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Related Concept Videos

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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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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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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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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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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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Updated: Jan 18, 2026

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KCTD Family: Emerging Regulators of GPCR Biased Signaling.

Wentong Jiang1, Sanduo Zheng2,3

  • 1National Institute of Biological Sciences, Beijing, China.

Handbook of Experimental Pharmacology
|September 9, 2025
PubMed
Summary

Researchers explore KCTD family proteins as novel targets for selectively modulating G protein-coupled receptor (GPCR) signaling. These proteins regulate Gβγ subunits, offering a new strategy for biased signaling with minimal impact on Gα pathways.

Keywords:
GPCR desensitizationGβγKCTD familyUbiquitination

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Area of Science:

  • Molecular Pharmacology
  • Cellular Signaling
  • Biochemistry

Background:

  • G protein-coupled receptors (GPCRs) activate diverse signaling pathways involving G proteins, GRKs, and β-arrestins.
  • Biased signaling allows GPCRs to selectively activate specific transducers via distinct conformational states.
  • Modulating specific G protein subunits (Gα vs. Gβγ) is an underexplored strategy for GPCR signaling control.

Purpose of the Study:

  • To introduce the KCTD family of proteins.
  • To summarize their role in regulating GPCR signaling, particularly Gβγ subunits.
  • To highlight research gaps and future directions in KCTD-mediated GPCR modulation.

Main Methods:

  • Review of existing literature on KCTD proteins and GPCR signaling.
  • Analysis of KCTD mechanisms in Gβγ degradation and uncoupling.
  • Identification of potential therapeutic strategies targeting KCTD family members.

Main Results:

  • KCTD proteins critically regulate GPCR signaling by affecting Gβγ subunits.
  • KCTDs can mediate Gβγ degradation or uncouple Gβγ from effectors.
  • This provides a basis for selective Gβγ pathway modulation.

Conclusions:

  • The KCTD family represents a promising target for developing biased GPCR ligands.
  • Selective modulation of Gβγ signaling via KCTDs could offer therapeutic advantages.
  • Further research is needed to fully elucidate KCTD functions and therapeutic potential.