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Cryo-EM structures of human bradykinin receptor-Gq proteins complexes

Author

Listed:
  • Jinkang Shen

    (Zhejiang University)

  • Dongqi Zhang

    (Zhejiang University)

  • Yao Fu

    (Zhejiang University)

  • Anqi Chen

    (Zhejiang University)

  • Xiaoli Yang

    (Zhejiang University)

  • Haitao Zhang

    (Zhejiang University
    Zhejiang University School of Medicine)

Abstract

The type 2 bradykinin receptor (B2R) is a G protein-coupled receptor (GPCR) in the cardiovascular system, and the dysfunction of B2R leads to inflammation, hereditary angioedema, and pain. Bradykinin and kallidin are both endogenous peptide agonists of B2R, acting as vasodilators to protect the cardiovascular system. Here we determine two cryo-electron microscopy (cryo-EM) structures of human B2R-Gq in complex with bradykinin and kallidin at 3.0 Å and 2.9 Å resolution, respectively. The ligand-binding pocket accommodates S-shaped peptides, with aspartic acids and glutamates as an anion trap. The phenylalanines at the tail of the peptides induce significant conformational changes in the toggle switch W2836.48, the conserved PIF, DRY, and NPxxY motifs, for the B2R activation. This further induces the extensive interactions of the intracellular loops ICL2/3 and helix 8 with Gq proteins. Our structures elucidate the molecular mechanisms for the ligand binding, receptor activation, and Gq proteins coupling of B2R.

Suggested Citation

  • Jinkang Shen & Dongqi Zhang & Yao Fu & Anqi Chen & Xiaoli Yang & Haitao Zhang, 2022. "Cryo-EM structures of human bradykinin receptor-Gq proteins complexes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28399-1
    DOI: 10.1038/s41467-022-28399-1
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