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A high-resolution description of β1-adrenergic receptor functional dynamics and allosteric coupling from backbone NMR

Author

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  • Anne Grahl

    (University of Basel)

  • Layara Akemi Abiko

    (University of Basel)

  • Shin Isogai

    (University of Basel)

  • Timothy Sharpe

    (University of Basel)

  • Stephan Grzesiek

    (University of Basel)

Abstract

Signal transmission and regulation of G-protein-coupled receptors (GPCRs) by extra- and intracellular ligands occurs via modulation of complex conformational equilibria, but their exact kinetic details and underlying atomic mechanisms are unknown. Here we quantified these dynamic equilibria in the β1-adrenergic receptor in its apo form and seven ligand complexes using 1H/15N NMR spectroscopy. We observe three major exchanging conformations: an inactive conformation (Ci), a preactive conformation (Cp) and an active conformation (Ca), which becomes fully populated in a ternary complex with a G protein mimicking nanobody. The Ci ↔ Cp exchange occurs on the microsecond scale, the Cp ↔ Ca exchange is slower than ~5 ms and only occurs in the presence of two highly conserved tyrosines (Y5.58, Y7.53), which stabilize the active conformation of TM6. The Cp→Ca chemical shift changes indicate a pivoting motion of the entire TM6 that couples the effector site to the orthosteric ligand pocket.

Suggested Citation

  • Anne Grahl & Layara Akemi Abiko & Shin Isogai & Timothy Sharpe & Stephan Grzesiek, 2020. "A high-resolution description of β1-adrenergic receptor functional dynamics and allosteric coupling from backbone NMR," Nature Communications, Nature, vol. 11(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15864-y
    DOI: 10.1038/s41467-020-15864-y
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    Cited by:

    1. Andrew J. Y. Jones & Thomas H. Harman & Matthew Harris & Oliver E. Lewis & Graham Ladds & Daniel Nietlispach, 2024. "Binding kinetics drive G protein subtype selectivity at the β1-adrenergic receptor," Nature Communications, Nature, vol. 15(1), pages 1-17, December.
    2. Kazem Asadollahi & Sunnia Rajput & Lazarus Andrew Zhang & Ching-Seng Ang & Shuai Nie & Nicholas A. Williamson & Michael D. W. Griffin & Ross A. D. Bathgate & Daniel J. Scott & Thomas R. Weikl & Guy N., 2023. "Unravelling the mechanism of neurotensin recognition by neurotensin receptor 1," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    3. Minfei Su & Navid Paknejad & Lan Zhu & Jinan Wang & Hung Nguyen Do & Yinglong Miao & Wei Liu & Richard K. Hite & Xin-Yun Huang, 2022. "Structures of β1-adrenergic receptor in complex with Gs and ligands of different efficacies," Nature Communications, Nature, vol. 13(1), pages 1-13, December.

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