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Local membrane charge regulates β2 adrenergic receptor coupling to Gi3

Author

Listed:
  • M. J. Strohman

    (Stanford University School of Medicine)

  • S. Maeda

    (Stanford University School of Medicine)

  • D. Hilger

    (Stanford University School of Medicine)

  • M. Masureel

    (Stanford University School of Medicine)

  • Y. Du

    (Stanford University School of Medicine)

  • B. K. Kobilka

    (Stanford University School of Medicine)

Abstract

The β2 adrenergic receptor (β2AR) signals through both Gs and Gi in cardiac myocytes, and the Gi pathway counteracts the Gs pathway. However, Gi coupling is much less efficient than Gs coupling in most cell-based and biochemical assays, making it difficult to study β2AR−Gi interactions. Here we investigate the role of phospholipid composition on Gs and Gi coupling. While negatively charged phospholipids are known to enhance agonist affinity and stabilize an active state of the β2AR, we find that they impair coupling to Gi3 and facilitate coupling to Gs. Positively charged Ca2+ and Mg2+, known to interact with the negative charge on phospholipids, facilitates Gi3 coupling. Mutational analysis suggests that Ca2+ coordinates an interaction between phospholipid and the negatively charged EDGE motif on the amino terminal helix of Gi3. Taken together, our observations suggest that local membrane charge modulates the interaction between β2AR and competing G protein subtypes.

Suggested Citation

  • M. J. Strohman & S. Maeda & D. Hilger & M. Masureel & Y. Du & B. K. Kobilka, 2019. "Local membrane charge regulates β2 adrenergic receptor coupling to Gi3," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10108-0
    DOI: 10.1038/s41467-019-10108-0
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    Cited by:

    1. Shun Kaneko & Shunsuke Imai & Tomomi Uchikubo-Kamo & Tamao Hisano & Nobuaki Asao & Mikako Shirouzu & Ichio Shimada, 2024. "Structural and dynamic insights into the activation of the μ-opioid receptor by an allosteric modulator," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    2. Zoe Köck & Kilian Schnelle & Margherita Persechino & Simon Umbach & Hannes Schihada & Dovile Januliene & Kristian Parey & Steffen Pockes & Peter Kolb & Volker Dötsch & Arne Möller & Daniel Hilger & Fr, 2024. "Cryo-EM structure of cell-free synthesized human histamine 2 receptor/Gs complex in nanodisc environment," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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