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- EMDB-23703: Full length alpha1 Glycine receptor in presence of 1mM Glycine -

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Basic information

Entry
Database: EMDB / ID: EMD-23703
TitleFull length alpha1 Glycine receptor in presence of 1mM Glycine
Map datamaps reconstructed independently each using half of the experimental data
Sample
  • Complex: Glycine receptor subunit alpha Z1
    • Protein or peptide: Glycine receptor subunit alphaZ1
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: GLYCINE
Function / homology
Function and homology information


transmitter-gated monoatomic ion channel activity / Neurotransmitter receptors and postsynaptic signal transmission / extracellularly glycine-gated ion channel activity / extracellularly glycine-gated chloride channel activity / cellular response to ethanol / cellular response to zinc ion / regulation of neuron differentiation / neurotransmitter receptor activity / glycine binding / chloride channel complex ...transmitter-gated monoatomic ion channel activity / Neurotransmitter receptors and postsynaptic signal transmission / extracellularly glycine-gated ion channel activity / extracellularly glycine-gated chloride channel activity / cellular response to ethanol / cellular response to zinc ion / regulation of neuron differentiation / neurotransmitter receptor activity / glycine binding / chloride channel complex / ligand-gated monoatomic ion channel activity / transmembrane transporter complex / response to amino acid / monoatomic ion transport / chloride transmembrane transport / central nervous system development / cellular response to amino acid stimulus / transmembrane signaling receptor activity / perikaryon / postsynaptic membrane / neuron projection / dendrite / synapse / zinc ion binding / membrane / plasma membrane
Similarity search - Function
Glycine receptor alpha1 / Glycine receptor alpha / Gamma-aminobutyric acid A receptor/Glycine receptor alpha / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel ...Glycine receptor alpha1 / Glycine receptor alpha / Gamma-aminobutyric acid A receptor/Glycine receptor alpha / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain / Neurotransmitter-gated ion-channel ligand-binding domain superfamily / Neurotransmitter-gated ion-channel ligand binding domain
Similarity search - Domain/homology
Glycine receptor subunit alphaZ1
Similarity search - Component
Biological speciesDanio rerio (zebrafish)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.28 Å
AuthorsKumar A / Chakrapani S
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM134896 United States
American Heart Association20POST35210394 United States
CitationJournal: Nat Commun / Year: 2020
Title: Mechanisms of activation and desensitization of full-length glycine receptor in lipid nanodiscs.
Authors: Arvind Kumar / Sandip Basak / Shanlin Rao / Yvonne Gicheru / Megan L Mayer / Mark S P Sansom / Sudha Chakrapani /
Abstract: Glycinergic synapses play a central role in motor control and pain processing in the central nervous system. Glycine receptors (GlyRs) are key players in mediating fast inhibitory neurotransmission ...Glycinergic synapses play a central role in motor control and pain processing in the central nervous system. Glycine receptors (GlyRs) are key players in mediating fast inhibitory neurotransmission at these synapses. While previous high-resolution structures have provided insights into the molecular architecture of GlyR, several mechanistic questions pertaining to channel function are still unanswered. Here, we present Cryo-EM structures of the full-length GlyR protein complex reconstituted into lipid nanodiscs that are captured in the unliganded (closed), glycine-bound (open and desensitized), and allosteric modulator-bound conformations. A comparison of these states reveals global conformational changes underlying GlyR channel gating and modulation. The functional state assignments were validated by molecular dynamics simulations, and the observed permeation events are in agreement with the anion selectivity and conductance of GlyR. These studies provide the structural basis for gating, ion selectivity, and single-channel conductance properties of GlyR in a lipid environment.
History
DepositionMar 26, 2021-
Header (metadata) releaseAug 3, 2022-
Map releaseAug 3, 2022-
UpdateSep 7, 2022-
Current statusSep 7, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_23703.png

Downloads & links

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Map

FileDownload / File: emd_23703.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationmaps reconstructed independently each using half of the experimental data
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 300 pix.
= 330. Å		1.1 Å/pix.
x 300 pix.
= 330. Å		1.1 Å/pix.
x 300 pix.
= 330. Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0076
Minimum - Maximum-0.018563388 - 0.044490337
Average (Standard dev.)2.5020745e-05 (±0.0009967504)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 330.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: postprocessing maps generated using half maps and softmask...

