Human OCT1 bound to thiamine in inward-open conformation

Experimental Data Snapshot

  • Resolution: 3.13 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

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Structural basis of promiscuous substrate transport by Organic Cation Transporter 1.

Zeng, Y.C.Sobti, M.Quinn, A.Smith, N.J.Brown, S.H.J.Vandenberg, J.I.Ryan, R.M.O'Mara, M.L.Stewart, A.G.

(2023) Nat Commun 14: 6374-6374

  • DOI: https://doi.org/10.1038/s41467-023-42086-9
  • Primary Citation of Related Structures:  
    8SC1, 8SC2, 8SC3, 8SC4, 8SC6

  • PubMed 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 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.

  • Organizational Affiliation

    Molecular, Structural and Computational Biology Division, The Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia. y.zeng@victorchang.edu.au.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Solute carrier family 22 member 1554Homo sapiensMutation(s): 0 
Gene Names: SLC22A1OCT1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O15245 (Homo sapiens)
Explore O15245 
Go to UniProtKB:  O15245
PHAROS:  O15245
GTEx:  ENSG00000175003 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15245
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
VIB (Subject of Investigation/LOI)
Query on VIB

Download Ideal Coordinates CCD File 
C12 H17 N4 O S
Experimental Data & Validation

Experimental Data

  • Resolution: 3.13 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)AustraliaAPP2016308

Revision History  (Full details and data files)

  • Version 1.0: 2023-10-18
    Type: Initial release
  • Version 1.1: 2023-10-25
    Changes: Database references