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- PDB-8sc4: Human OCT1 bound to metformin in inward-open conformation -

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Basic information

Entry
Database: PDB / ID: 8sc4
TitleHuman OCT1 bound to metformin in inward-open conformation
ComponentsSolute carrier family 22 member 1
KeywordsTRANSPORT PROTEIN / membrane protein / MFS / drug transporter
Function / homology
Function and homology information


putrescine transmembrane transporter activity / acetylcholine transport / (R)-carnitine transmembrane transporter activity / O-acyl-L-carnitine transmembrane transport / pyrimidine nucleoside transmembrane transporter activity / serotonin transport / spermidine transmembrane transporter activity / quaternary ammonium group transmembrane transporter activity / organic cation transport / epinephrine transport ...putrescine transmembrane transporter activity / acetylcholine transport / (R)-carnitine transmembrane transporter activity / O-acyl-L-carnitine transmembrane transport / pyrimidine nucleoside transmembrane transporter activity / serotonin transport / spermidine transmembrane transporter activity / quaternary ammonium group transmembrane transporter activity / organic cation transport / epinephrine transport / purine-containing compound transmembrane transport / quaternary ammonium group transport / acetylcholine transmembrane transporter activity / spermidine transport / Organic cation transport / organic cation transmembrane transporter activity / putrescine transport / dopamine uptake / thiamine transmembrane transport / thiamine transmembrane transporter activity / metanephric proximal tubule development / thiamine transport / toxin transmembrane transporter activity / norepinephrine:sodium symporter activity / prostaglandin transport / prostaglandin transmembrane transporter activity / norepinephrine transport / dopamine:sodium symporter activity / Norepinephrine Neurotransmitter Release Cycle / Abacavir transmembrane transport / neurotransmitter transmembrane transporter activity / serotonin uptake / establishment or maintenance of transmembrane electrochemical gradient / dopamine transport / Neurotransmitter clearance / organic anion transmembrane transporter activity / monoamine transmembrane transporter activity / xenobiotic transport across blood-brain barrier / monoamine transport / Na+/Cl- dependent neurotransmitter transporters / Ciprofloxacin ADME / cellular detoxification / xenobiotic transport / neurotransmitter transport / xenobiotic transmembrane transporter activity / lateral plasma membrane / transport across blood-brain barrier / xenobiotic metabolic process / basal plasma membrane / presynapse / basolateral plasma membrane / apical plasma membrane / identical protein binding / membrane / plasma membrane
Similarity search - Function
Organic cation transport protein/SVOP / Sugar transport proteins signature 1. / Sugar transporter, conserved site / 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
Metformin / Solute carrier family 22 member 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.46 Å
AuthorsZeng, Y.C. / Sobti, M. / Stewart, A.G.
Funding support Australia, 1items
OrganizationGrant numberCountry
National Health and Medical Research Council (NHMRC, Australia)APP2016308 Australia
CitationJournal: Nat Commun / Year: 2023
Title: Structural basis of promiscuous substrate transport by Organic Cation Transporter 1.
Authors: Yi C Zeng / Meghna Sobti / Ada Quinn / Nicola J Smith / Simon H J Brown / Jamie I Vandenberg / Renae M Ryan / Megan L O'Mara / Alastair G Stewart /
Abstract: Organic Cation Transporter 1 (OCT1) plays a crucial role in hepatic metabolism by mediating the uptake of a range of metabolites and drugs. Genetic variations can alter the efficacy and safety of ...Organic Cation Transporter 1 (OCT1) plays a crucial role in hepatic metabolism by mediating the uptake of a range of metabolites and drugs. Genetic variations can alter the efficacy and safety of compounds transported by OCT1, such as those used for cardiovascular, oncological, and psychological indications. Despite its importance in drug pharmacokinetics, the substrate selectivity and underlying structural mechanisms of OCT1 remain poorly understood. Here, we present cryo-EM structures of full-length human OCT1 in the inward-open conformation, both ligand-free and drug-bound, indicating the basis for its broad substrate recognition. Comparison of our structures with those of outward-open OCTs provides molecular insight into the alternating access mechanism of OCTs. We observe that hydrophobic gates stabilize the inward-facing conformation, whereas charge neutralization in the binding pocket facilitates the release of cationic substrates. These findings provide a framework for understanding the structural basis of the promiscuity of drug binding and substrate translocation in OCT1.
History
DepositionApr 4, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 18, 2023Provider: repository / Type: Initial release
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Revision 1.0Oct 18, 2023Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Oct 18, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.1Oct 25, 2023Group: Database references / Category: citation / citation_author
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Revision 1.2Nov 13, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.3May 28, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1May 28, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Solute carrier family 22 member 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)61,3302
Polymers61,2011
Non-polymers1291
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Solute carrier family 22 member 1 / Organic cation transporter 1 / hOCT1


Mass: 61200.664 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC22A1, OCT1 / Production host: Homo sapiens (human) / References: UniProt: O15245
#2: Chemical ChemComp-MF8 / Metformin / N,N-Dimethylimidodicarbonimidic diamide


Mass: 129.164 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C4H11N5 / Feature type: SUBJECT OF INVESTIGATION / Comment: medication, antipsychotic*YM
Has ligand of interestY
Has protein modificationY

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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: Human OCT1 / 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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 88 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.46 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 721723 / Symmetry type: POINT

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