Journal
NATURE CHEMICAL BIOLOGY
Volume 8, Issue 7, Pages 631-638Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEMBIO.962
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Funding
- Austrian Science Funds FWF [P-22521]
- Spanish Ministerio de Ciencia e Innovacion (MICINN) [SAF2010-22198-C01-02]
- L'Oreal Fellowship
- German Research Foundation (Graduate College) [804]
- Austrian Science Fund (FWF) [P 22521] Funding Source: researchfish
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Differential targeting of heterotrimeric G protein versus beta-arrestin signaling are emerging concepts in G protein-coupled receptor (GPCR) research and drug discovery, and biased engagement by GPCR ligands of either beta-arrestin or G protein pathways has been disclosed. Herein we report on a new mechanism of ligand bias to titrate the signaling specificity of a cell-surface GPCR. Using a combination of biomolecular and virtual screening, we identified the small-molecule modulator Gue1654, which inhibits G beta gamma but not G alpha signaling triggered upon activation of G alpha(1)-beta gamma by the chemoattractant receptor OXE-R in both recombinant and human primary cells. Gue1654 does not interfere nonspecifically with signaling directly at or downstream of G beta gamma. This hitherto unappreciated mechanism of ligand bias at a GPCR highlights both a new paradigm for functional selectivity and a potentially new strategy to develop pathway-specific therapeutics.
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