Fileemd_23703_additional_1.map
Annotationpostprocessing maps generated using half maps and softmask in relion 3.1
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Additional map: maps generated in the final rounds of 3D-autorefinement in relion 3.1

Fileemd_23703_additional_2.map
Annotationmaps generated in the final rounds of 3D-autorefinement in relion 3.1
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: maps reconstructed independently each using half of the...

Fileemd_23703_half_map_1.map
Annotationmaps reconstructed independently each using half of the experimental data
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: maps reconstructed independently each using half of the...

Fileemd_23703_half_map_2.map
Annotationmaps reconstructed independently each using half of the experimental data
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Glycine receptor subunit alpha Z1

EntireName: Glycine receptor subunit alpha Z1
Components
  • Complex: Glycine receptor subunit alpha Z1
    • Protein or peptide: Glycine receptor subunit alphaZ1
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: GLYCINE

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Supramolecule #1: Glycine receptor subunit alpha Z1

SupramoleculeName: Glycine receptor subunit alpha Z1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Danio rerio (zebrafish)
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
Molecular weightTheoretical: 250 kDa/nm

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Macromolecule #1: Glycine receptor subunit alphaZ1

MacromoleculeName: Glycine receptor subunit alphaZ1 / type: protein_or_peptide / ID: 1 / Number of copies: 5 / Enantiomer: LEVO
Source (natural)Organism: Danio rerio (zebrafish)
Molecular weightTheoretical: 50.821711 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MFALGIYLWE TIVFFSLAAS QQAAARKAAS PMPPSEFLDK LMGKVSGYDA RIRPNFKGPP VNVTCNIFIN SFGSIAETTM DYRVNIFLR QQWNDPRLAY SEYPDDSLDL DPSMLDSIWK PDLFFANEKG ANFHEVTTDN KLLRISKNGN VLYSIRITLV L ACPMDLKN ...String:
MFALGIYLWE TIVFFSLAAS QQAAARKAAS PMPPSEFLDK LMGKVSGYDA RIRPNFKGPP VNVTCNIFIN SFGSIAETTM DYRVNIFLR QQWNDPRLAY SEYPDDSLDL DPSMLDSIWK PDLFFANEKG ANFHEVTTDN KLLRISKNGN VLYSIRITLV L ACPMDLKN FPMDVQTCIM QLESFGYTMN DLIFEWDEKG AVQVADGLTL PQFILKEEKD LRYCTKHYNT GKFTCIEARF HL ERQMGYY LIQMYIPSLL IVILSWVSFW INMDAAPARV GLGITTVLTM TTQSSGSRAS LPKVSYVKAI DIWMAVCLLF VFS ALLEYA AVNFIARQHK ELLRFQRRRR HLKEDEAGDG RFSFAAYGMG PACLQAKDGM AIKGNNNNAP TSTNPPEKTV EEMR KLFIS RAKRIDTVSR VAFPLVFLIF NIFYWITYKI IRSEDIHKQ

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Macromolecule #2: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 2 / Number of copies: 5 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #3: GLYCINE

MacromoleculeName: GLYCINE / type: ligand / ID: 3 / Number of copies: 5 / Formula: GLY
Molecular weightTheoretical: 75.067 Da
Chemical component information

ChemComp-GLY:
GLYCINE

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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

Concentration0.1 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
50.0 mM4H11NO3Tris
200.0 mMNaClSodium Chloride
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 4 K / Instrument: FEI VITROBOT MARK IV
Details: 3.5 ul of 0.1 mg/ml protein solution was applied on a grid in the Vitrobot MkIV chamber set to 100% RH at 4 degC for 30s and then blotted for 2 s and plunged.
DetailsFull length Zebrafish GlyR alpha1 homopentamer reconsituted in Nanodisc

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Detector mode: SUPER-RESOLUTION / Number grids imaged: 8 / Number real images: 9700 / Average exposure time: 9.0 sec. / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 130000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.28 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 29483
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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