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Updated: Feb 16, 2026
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Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
Published on: June 9, 2017
17.3K
G-protein-coupled receptors mediate 14-3-3 signal transduction
Hua Li1, Alex Eishingdrelo1, Sathapana Kongsamut2
1BioInvenu Corp., East Hanover, New Jersey, USA.
Signal Transduction and Targeted Therapy
|December 22, 2017
Summary
This study reveals that 14-3-3 proteins are crucial, ligand-regulated regulators of G-protein-coupled receptor (GPCR) signaling, offering new avenues for drug discovery.
Area of Science:
- Cellular signaling pathways
- Molecular pharmacology
- G-protein-coupled receptor (GPCR) research
Background:
- GPCRs are key regulators of cellular processes, but their interacting proteins beyond G-proteins and β-arrestins are poorly understood.
- 14-3-3 proteins are known signal adaptors, yet their specific role in GPCR signaling remains largely unrecognized.
Purpose of the Study:
- To investigate and characterize the involvement of 14-3-3 proteins in GPCR signaling.
- To determine if GPCR-mediated 14-3-3 signaling is a general phenomenon and how it is regulated.
Main Methods:
- Pharmacological characterization of GPCR/14-3-3 interactions.
- Investigation of the phosphorylation-dependence of GPCR-mediated 14-3-3 signaling.
- Analysis of the temporal relationship between GPCR/14-3-3 interaction, receptor desensitization, and internalization.
Main Results:
- GPCR-mediated 14-3-3 signaling is ligand-regulated and occurs more broadly than previously thought.
- This signaling pathway is phosphorylation-dependent and occurs after receptor desensitization and internalization.
- GPCR/14-3-3 signaling can be independent of β-arrestin, with varying agonist potencies.
- GPCRs can facilitate interactions between 14-3-3 proteins and Raf-1 kinase.
Conclusions:
- GPCR-mediated 14-3-3 signaling represents a significant, previously unappreciated aspect of GPCR signal transduction.
- This discovery opens new research directions in GPCR signaling and offers a novel pathway for drug discovery targeting GPCRs.
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