Related Experiment Video

Updated: Sep 21, 2026

Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
16:16

Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors

Published on: September 13, 2013

Characterization of the cDNA and genomic sequence of a G protein gamma subunit (gamma 5)

K J Fisher1, N N Aronson

  • 1Department of Molecular and Cell Biology, Althouse Laboratory, Pennsylvania State University, University Park 16802.

Molecular and Cellular Biology
|April 11, 1992
PubMed

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G Protein-coupled Receptors

G-protein-coupled receptors are ligand-binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that traverses 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 hold onto the G-protein.The G-protein, or guanine nucleotide-binding protein, is a large heterotrimeric complex. Its three subunits...
G-protein Coupled Receptors01:27

G-protein Coupled Receptors

G-protein-coupled receptors are ligand-binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that traverses 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 hold onto the G-protein.The G-protein, or guanine nucleotide-binding protein, is a large heterotrimeric complex. Its three subunits...
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G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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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 affinity and are together...
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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.
GPCRs are also called heptahelical, 7TM, or...