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Open data
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Basic information
Entry | Database: PDB / ID: 8tr2 | ||||||||||||
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Title | mGluR3 in the presence of the agonist LY379268 | ||||||||||||
![]() | Metabotropic glutamate receptor 3 | ||||||||||||
![]() | MEMBRANE PROTEIN / GPCR / synaptic protein | ||||||||||||
Function / homology | ![]() Class C/3 (Metabotropic glutamate/pheromone receptors) / group II metabotropic glutamate receptor activity / G protein-coupled glutamate receptor signaling pathway / astrocyte projection / G alpha (i) signalling events / postsynaptic modulation of chemical synaptic transmission / calcium channel regulator activity / regulation of synaptic transmission, glutamatergic / sensory perception of pain / modulation of chemical synaptic transmission ...Class C/3 (Metabotropic glutamate/pheromone receptors) / group II metabotropic glutamate receptor activity / G protein-coupled glutamate receptor signaling pathway / astrocyte projection / G alpha (i) signalling events / postsynaptic modulation of chemical synaptic transmission / calcium channel regulator activity / regulation of synaptic transmission, glutamatergic / sensory perception of pain / modulation of chemical synaptic transmission / presynaptic membrane / gene expression / scaffold protein binding / postsynaptic membrane / postsynapse / dendritic spine / postsynaptic density / neuron projection / axon / glutamatergic synapse / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||||||||
![]() | Strauss, A. / Levitz, J. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis of allosteric modulation of metabotropic glutamate receptor activation and desensitization. Abstract: The metabotropic glutamate receptors (mGluRs) are neuromodulatory family C G protein coupled receptors which assemble as dimers and allosterically couple extracellular ligand binding domains (LBDs) ...The metabotropic glutamate receptors (mGluRs) are neuromodulatory family C G protein coupled receptors which assemble as dimers and allosterically couple extracellular ligand binding domains (LBDs) to transmembrane domains (TMDs) to drive intracellular signaling. Pharmacologically, mGluRs can be targeted either at the LBDs by glutamate and synthetic orthosteric compounds or at the TMDs by allosteric modulators. Despite the potential of allosteric TMD-targeting compounds as therapeutics, an understanding of the functional and structural basis of their effects on mGluRs is limited. Here we use a battery of approaches to dissect the distinct functional and structural effects of orthosteric versus allosteric ligands. We find using electrophysiological and live cell imaging assays that both agonists and positive allosteric modulators (PAMs) can drive activation and desensitization of mGluRs. The effects of PAMs are pleiotropic, including both the ability to boost the maximal response to orthosteric agonists and to serve independently as desensitization-biased agonists across mGluR subtypes. Conformational sensors reveal PAM-driven inter-subunit re-arrangements at both the LBD and TMD. Motivated by this, we determine cryo-electron microscopy structures of mGluR3 in the presence of either an agonist or antagonist alone or in combination with a PAM. These structures reveal PAM-driven re-shaping of intra- and inter-subunit conformations and provide evidence for a rolling TMD dimer interface activation pathway that controls G protein and beta-arrestin coupling. HIGHLIGHTS: -Agonists and PAMs drive mGluR activation, desensitization, and endocytosis-PAMs are desensitization-biased and synergistic with agonists-Four combinatorial ligand conditions reveal an ...HIGHLIGHTS: -Agonists and PAMs drive mGluR activation, desensitization, and endocytosis-PAMs are desensitization-biased and synergistic with agonists-Four combinatorial ligand conditions reveal an ensemble of full-length mGluR structures with novel interfaces-Activation and desensitization involve rolling TMD interfaces which are re-shaped by PAM. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 256.7 KB | Display | ![]() |
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PDB format | ![]() | 191.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 41568MC ![]() 8tqbC ![]() 8tr0C ![]() 8trcC 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
#1: Protein | Mass: 103161.555 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Chemical | Mass: 187.150 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C7H9NO5 #3: Chemical | ChemComp-CA / 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: Metabotropic Glutamate Receptor 3 dimer / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT | |||||||||||||||||||||
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Molecular weight | Value: 0.26 MDa / Experimental value: NO | |||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | |||||||||||||||||||||
Source (recombinant) | Organism: ![]() | |||||||||||||||||||||
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Specimen |
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Specimen support | Grid material: GOLD / Grid type: UltrAuFoil R1.2/1.3 | |||||||||||||||||||||
Vitrification |
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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 defocus max: 2000 nm / Nominal defocus min: 700 nm / Alignment procedure: BASIC |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 58 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
EM software | Name: PHENIX / Version: 1.21_5207 / Category: model refinement |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
3D reconstruction | Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 133004 / Symmetry type: POINT |
Atomic model building | Protocol: AB INITIO MODEL / Space: REAL |
Refinement | Cross valid method: NONE |