Local membrane charge regulates β2 adrenergic receptor coupling to Gi3

Local membrane charge regulates β2 adrenergic receptor coupling to Gi3

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 inve...

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Bibliographic Details
Published in:Nature communications 2019-05, Vol.10 (1), p.2234-2234, Article 2234
Main Authors: Strohman, M. J., Maeda, S., Hilger, D., Masureel, M., Du, Y., Kobilka, B. K.
Format: Article
Language:eng
Subjects:
Adrenergic receptors
Calcium
Calcium ions
Cardiomyocytes
Cations
Coupling
Efficiency
Heart failure
Lipids
Magnesium
Myocytes
Phospholipid composition
Phospholipids
Phosphorylation
Proteins
Spectrum analysis
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Summary: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. In the healthy heart, the β2 adrenergic receptor (β2AR) signals through Gs and Gi proteins but the mechanism underlying G protein selectivity is not fully understood. Here, the authors show that membrane charge and intracellular cations modulate the β2AR−Gi3 interaction.
ISSN:2041-1723
2041-1723