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Structural basis of positive allosteric modulation of metabotropic glutamate receptor activation and internalization

Author

Listed:
  • Alexa Strauss

    (Weill Cornell Medicine
    Tri-Institutional Program in Chemical Biology)

  • Alberto J. Gonzalez-Hernandez

    (Weill Cornell Medicine)

  • Joon Lee

    (Weill Cornell Medicine)

  • Nohely Abreu

    (Weill Cornell Medicine)

  • Purushotham Selvakumar

    (Weill Cornell Medicine)

  • Leslie Salas-Estrada

    (Icahn School of Medicine at Mount Sinai)

  • Melanie Kristt

    (Weill Cornell Medicine)

  • Anisul Arefin

    (Weill Cornell Medicine)

  • Kevin Huynh

    (Weill Cornell Medicine)

  • Dagan C. Marx

    (Weill Cornell Medicine)

  • Kristen Gilliland

    (Vanderbilt University)

  • Bruce J. Melancon

    (Vanderbilt University
    Vanderbilt University School of Medicine)

  • Marta Filizola

    (Icahn School of Medicine at Mount Sinai)

  • Joel Meyerson

    (Weill Cornell Medicine)

  • Joshua Levitz

    (Weill Cornell Medicine
    Tri-Institutional Program in Chemical Biology
    Weill Cornell Medicine)

Abstract

The metabotropic glutamate receptors (mGluRs) are neuromodulatory family C G protein coupled receptors which assemble as dimers and allosterically couple extracellular ligand binding domains (LBDs) to transmembrane domains (TMDs) to drive intracellular signaling. Pharmacologically, mGluRs can be targeted at the LBDs by glutamate and synthetic orthosteric compounds or at the TMDs by allosteric modulators. Despite the potential of allosteric compounds as therapeutics, an understanding of the functional and structural basis of their effects is limited. Here we use multiple approaches to dissect the functional and structural effects of orthosteric versus allosteric ligands. We find, using electrophysiological and live cell imaging assays, that both agonists and positive allosteric modulators (PAMs) can drive activation and internalization of group II and III mGluRs. The effects of PAMs are pleiotropic, boosting the maximal response to orthosteric agonists and serving independently as internalization-biased agonists across mGluR subtypes. Motivated by this and intersubunit FRET analyses, we determine cryo-electron microscopy structures of mGluR3 in the presence of either an agonist or antagonist alone or in combination with a PAM. These structures reveal PAM-driven re-shaping of intra- and inter-subunit conformations and provide evidence for a rolling TMD dimer interface activation pathway that controls G protein and beta-arrestin coupling.

Suggested Citation

  • Alexa Strauss & Alberto J. Gonzalez-Hernandez & Joon Lee & Nohely Abreu & Purushotham Selvakumar & Leslie Salas-Estrada & Melanie Kristt & Anisul Arefin & Kevin Huynh & Dagan C. Marx & Kristen Gillila, 2024. "Structural basis of positive allosteric modulation of metabotropic glutamate receptor activation and internalization," Nature Communications, Nature, vol. 15(1), pages 1-17, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50548-x
    DOI: 10.1038/s41467-024-50548-x
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