The cryo-EM structure of insect gustatory receptor Gr43a from Drosophila melanogaster in complex with fructose

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

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Structural basis for sugar perception by Drosophila gustatory receptors.

Ma, D.Hu, M.Yang, X.Liu, Q.Ye, F.Cai, W.Wang, Y.Xu, X.Chang, S.Wang, R.Yang, W.Ye, S.Su, N.Fan, M.Xu, H.Guo, J.

(2024) Science 383: eadj2609-eadj2609

  • DOI: https://doi.org/10.1126/science.adj2609
  • Primary Citation of Related Structures:  
    8JM9, 8JMA, 8JME, 8JMH, 8JMI, 8X82, 8X83, 8X84

  • PubMed Abstract: 

    Insects rely on a family of seven transmembrane proteins called gustatory receptors (GRs) to encode different taste modalities, such as sweet and bitter. We report structures of Drosophila sweet taste receptors GR43a and GR64a in the apo and sugar-bound states. Both GRs form tetrameric sugar-gated cation channels composed of one central pore domain (PD) and four peripheral ligand-binding domains (LBDs). Whereas GR43a is specifically activated by the monosaccharide fructose that binds to a narrow pocket in LBDs, disaccharides sucrose and maltose selectively activate GR64a by binding to a larger and flatter pocket in LBDs. Sugar binding to LBDs induces local conformational changes, which are subsequently transferred to the PD to cause channel opening. Our studies reveal a structural basis for sugar recognition and activation of GRs.

  • Organizational Affiliation

    Department of Biophysics and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gustatory receptor for sugar taste 43a
A, B, C, D
443Drosophila melanogasterMutation(s): 0 
Gene Names: Gr43aGR43.1CG1712
Membrane Entity: Yes 
Find proteins for Q9V4K2 (Drosophila melanogaster)
Explore Q9V4K2 
Go to UniProtKB:  Q9V4K2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9V4K2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

  • Released Date: 2024-02-07 
  • Deposition Author(s): Ma, D., Guo, J.

Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, China)China2020YFA0908501

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-07
    Type: Initial release
  • Version 1.1: 2024-02-14
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Database references