A biased ligand for OXE-R uncouples Gα and Gβγ signaling within a heterotrimer

Stefanie Blättermann, Lucas Peters, Philipp Aaron Ottersbach, Andreas Bock, Viktoria Konya, C David Weaver, Angel Gonzalez, Ralf Schröder, Rahul Tyagi, Petra Luschnig, Jürgen Gäb, Stephanie Hennen, Trond Ulven, Leonardo Pardo, Klaus Mohr, Michael Gütschow, Akos Heinemann, Evi Kostenis

    61 Citations (Scopus)

    Abstract

    Differential targeting of heterotrimeric G protein versus β-arrestin signaling are emerging concepts in G protein-coupled receptor (GPCR) research and drug discovery, and biased engagement by GPCR ligands of either b-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 Gβγ but not Ga signaling triggered upon activation of Gαi-βγ 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 Gβγ. 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.

    Original languageEnglish
    JournalNature Chemical Biology
    Volume8
    Issue number7
    Pages (from-to)631-638
    Number of pages8
    ISSN1552-4450
    DOIs
    Publication statusPublished - Jul 2012

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