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- EMDB-52784: Sulfate transporter SLC26A11 in nanodiscs with nanobody Nb11 -

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Basic information

Entry
Database: EMDB / ID: EMD-52784
TitleSulfate transporter SLC26A11 in nanodiscs with nanobody Nb11
Map datasharpened map from Cryosparc
Sample
  • Complex: SLC26A11 with nanobody Nb11 reconstituted into MSP1-E3D1 nanodiscs together with soyPC
    • Protein or peptide: Sodium-independent sulfate anion transporter
    • Protein or peptide: nanobody Nb11
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CHLORIDE ION
Keywordssulfate transporter / chloride channel / lysosome / MEMBRANE PROTEIN
Function / homology
Function and homology information


Transport and metabolism of PAPS / oxalate transport / Inorganic anion exchange by SLC26 transporters / sulfate transmembrane transporter activity / secondary active sulfate transmembrane transporter activity / sulfate transmembrane transport / monoatomic anion transmembrane transporter activity / chloride:bicarbonate antiporter activity / chloride channel activity / chloride transmembrane transport ...Transport and metabolism of PAPS / oxalate transport / Inorganic anion exchange by SLC26 transporters / sulfate transmembrane transporter activity / secondary active sulfate transmembrane transporter activity / sulfate transmembrane transport / monoatomic anion transmembrane transporter activity / chloride:bicarbonate antiporter activity / chloride channel activity / chloride transmembrane transport / transmembrane transport / basolateral plasma membrane / apical plasma membrane / lysosomal membrane / Golgi apparatus / endoplasmic reticulum / extracellular exosome / 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
Sodium-independent sulfate anion transporter
Similarity search - Component
Biological speciesHomo sapiens (human) / Vicugna pacos (alpaca)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsRasmussen T / Kuhn BT / Bottcher B / Geertsma ER
Funding support Germany, 5 items
OrganizationGrant numberCountry
German Research Foundation (DFG)359471283 Germany
German Research Foundation (DFG)456578072 Germany
German Research Foundation (DFG)525040890 Germany
German Research Foundation (DFG)FOR5046 GE 2841/3-1 Germany
German Research Foundation (DFG)FOR5046 GE 2841/2-1 Germany
CitationJournal: Nat Commun / Year: 2026
Title: SLC26A11 is an atypical solute carrier with dual transport-channel function mediating lysosomal sulfate transport.
Authors: Benedikt T Kuhn / Peter Kovermann / Bassam G Haddad / Tim Rasmussen / Tamsanqa T Hove / Stefanie Bungert-Plümke / Bettina Böttcher / Jan-Philipp Machtens / Christoph Fahlke / Eric R Geertsma /
Abstract: Membrane transporters and channels are generally assumed to be based on distinct structural and functional principles. SLC26A11, a solute carrier with high expression levels in the brain, has been ...Membrane transporters and channels are generally assumed to be based on distinct structural and functional principles. SLC26A11, a solute carrier with high expression levels in the brain, has been proposed to function as either an anion transporter or a channel. Here, we resolve this apparent discrepancy by demonstrating that SLC26A11 is a dual-function protein capable of operating as both a sulfate transporter and a chloride channel. By resolving its structure and combining biochemical studies and molecular dynamics simulations, we show that SLC26A11 exhibits all the hallmarks of a secondary transporter. The mechanistic basis for its selective ion transport identifies the protein as the elusive lysosomal sulfate exporter. Additionally, we demonstrate that SLC26A11 exhibits an uncoupled, channel-like chloride conductance gated by proton:sulfate symport. Our finding that the chloride-conducting state arises from the transport cycle may contribute to the development of therapeutic strategies for treating brain edema, and the identification of its role in lysosome sulfate efflux may provide new approaches to study and treat lysosomal storage diseases.
History
DepositionFeb 11, 2025-
Header (metadata) releaseMar 4, 2026-
Map releaseMar 4, 2026-
UpdateSep 16, 2026-
Current statusSep 16, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_52784.png

Downloads & links

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Map

FileDownload / File: emd_52784.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationsharpened map from Cryosparc
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 200 pix.
= 212.7 Å		1.06 Å/pix.
x 200 pix.
= 212.7 Å		1.06 Å/pix.
x 200 pix.
= 212.7 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0635 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.6
Minimum - Maximum-5.3472366 - 7.62426
Average (Standard dev.)0.011685062 (±0.23299807)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 212.70001 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: half map A

Fileemd_52784_half_map_1.map
Annotationhalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map B

Fileemd_52784_half_map_2.map
Annotationhalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : SLC26A11 with nanobody Nb11 reconstituted into MSP1-E3D1 nanodisc...

