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- PDB-8x2n: Cryo-EM structure of human DRA (SLC26A3) at pH 6.5 -

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Basic information

Entry
Database: PDB / ID: 8x2n
TitleCryo-EM structure of human DRA (SLC26A3) at pH 6.5
ComponentsChloride anion exchanger
KeywordsTRANSPORT PROTEIN / DRA / SLC26A3 / acidic pH
Function / homology
Function and homology information


Defective SLC26A3 causes congenital secretory chloride diarrhea 1 (DIAR1) / Multifunctional anion exchangers / sulfate transmembrane transporter activity / oxalate transmembrane transporter activity / sulfate transmembrane transport / secondary active sulfate transmembrane transporter activity / intracellular pH elevation / chloride:bicarbonate antiporter activity / solute:inorganic anion antiporter activity / bicarbonate transmembrane transporter activity ...Defective SLC26A3 causes congenital secretory chloride diarrhea 1 (DIAR1) / Multifunctional anion exchangers / sulfate transmembrane transporter activity / oxalate transmembrane transporter activity / sulfate transmembrane transport / secondary active sulfate transmembrane transporter activity / intracellular pH elevation / chloride:bicarbonate antiporter activity / solute:inorganic anion antiporter activity / bicarbonate transmembrane transporter activity / membrane hyperpolarization / monoatomic anion transport / chloride transmembrane transporter activity / sperm capacitation / monoatomic ion transport / cellular response to cAMP / sperm midpiece / chloride transmembrane transport / brush border membrane / apical plasma membrane / membrane / plasma membrane
Similarity search - Function
Sulphate anion transporter, conserved site / SLC26A transporters signature. / SLC26A/SulP transporter / SLC26A/SulP transporter domain / Sulfate permease family / STAS domain / STAS domain profile. / STAS domain / STAS domain superfamily
Similarity search - Domain/homology
Chloride anion exchanger
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.18 Å
AuthorsYang, X. / Zhang, Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: To Be Published
Title: Cryo-EM structure of human DRA (SLC26A3) at pH 6.5
Authors: Yang, X. / Zhang, Y.
History
DepositionNov 9, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 14, 2025Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Revision 1.0May 14, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Chloride anion exchanger
B: Chloride anion exchanger


Theoretical massNumber of molelcules
Total (without water)171,7562
Polymers171,7562
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Chloride anion exchanger / DRA


Mass: 85877.844 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC26A3 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P40879
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: DRA / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 6.5
SpecimenConc.: 9 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 281 K

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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 magnification: 105000 X / Nominal defocus max: 1900 nm / Nominal defocus min: 1400 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 2.29 sec. / Electron dose: 50.18 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3871
EM imaging opticsEnergyfilter name: GIF Quantum ER / Energyfilter slit width: 20 eV

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Processing

EM softwareName: SerialEM / Category: image acquisition
CTF correctionType: NONE
3D reconstructionResolution: 3.18 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 91665 / Symmetry type: POINT

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