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- PDB-9ex4: CryoEM structure of sTeLIC nanodisc in complex with fluorinated f... -

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Basic information

Entry
Database: PDB / ID: 9ex4
TitleCryoEM structure of sTeLIC nanodisc in complex with fluorinated fos-choline-8 in open state
ComponentsCys-loop ligand-gated ion channel
KeywordsTRANSLOCASE / Ion channel
Function / homology
Function and homology information


extracellular ligand-gated monoatomic ion channel activity / transmembrane signaling receptor activity / metal ion binding / membrane
Similarity search - Function
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
: / HEXANE / Cys-loop ligand-gated ion channel
Similarity search - Component
Biological speciesendosymbiont of Tevnia jerichonana (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.19 Å
AuthorsFan, C. / Howard, R.J. / Lindahl, E.
Funding support1items
OrganizationGrant numberCountry
Swedish Research Council
CitationJournal: Br J Pharmacol / Year: 2025
Title: Vestibular modulation by stimulant derivatives in a pentameric ligand-gated ion channel.
Authors: Emelia Karlsson / Olivia Andén / Chen Fan / Zaineb Fourati / Ahmed Haouz / Yuxuan Zhuang / Rebecca J Howard / Marc Delarue / Erik Lindahl /
Abstract: BACKGROUND AND PURPOSE: Allosteric modulation of pentameric ligand-gated ion channels (pLGICs) are critical for the action of neurotransmitters and many psychoactive drugs. However, details of their ...BACKGROUND AND PURPOSE: Allosteric modulation of pentameric ligand-gated ion channels (pLGICs) are critical for the action of neurotransmitters and many psychoactive drugs. However, details of their modulatory mechanisms remain unclear, especially beyond the orthosteric neurotransmitter-binding sites. The recently reported prokaryotic symbiont of Tevnia jerichonana ligand-gated ion channel (sTeLIC), a pH-gated homologue of eukaryotic receptors in the pLGIC family, is thought to be modulated by aromatic compounds via a relatively uncharacterised modulatory site in the extracellular vestibule.
EXPERIMENTAL APPROACH: We have characterised the effects of psychostimulant derivatives on sTeLIC using two-electrode voltage-clamp electrophysiology in the presence and absence of engineered ...EXPERIMENTAL APPROACH: We have characterised the effects of psychostimulant derivatives on sTeLIC using two-electrode voltage-clamp electrophysiology in the presence and absence of engineered mutations, and determined X-ray and cryo-EM structures of the channel in both closed and open states.
KEY RESULTS: We have shown that sTeLIC is sensitive to potentiation by several amphiphilic compounds, which preferentially bind to a vestibular pocket in the contracted open-state extracellular domain.
CONCLUSIONS AND IMPLICATIONS: This work provides a detailed structure-function mechanism for allosteric potentiation via a noncanonical ligand site, with potential conservation of the eukaryotic ...CONCLUSIONS AND IMPLICATIONS: This work provides a detailed structure-function mechanism for allosteric potentiation via a noncanonical ligand site, with potential conservation of the eukaryotic pentameric ligand-gated ion channels.
History
DepositionApr 5, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 26, 2025Provider: repository / Type: Initial release
Revision 1.0Mar 26, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.1May 28, 2025Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update
Revision 1.2Jul 9, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cys-loop ligand-gated ion channel
B: Cys-loop ligand-gated ion channel
C: Cys-loop ligand-gated ion channel
D: Cys-loop ligand-gated ion channel
E: Cys-loop ligand-gated ion channel
hetero molecules


Theoretical massNumber of molelcules
Total (without water)191,68930
Polymers186,5545
Non-polymers5,13525
Water1,802100
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
Cys-loop ligand-gated ion channel


Mass: 37310.820 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) endosymbiont of Tevnia jerichonana (vent Tica) (bacteria)
Gene: TevJSym_bc00020 / Production host: Escherichia coli (E. coli) / References: UniProt: G2FID1
#2: Chemical
ChemComp-A1H8K / fluorinated fos-choline-8 / trimethyl-[2-[oxidanyl-[3,3,4,4,5,5,6,6,7,7,8,8,8-tridecakis(fluoranyl)octoxy]phosphoryl]oxyethyl]azanium


Mass: 530.239 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C13H18F13NO4P / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical
ChemComp-HEX / HEXANE


Mass: 86.175 Da / Num. of mol.: 15 / Source method: obtained synthetically / Formula: C6H14
#4: Chemical
ChemComp-EPE / 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID / HEPES


Mass: 238.305 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C8H18N2O4S / Comment: pH buffer*YM
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 100 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationN

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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: sTeLIC nanodisc / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: endosymbiont of Tevnia jerichonana (vent Tica) (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7
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: 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: 2400 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 45 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.19 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 148478 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00113495
ELECTRON MICROSCOPYf_angle_d0.38618330
ELECTRON MICROSCOPYf_dihedral_angle_d8.8794850
ELECTRON MICROSCOPYf_chiral_restr0.0391975
ELECTRON MICROSCOPYf_plane_restr0.0032270

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