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- PDB-8w6o: NaS1 in IN/IN state -

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Basic information

Entry
Database: PDB / ID: 8w6o
TitleNaS1 in IN/IN state
ComponentsSolute carrier family 13 member 1
KeywordsTRANSPORT PROTEIN / NaS1 / apo state / IN/IN state
Function / homology
Function and homology information


sodium:sulfate symporter activity / monoatomic anion:sodium symporter activity / Sodium-coupled sulphate, di- and tri-carboxylate transporters / : / sodium ion transport / transmembrane transport / apical plasma membrane / plasma membrane
Similarity search - Function
Sodium:sulfate symporter transmembrane region / Sodium/sulphate symporter, conserved site / Sodium:sulfate symporter family signature. / Solute carrier family 13
Similarity search - Domain/homology
CHOLESTEROL / Solute carrier family 13 member 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsChi, X. / Chen, Y. / Li, Y. / Zhang, Y. / Shen, Y. / Chen, Y. / Wang, Z. / Yan, R.
Funding support China, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, China)32100975 China
CitationJournal: Sci Adv / Year: 2024
Title: Cryo-EM structures of the human NaS1 and NaDC1 transporters revealed the elevator transport and allosteric regulation mechanism.
Authors: Ximin Chi / Yiming Chen / Yaning Li / Lu Dai / Yuanyuan Zhang / Yaping Shen / Yun Chen / Tianhao Shi / Haonan Yang / Zilong Wang / Renhong Yan /
Abstract: The solute carrier 13 (SLC13) family comprises electrogenic sodium ion-coupled anion cotransporters, segregating into sodium ion-sulfate cotransporters (NaSs) and sodium ion-di- and-tricarboxylate ...The solute carrier 13 (SLC13) family comprises electrogenic sodium ion-coupled anion cotransporters, segregating into sodium ion-sulfate cotransporters (NaSs) and sodium ion-di- and-tricarboxylate cotransporters (NaDCs). NaS1 and NaDC1 regulate sulfate homeostasis and oxidative metabolism, respectively. NaS1 deficiency affects murine growth and fertility, while NaDC1 affects urinary citrate and calcium nephrolithiasis. Despite their importance, the mechanisms of substrate recognition and transport remain insufficiently characterized. In this study, we determined the cryo-electron microscopy structures of human NaS1, capturing inward-facing and combined inward-facing/outward-facing conformations within a dimer both in apo and sulfate-bound states. In addition, we elucidated NaDC1's outward-facing conformation, encompassing apo, citrate-bound, and -(-amylcinnamoyl) anthranilic acid (ACA) inhibitor-bound states. Structural scrutiny illuminates a detailed elevator mechanism driving conformational changes. Notably, the ACA inhibitor unexpectedly binds primarily anchored by transmembrane 2 (TM2), Loop 10, TM11, and TM6a proximate to the cytosolic membrane. Our findings provide crucial insights into SLC13 transport mechanisms, paving the way for future drug design.
History
DepositionAug 29, 2023Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Apr 17, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Solute carrier family 13 member 1
B: Solute carrier family 13 member 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)136,2368
Polymers135,3712
Non-polymers8656
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 Solute carrier family 13 member 1 / Renal sodium/sulfate cotransporter / Na(+)/sulfate cotransporter / hNaSi-1


Mass: 67685.430 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC13A1, NAS1, NASI1 / Production host: Homo sapiens (human) / References: UniProt: Q9BZW2
#2: Chemical
ChemComp-NA / SODIUM ION


Mass: 22.990 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Na / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C27H46O / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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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: Dimer of NaS1 in IN/IN state / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 157920 / Symmetry type: POINT

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