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- PDB-8sdu: Structure of rat organic anion transporter 1 (OAT1) -

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Basic information

Entry
Database: PDB / ID: 8sdu
TitleStructure of rat organic anion transporter 1 (OAT1)
ComponentsSolute carrier family 22 member 6
KeywordsTRANSPORT PROTEIN / organic anion transporter / OAT / SLC22 / drug transporter
Function / homology
Function and homology information


Organic anion transport / renal tubular secretion / alpha-ketoglutarate transmembrane transporter activity / alpha-ketoglutarate transport / sodium-independent organic anion transmembrane transporter activity / sodium-independent organic anion transport / metanephric proximal tubule development / prostaglandin transport / prostaglandin transmembrane transporter activity / organic anion transport ...Organic anion transport / renal tubular secretion / alpha-ketoglutarate transmembrane transporter activity / alpha-ketoglutarate transport / sodium-independent organic anion transmembrane transporter activity / sodium-independent organic anion transport / metanephric proximal tubule development / prostaglandin transport / prostaglandin transmembrane transporter activity / organic anion transport / organic anion transmembrane transporter activity / solute:inorganic anion antiporter activity / monoatomic anion transport / antiporter activity / chloride ion binding / xenobiotic transmembrane transporter activity / transmembrane transporter activity / basal plasma membrane / caveola / response to organic cyclic compound / basolateral plasma membrane / protein-containing complex / identical protein binding / plasma membrane
Similarity search - Function
Organic cation transport protein/SVOP / Major facilitator, sugar transporter-like / Sugar (and other) transporter / Major facilitator superfamily domain / Major facilitator superfamily (MFS) profile. / MFS transporter superfamily
Similarity search - Domain/homology
Solute carrier family 22 member 6
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.05 Å
AuthorsDou, T. / Jiang, J.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI) United States
CitationJournal: Nat Struct Mol Biol / Year: 2023
Title: The substrate and inhibitor binding mechanism of polyspecific transporter OAT1 revealed by high-resolution cryo-EM.
Authors: Tongyi Dou / Tengfei Lian / Shi Shu / Yi He / Jiansen Jiang /
Abstract: Organic anion transporters (OATs) of the SLC22 family have crucial roles in the transport of organic anions, including metabolites and therapeutic drugs, and in transporter-mediated drug-drug ...Organic anion transporters (OATs) of the SLC22 family have crucial roles in the transport of organic anions, including metabolites and therapeutic drugs, and in transporter-mediated drug-drug interactions. In the kidneys, OATs facilitate the elimination of metabolic waste products and xenobiotics. However, their transport activities can lead to the accumulation of certain toxic compounds within cells, causing kidney damage. Moreover, OATs are important drug targets, because their inhibition modulates the elimination or retention of substrates linked to diseases. Despite extensive research on OATs, the molecular basis of their substrate and inhibitor binding remains poorly understood. Here we report the cryo-EM structures of rat OAT1 (also known as SLC22A6) and its complexes with para-aminohippuric acid and probenecid at 2.1, 2.8 and 2.9 Å resolution, respectively. Our findings reveal a highly conserved substrate binding mechanism for SLC22 transporters, wherein four aromatic residues form a cage to accommodate the polyspecific binding of diverse compounds.
History
DepositionApr 7, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 18, 2023Provider: repository / Type: Initial release
Revision 1.1Nov 1, 2023Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Nov 22, 2023Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Solute carrier family 22 member 6


Theoretical massNumber of molelcules
Total (without water)60,8171
Polymers60,8171
Non-polymers00
Water1,26170
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Solute carrier family 22 member 6 / Organic anion transporter 1 / rOAT1 / renal organic anion transporter 1 / rROAT1


Mass: 60816.836 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Slc22a6, Oat1 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: O35956
#2: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 70 / Source method: isolated from a natural source / Formula: H2O

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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: Rat OAT1 solubilized in detergent LMNG / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.061 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293
Buffer solutionpH: 8
Details: TBS buffer (20 mM Tris-HCl, 150 mM NaCl, pH 8.0) with 0.01% LMNG
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen 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 FIELDBright-field microscopy / Nominal magnification: 105000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 500 nm / Cs: 2 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 6.25 sec. / Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 8245
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV

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Processing

SoftwareName: UCSF ChimeraX / Version: 1.5/v9 / Classification: model building / URL: https://www.rbvi.ucsf.edu/chimerax/ / Os: Linux / Type: package
EM software
IDNameVersionCategory
1RELION4particle selection
2Leginonimage acquisition
4CTFFIND4CTF correction
10RELIONfinal Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
14PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 395953 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL

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