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- PDB-8trc: mGluR3 in the presence of the antagonist LY 341495 and positive a... -

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Basic information

Entry
Database: PDB / ID: 8trc
TitlemGluR3 in the presence of the antagonist LY 341495 and positive allosteric modulator VU6023326
ComponentsMetabotropic glutamate receptor 3
KeywordsMEMBRANE PROTEIN / GPCR / synaptic protein
Function / homology
Function and homology information


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 / dendritic spine / postsynaptic density / neuron projection / axon / glutamatergic synapse / plasma membrane
Similarity search - Function
GPCR, family 3, metabotropic glutamate receptor 3 / GPCR, family 3, metabotropic glutamate receptor / : / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / G-protein coupled receptors family 3 signature 3. ...GPCR, family 3, metabotropic glutamate receptor 3 / GPCR, family 3, metabotropic glutamate receptor / : / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / G-protein coupled receptors family 3 signature 3. / GPCR, family 3 / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I
Similarity search - Domain/homology
Chem-Z99 / Metabotropic glutamate receptor 3
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsStrauss, A. / Levitz, J.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)1F31NS129320 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)F32GM148001 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01NS129904 United States
CitationJournal: bioRxiv / Year: 2023
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
DepositionAug 9, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 31, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 16, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Metabotropic glutamate receptor 3
B: Metabotropic glutamate receptor 3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)207,0304
Polymers206,3232
Non-polymers7072
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Metabotropic glutamate receptor 3


Mass: 103161.555 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Grm3 / Production host: Homo sapiens (human) / References: UniProt: P31422
#2: Chemical ChemComp-Z99 / 2-[(1S,2S)-2-carboxycyclopropyl]-3-(9H-xanthen-9-yl)-D-alanine / (1S,2S)-2-[(2S)-2-amino-1-hydroxy-1-oxo-3-(9H-xanthen-9-yl)propan-2-yl]cyclopropane-1-carboxylic acid


Mass: 353.369 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C20H19NO5 / Feature type: SUBJECT OF INVESTIGATION / Comment: antidepressant, antagonist*YM
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Metabotropic Glutamate Receptor 3 dimer / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.26 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solution
IDSpecimen-IDpH
117.5
217.5
327.5
427.5
Specimen
IDConc. (mg/ml)Experiment-IDEmbedding appliedShadowing appliedStaining appliedVitrification applied
14.51NONONOYES
21NONONOYES
Specimen support
IDSpecimen-IDGrid materialGrid mesh size (divisions/in.)Grid type
11GOLD300UltrAuFoil R1.2/1.3
22UltrAuFoil R1.2/1.3
Vitrification
IDInstrumentCryogen nameSpecimen-IDEntry-ID
1FEI VITROBOT MARK IVETHANE18TRC
2FEI VITROBOT MARK IVETHANE28TRC

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 700 nm / Alignment procedure: BASIC
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 58 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 116376 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL

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