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Activation and Inactivation of G Proteins01:22

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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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Uncovering the triggers for GPCR activation using solid-state NMR spectroscopy.

Naoki Kimata1, Philip J Reeves2, Steven O Smith1

  • 1Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794-5215, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 24, 2015
PubMed
Summary

Nuclear magnetic resonance (NMR) studies reveal how retinal isomerization activates rhodopsin subfamily G protein-coupled receptors (GPCRs). This research proposes a general method for identifying activation triggers in other GPCRs using NMR spectroscopy.

Keywords:
G protein-coupled receptorMagic angle spinningSolid-state NMR spectroscopy

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • G protein-coupled receptors (GPCRs) are crucial cell membrane proteins with seven transmembrane helices.
  • GPCRs mediate cellular responses to various extracellular signals.
  • While crystal structures offer insights, the mechanism of ligand-induced activation remains unclear.

Purpose of the Study:

  • To elucidate the conformational changes in GPCRs upon ligand binding.
  • To investigate the specific activation mechanism of the rhodopsin subfamily of GPCRs.
  • To propose a generalizable method for identifying activation triggers in other GPCR subfamilies.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to study GPCRs.
  • Focus was placed on the rhodopsin subfamily of GPCRs.
  • Analysis of structural changes triggered by ligand interaction.

Main Results:

  • NMR studies provided insights into the activation mechanism of rhodopsin subfamily GPCRs.
  • A specific mechanism involving retinal isomerization was proposed for receptor activation.
  • Evidence suggests that activation triggers vary across different GPCR subfamilies.

Conclusions:

  • Retinal isomerization is a key trigger for activating the rhodopsin subfamily of GPCRs.
  • NMR spectroscopy offers a viable approach to determine activation triggers in diverse GPCRs.
  • Understanding GPCR activation mechanisms is vital for drug discovery and development.