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

Anne Grahl, Layara Akemi Abiko, Shin Isogai, Timothy Sharpe and Stephan Grzesiek ()
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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

Nature Communications, 2020, vol. 11, issue 1, 1-13

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-15864-y

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