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- EMDB-36286: The consensus Cryo-EM map of Gi1-bound mGlu2-mGlu4 heterodimer -

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Basic information

Entry
Database: EMDB / ID: EMD-36286
TitleThe consensus Cryo-EM map of Gi1-bound mGlu2-mGlu4 heterodimer
Map data
Sample
  • Complex: Cryo-EM structure of Gi1-bound mGlu2-mGlu4 heterodimer
KeywordsComplex structure / Gi1-bound mGlu2-mGlu4 heterodimer / Membrane protein
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsWang X / Wang M / Xu T / Feng Y / Han S / Lin S / Zhao Q / Wu B
Funding support China, 2 items
OrganizationGrant numberCountry
National Science Foundation (NSF, China)31825010 China
National Science Foundation (NSF, China)82121005 China
CitationJournal: Cell Res / Year: 2023
Title: Structural insights into dimerization and activation of the mGlu2-mGlu3 and mGlu2-mGlu4 heterodimers.
Authors: Xinwei Wang / Mu Wang / Tuo Xu / Ye Feng / Qiang Shao / Shuo Han / Xiaojing Chu / Yechun Xu / Shuling Lin / Qiang Zhao / Beili Wu /
Abstract: Heterodimerization of the metabotropic glutamate receptors (mGlus) has shown importance in the functional modulation of the receptors and offers potential drug targets for treating central nervous ...Heterodimerization of the metabotropic glutamate receptors (mGlus) has shown importance in the functional modulation of the receptors and offers potential drug targets for treating central nervous system diseases. However, due to a lack of molecular details of the mGlu heterodimers, understanding of the mechanisms underlying mGlu heterodimerization and activation is limited. Here we report twelve cryo-electron microscopy (cryo-EM) structures of the mGlu2-mGlu3 and mGlu2-mGlu4 heterodimers in different conformational states, including inactive, intermediate inactive, intermediate active and fully active conformations. These structures provide a full picture of conformational rearrangement of mGlu2-mGlu3 upon activation. The Venus flytrap domains undergo a sequential conformational change, while the transmembrane domains exhibit a substantial rearrangement from an inactive, symmetric dimer with diverse dimerization patterns to an active, asymmetric dimer in a conserved dimerization mode. Combined with functional data, these structures reveal that stability of the inactive conformations of the subunits and the subunit-G protein interaction pattern are determinants of asymmetric signal transduction of the heterodimers. Furthermore, a novel binding site for two mGlu4 positive allosteric modulators was observed in the asymmetric dimer interfaces of the mGlu2-mGlu4 heterodimer and mGlu4 homodimer, and may serve as a drug recognition site. These findings greatly extend our knowledge about signal transduction of the mGlus.
History
DepositionMay 25, 2023-
Header (metadata) releaseJun 21, 2023-
Map releaseJun 21, 2023-
UpdateOct 18, 2023-
Current statusOct 18, 2023Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_36286.png

Downloads & links

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Map

FileDownload / File: emd_36286.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.071 Å
Density
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-2.1248822 - 2.4844046
Average (Standard dev.)0.0001856584 (±0.029917542)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 385.56 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_36286_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_36286_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM structure of Gi1-bound mGlu2-mGlu4 heterodimer

EntireName: Cryo-EM structure of Gi1-bound mGlu2-mGlu4 heterodimer
Components
  • Complex: Cryo-EM structure of Gi1-bound mGlu2-mGlu4 heterodimer

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Supramolecule #1: Cryo-EM structure of Gi1-bound mGlu2-mGlu4 heterodimer

SupramoleculeName: Cryo-EM structure of Gi1-bound mGlu2-mGlu4 heterodimer
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.8 µm
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 70.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 939819

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