ![]() 8oq6C ![]() 8oq8C ![]() 8oqaC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein / Sugars , 2 types, 15 molecules ABCDE![](data/chem/img/NAG.gif)
![](data/chem/img/NAG.gif)
#1: Protein | Mass: 55950.230 Da / Num. of mol.: 5 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #3: Sugar | ChemComp-NAG / ![]() |
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-Non-polymers , 7 types, 552 molecules ![](data/chem/img/VZA.gif)
![](data/chem/img/HEX.gif)
![](data/chem/img/OCT.gif)
![](data/chem/img/D12.gif)
![](data/chem/img/D10.gif)
![](data/chem/img/CL.gif)
![](data/chem/img/HOH.gif)
![](data/chem/img/HEX.gif)
![](data/chem/img/OCT.gif)
![](data/chem/img/D12.gif)
![](data/chem/img/D10.gif)
![](data/chem/img/CL.gif)
![](data/chem/img/HOH.gif)
#2: Chemical | ChemComp-VZA / #4: Chemical | ChemComp-HEX / ![]() #5: Chemical | ChemComp-OCT / ![]() #6: Chemical | ChemComp-D12 / ![]() #7: Chemical | ChemComp-D10 / ![]() #8: Chemical | ![]() #9: Water | ChemComp-HOH / | ![]() |
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-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
Component | Name: human rho1 GABAA receptor / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() |
Vitrification![]() | Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 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![]() |
Image recording | Electron dose: 46.12 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||
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EM software | Name: EPU / Category: image acquisition | ||||||||||||||||||||||||
CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 2.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 162880 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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