EntireName: SLC26A11 with nanobody Nb11 reconstituted into MSP1-E3D1 nanodiscs together with soyPC
Components
  • Complex: SLC26A11 with nanobody Nb11 reconstituted into MSP1-E3D1 nanodiscs together with soyPC
    • Protein or peptide: Sodium-independent sulfate anion transporter
    • Protein or peptide: nanobody Nb11
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CHLORIDE ION

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Supramolecule #1: SLC26A11 with nanobody Nb11 reconstituted into MSP1-E3D1 nanodisc...

SupramoleculeName: SLC26A11 with nanobody Nb11 reconstituted into MSP1-E3D1 nanodiscs together with soyPC
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Sodium-independent sulfate anion transporter

MacromoleculeName: Sodium-independent sulfate anion transporter / type: protein_or_peptide / ID: 1
Details: construct without the disordered C-terminal 23 amino acids of the human gene
Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 62.789668 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MPSSVTALGQ ARSSGPGMAP SACCCSPAAL QRRLPILAWL PSYSLQWLKM DFVAGLSVGL TAIPQALAYA EVAGLPPQYG LYSAFMGCF VYFFLGTSRD VTLGPTAIMS LLVSFYTFHE PAYAVLLAFL SGCIQLAMGV LRLGFLLDFI SYPVIKGFTS A AAVTIGFG ...String:
MPSSVTALGQ ARSSGPGMAP SACCCSPAAL QRRLPILAWL PSYSLQWLKM DFVAGLSVGL TAIPQALAYA EVAGLPPQYG LYSAFMGCF VYFFLGTSRD VTLGPTAIMS LLVSFYTFHE PAYAVLLAFL SGCIQLAMGV LRLGFLLDFI SYPVIKGFTS A AAVTIGFG QIKNLLGLQN IPRPFFLQVY HTFLRIAETR VGDAVLGLVC MLLLLVLKLM RDHVPPVHPE MPPGVRLSRG LV WAATTAR NALVVSFAAL VAYSFEVTGY QPFILTGETA EGLPPVRIPP FSVTTANGTI SFTEMVQDMG AGLAVVPLMG LLE SIAVAK AFASQNNYRI DANQELLAIG LTNMLGSLVS SYPVTGSFGR TAVNAQSGVC TPAGGLVTGV LVLLSLDYLT SLFY YIPKS ALAAVIIMAV APLFDTKIFR TLWRVKRLDL LPLCVTFLLC FWEVQYGILA GALVSLLMLL HSAARPETKV SEGPV LVLQ PASGLSFPAM EALREEILSR ALEVSPPRCL VLECTHVCSI DYTVVLGLGE LLQDFQKQGV ALAFVGLQVP VLRVLL SAD LKGFQYFSTL EEAEKHLRQE

UniProtKB: Sodium-independent sulfate anion transporter

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Macromolecule #2: nanobody Nb11

MacromoleculeName: nanobody Nb11 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Vicugna pacos (alpaca)
Molecular weightTheoretical: 15.871635 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
GSSSQLQLVE SGGGLVQPGG SLRLSCLASG RMFSDIYMGW YRQAPGKQRE LVARITGGGS INYADSVKGR FTISREYGKN TVYLQMNSL KPEDTAVYYC NARYYGSDYW GKGTRVTVSA GRAGEQKLIS EEDLNSAVDH HHHHH

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Macromolecule #3: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 3 / Number of copies: 2 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

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

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Macromolecule #4: CHLORIDE ION

MacromoleculeName: CHLORIDE ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: CL
Molecular weightTheoretical: 35.453 Da

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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

Concentration1 mg/mL
BufferpH: 7.25
Component:
ConcentrationFormulaName
20.0 mMC8H18N2O4SHEPES
150.0 mMNaClsodium chloride
GridModel: Quantifoil R0.6/1 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 150 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.4 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: +20 blot force, 5 sec blot time.

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 2552 / Average exposure time: 75.0 sec. / Average electron dose: 79.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.4000000000000001 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 75000
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

Particle selectionNumber selected: 1325543
CTF correctionSoftware - Name: cryoSPARC (ver. 4.4) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionApplied symmetry - Point group: C2 (2 fold cyclic) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.4) / Number images used: 48803
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.4)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.4)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-9iar:
Sulfate transporter SLC26A11 in nanodiscs with nanobody Nb11

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