Cryo-EM structure of bovine concentrative nucleoside transporter 3 in complex with Molnupiravir, condition 1, INT1-INT1-INT3 conformation

Experimental Data Snapshot

  • Resolution: 3.19 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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Antiviral drug recognition and elevator-type transport motions of CNT3.

Wright, N.J.Zhang, F.Suo, Y.Kong, L.Yin, Y.Fedor, J.G.Sharma, K.Borgnia, M.J.Im, W.Lee, S.Y.

(2024) Nat Chem Biol 

  • DOI: https://doi.org/10.1038/s41589-024-01559-8
  • Primary Citation of Related Structures:  
    8TZ1, 8TZ2, 8TZ3, 8TZ4, 8TZ5, 8TZ6, 8TZ7, 8TZ8, 8TZ9, 8TZA, 8TZD

  • PubMed Abstract: 

    Nucleoside analogs have broad clinical utility as antiviral drugs. Key to their systemic distribution and cellular entry are human nucleoside transporters. Here, we establish that the human concentrative nucleoside transporter 3 (CNT3) interacts with antiviral drugs used in the treatment of coronavirus infections. We report high-resolution single-particle cryo-electron microscopy structures of bovine CNT3 complexed with antiviral nucleosides N 4 -hydroxycytidine, PSI-6206, GS-441524 and ribavirin, all in inward-facing states. Notably, we found that the orally bioavailable antiviral molnupiravir arrests CNT3 in four distinct conformations, allowing us to capture cryo-electron microscopy structures of drug-loaded outward-facing and drug-loaded intermediate states. Our studies uncover the conformational trajectory of CNT3 during membrane transport of a nucleoside analog antiviral drug, yield new insights into the role of interactions between the transport and the scaffold domains in elevator-like domain movements during drug translocation, and provide insights into the design of nucleoside analog antiviral prodrugs with improved oral bioavailability.

  • Organizational Affiliation

    Department of Biochemistry, Duke University School of Medicine, Durham, NC, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sodium/nucleoside cotransporter
A, B, C
715Bos taurusMutation(s): 0 
Gene Names: SLC28A3
Membrane Entity: Yes 
Find proteins for F1MGR1 (Bos taurus)
Explore F1MGR1 
Go to UniProtKB:  F1MGR1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF1MGR1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.19 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR21AI166134

Revision History  (Full details and data files)

  • Version 1.0: 2024-03-13
    Type: Initial release