Lipid Modulation of a Class B GPCR: Elucidating the Modulatory Role of PI(4,5)P2 Lipids

Lisbeth R. Kjølbye, Lars Sørensen, Jun Yan, Nils A. Berglund, Jesper Ferkinghoff-Borg, Carol V. Robinson, Birgit Schiøtt*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) lipids have been shown to stabilize an active conformation of class A G-protein coupled receptors (GPCRs) through a conserved binding site, not present in class B GPCRs. For class B GPCRs, previous molecular dynamics (MD) simulation studies have shown PI(4,5)P2 interacting with the Glucagon receptor (GCGR), which constitutes an important target for diabetes and obesity therapeutics. In this work, we applied MD simulations supported by native mass spectrometry (nMS) to study lipid interactions with GCGR. We demonstrate how tail composition plays a role in modulating the binding of PI(4,5)P2 lipids to GCGR. Specifically, we find the PI(4,5)P2 lipids to have a higher affinity toward the inactive conformation of GCGR. Interestingly, we find that in contrast to class A GPCRs, PI(4,5)P2 appear to stabilize the inactive conformation of GCGR through a binding site conserved across class B GPCRs but absent in class A GPCRs. This suggests differences in the regulatory function of PI(4,5)P2 between class A and class B GPCRs.

Original languageEnglish
JournalJournal of Chemical Information and Modeling
Volume62
Issue24
Pages (from-to)6788-6802
Number of pages15
ISSN1549-9596
DOIs
Publication statusPublished - Dec 2022

Keywords

  • Binding Sites
  • Lipids/chemistry
  • Molecular Conformation
  • Molecular Dynamics Simulation
  • Receptors, G-Protein-Coupled/chemistry

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