SNAP-Tagged Nanobodies Enable Reversible Optical Control of a G Protein-Coupled Receptor via a Remotely Tethered Photoswitchable Ligand

Helen Farrants, Vanessa A. Gutzeit, Amanda Acosta-Ruiz, Dirk Trauner, Kai Johnsson, Joshua Levitz, Johannes Broichhagen

Research output: Contribution to journalArticlepeer-review

Abstract

G protein-coupled receptors (GPCRs) mediate the transduction of extracellular signals into complex intracellular responses. Despite their ubiquitous roles in physiological processes and as drug targets for a wide range of disorders, the precise mechanisms of GPCR function at the molecular, cellular, and systems levels remain partially understood. To dissect the function of individual receptor subtypes with high spatiotemporal precision, various optogenetic and photopharmacological approaches have been reported that use the power of light for receptor activation and deactivation. Here, we introduce a novel and, to date, most remote way of applying photoswitchable orthogonally remotely tethered ligands by using a SNAP-tag fused nanobody. Our nanobody-photoswitch conjugates can be used to target a green fluorescent protein-fused metabotropic glutamate receptor by either gene-free application of purified complexes or coexpression of genetically encoded nanobodies to yield robust, reversible control of agonist binding and subsequent downstream activation. By harboring and combining the selectivity and flexibility of both nanobodies and self-labeling proteins (or suicide enzymes), we set the stage for targeting endogenous receptors in vivo.

Original languageEnglish (US)
Pages (from-to)2682-2688
Number of pages7
JournalACS Chemical Biology
Volume13
Issue number9
DOIs
StatePublished - Sep 21 2018

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine

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