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- PDB-7lvt: Structure of full-length GluK1 with L-Glu -

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Basic information

Entry
Database: PDB / ID: 7lvt
TitleStructure of full-length GluK1 with L-Glu
ComponentsIsoform Glur5-2 of Glutamate receptor ionotropic, kainate 1
KeywordsMEMBRANE PROTEIN / ion channel / glutamate receptor / kainate receptor
Function / homologyIsoform Glur5-2 of Glutamate receptor ionotropic, kainate 1
Function and homology information
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.6 Å
AuthorsMeyerson, J.R. / Selvakumar, P.
CitationJournal: Cell Rep / Year: 2021
Title: Structural and compositional diversity in the kainate receptor family.
Authors: Purushotham Selvakumar / Joon Lee / Nandish Khanra / Changhao He / Hermany Munguba / Lisa Kiese / Johannes Broichhagen / Andreas Reiner / Joshua Levitz / Joel R Meyerson /
Abstract: The kainate receptors (KARs) are members of the ionotropic glutamate receptor family and assemble into tetramers from a pool of five subunit types (GluK1-5). Each subunit confers distinct functional ...The kainate receptors (KARs) are members of the ionotropic glutamate receptor family and assemble into tetramers from a pool of five subunit types (GluK1-5). Each subunit confers distinct functional properties to a receptor, but the compositional and stoichiometric diversity of KAR tetramers is not well understood. To address this, we first solve the structure of the GluK1 homomer, which enables a systematic assessment of structural compatibility among KAR subunits. Next, we analyze single-cell RNA sequencing data, which reveal extreme diversity in the combinations of two or more KAR subunits co-expressed within the same cell. We then investigate the composition of individual receptor complexes using single-molecule fluorescence techniques and find that di-heteromers assembled from GluK1, GluK2, or GluK3 can form with all possible stoichiometries, while GluK1/K5, GluK2/K5, and GluK3/K5 can form 3:1 or 2:2 complexes. Finally, using three-color single-molecule imaging, we discover that KARs can form tri- and tetra-heteromers.
History
DepositionFeb 26, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 3, 2021Provider: repository / Type: Initial release
Revision 1.1Nov 10, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Oct 9, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update

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Assembly

Deposited unit
A: Isoform Glur5-2 of Glutamate receptor ionotropic, kainate 1
B: Isoform Glur5-2 of Glutamate receptor ionotropic, kainate 1
C: Isoform Glur5-2 of Glutamate receptor ionotropic, kainate 1
D: Isoform Glur5-2 of Glutamate receptor ionotropic, kainate 1


Theoretical massNumber of molelcules
Total (without water)410,2484
Polymers410,2484
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area11910 Å2
ΔGint-97 kcal/mol
Surface area136740 Å2

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Components

#1: Protein
Isoform Glur5-2 of Glutamate receptor ionotropic, kainate 1 / GluK1 / Glutamate receptor 5 / GluR-5 / GluR5


Mass: 102562.078 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Grik1, Glur5 / Production host: Homo sapiens (human) / References: UniProt: P22756-2
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: GluK1 tetrameric complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 52 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 321611 / Symmetry type: POINT

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