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Related Concept Videos

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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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
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Gβγ subunits-Different spaces, different faces.

Shahriar M Khan1, Jennifer Y Sung1, Terence E Hébert1

  • 1Department of Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada.

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Summary

G protein signaling involves Gβγ subunits regulating more than just Gα subunits. Recent research shows Gβγ also controls transcription, cell trafficking, and signaling within organelles, revealing complex non-canonical roles.

Keywords:
G proteinsGPCRsGβγNon-canonical signallingSignallingTranscription

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • G protein-coupled receptors (GPCRs) initiate signaling cascades.
  • Gβγ subunits traditionally modulate canonical effectors at the cell surface.
  • Emerging evidence highlights diverse Gβγ functions beyond GPCR signaling.

Purpose of the Study:

  • To review recent advances in understanding non-canonical roles of Gβγ subunits.
  • To highlight the expanded regulatory functions of Gβγ dimers.
  • To update the perspective on Gβγ signaling importance.

Main Methods:

  • Literature review of recent studies on Gβγ subunit function.
  • Analysis of findings on Gβγ regulation of various cellular processes.
  • Synthesis of current knowledge on non-canonical Gβγ signaling.

Main Results:

  • Gβγ subunits regulate numerous molecules at distinct subcellular locations.
  • Gβγ dimers are identified as regulators of transcription.
  • Gβγ modulates anterograde and retrograde trafficking and second messenger generation in organelles.

Conclusions:

  • Gβγ subunits possess significant non-canonical roles beyond canonical GPCR signaling.
  • These novel functions expand the understanding of Gβγ signaling complexity.
  • Gβγ subunits are crucial regulators in diverse intracellular processes.