[English] 日本語
Yorodumi
- PDB-9rgn: SsCl at pH 6.5 + IVM - Partially opened -

+
Open data


ID or keywords:

Loading...

-
Basic information

Entry
Database: PDB / ID: 9rgn
TitleSsCl at pH 6.5 + IVM - Partially opened
ComponentspH gated chloride channel
KeywordsMEMBRANE PROTEIN / Ion channel / pLGIC / pH-sensitive channel / Ivermectin
Function / homology
Function and homology information


ligand-gated monoatomic anion channel activity / chloride channel activity / extracellular ligand-gated monoatomic ion channel activity / transmembrane signaling receptor activity / plasma membrane
Similarity search - Function
Gamma-aminobutyric acid A receptor/Glycine receptor alpha / 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
Chem-IVM / pH gated chloride channel
Similarity search - Component
Biological speciesSarcoptes scabiei (arthropod)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsKleiz-Ferreira, J. / Brams, M. / Harrison, P.J. / Gallagher, C. / Nys, M. / Donze, Y. / Quigley, A. / Bertrand, D. / Ulens, C.
Funding support Belgium, 2items
OrganizationGrant numberCountry
KU LeuvenC14/23/128 Belgium
Research Foundation - Flanders (FWO)G087921N Belgium
CitationJournal: Nat Commun / Year: 2026
Title: Structure of a pH-sensitive pentameric ligand-gated ion channel from the Sarcoptes scabies mite.
Authors: Jessica Kleiz-Ferreira / Marijke Brams / Peter J Harrison / Casey I Gallagher / Mieke Nys / Ysaline Donze / Andrew Quigley / Daniel Bertrand / Chris Ulens /
Abstract: Scabies is a skin infestation caused by the mite Sarcoptes scabiei and represents a substantial global health burden exacerbated by emerging resistance to ivermectin. An anionic pentameric ligand- ...Scabies is a skin infestation caused by the mite Sarcoptes scabiei and represents a substantial global health burden exacerbated by emerging resistance to ivermectin. An anionic pentameric ligand-gated ion channel from the mite, SsCl, shows pH-sensitivity and is significantly modulated by ivermectin. Here, we use cryo-EM and electrophysiology to explore the pH-sensing mechanisms of SsCl and the impact of ivermectin on channel activity. Structures of SsCl were resolved in closed (pH 6.5) and desensitized (pH 9) states, alongside ivermectin-bound conformations. The desensitized structure adopts an unexpected hourglass conformation, suggesting a gating mechanism closer related to cation-selective channels. Structural analysis and mutagenesis identify extracellular histidine and glutamic acid residues that impact the pH-sensitivity, likely contributing to a broader pH-sensing network. Ivermectin-bound structures reveal pH-dependent modulation, enhancing open-state prevalence at pH 9 and enabling atypical activation at pH 6.5. These findings offer initial insights into SsCl's pH-sensitivity and ivermectin's activity, informing next-generation antiparasitic design.
History
DepositionJun 6, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 18, 2026Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Mar 18, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Mar 25, 2026Group: Data collection / Database references / Structure summary
Category: audit_author / citation ...audit_author / citation / citation_author / em_admin / em_author_list
Item: _audit_author.name / _citation.country ..._audit_author.name / _citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update / _em_author_list.author
Revision 1.1Mar 25, 2026Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary
Data content type: EM metadata / EM metadata ...EM metadata / EM metadata / EM metadata / EM metadata
Category: citation / citation_author ...citation / citation_author / em_admin / em_author_list
Data content type: EM metadata / EM metadata ...EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update / _em_author_list.author

-
Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

-
Assembly

Deposited unit
A: pH gated chloride channel
B: pH gated chloride channel
C: pH gated chloride channel
D: pH gated chloride channel
E: pH gated chloride channel
hetero molecules


Theoretical massNumber of molelcules
Total (without water)203,19510
Polymers198,8205
Non-polymers4,3755
Water00
1


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

-
Components

#1: Protein
pH gated chloride channel


Mass: 39763.938 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Details: Truncated intracellular region, with a linker. / Source: (gene. exp.) Sarcoptes scabiei (arthropod) / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: A8SDP7
#2: Chemical
ChemComp-IVM / (2aE,4E,5'S,6S,6'R,7S,8E,11R,13R,15S,17aR,20R,20aR,20bS)-6'-[(2S)-butan-2-yl]-20,20b-dihydroxy-5',6,8,19-tetramethyl-17 -oxo-3',4',5',6,6',10,11,14,15,17,17a,20,20a,20b-tetradecahydro-2H,7H-spiro[11,15-methanofuro[4,3,2-pq][2,6]benzodioxacy clooctadecine-13,2'-pyran]-7-yl 2,6-dideoxy-4-O-(2,6-dideoxy-3-O-methyl-alpha-L-arabino-hexopyranosyl)-3-O-methyl-alpha-L-arabino-hexopyranoside / 22,23-DIHYDROAVERMECTIN B1A / IVERMECTIN


Mass: 875.093 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C48H74O14 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

-
Experimental details

-
Experiment

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

-
Sample preparation

ComponentName: Sarcoptes scabies chloride channel (SsCl) / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Sarcoptes scabiei (arthropod)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Cell: Sf9
Buffer solutionpH: 6.5
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: LEICA PLUNGER / Cryogen name: ETHANE

-
Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: OTHER / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: OTHER / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 1 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

-
Processing

EM software
IDNameVersionCategory
1RELION5particle selection
4CTFFINDCTF correction
10RELION5initial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: NONE
Particle selectionNum. of particles selected: 5506940
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 344703 / Symmetry type: POINT
RefinementResolution: 3.1→134.3 Å / Cor.coef. Fo:Fc: 0.936
RfactorNum. reflection% reflection
Rwork0.28302 --
obs0.28302 96509 100 %
Displacement parametersBiso mean: 124.277 Å2
LS refinement shellHighest resolution: 3.1 Å /
Rfactor% reflection
Rfree0 -
Rwork1.899 -
obs-100 %

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more