A photocaged orexin-B for spatiotemporally precise control of orexin signaling

Cell Chem Biol. 2022 Dec 15;29(12):1729-1738.e8. doi: 10.1016/j.chembiol.2022.11.007. Epub 2022 Dec 7.

Abstract

Orexin neuropeptides carry out important neuromodulatory functions in the brain, yet tools to precisely control the activation of endogenous orexin signaling are lacking. Here, we developed a photocaged orexin-B (photo-OXB) through a C-terminal photocaging strategy. We show that photo-OXB is unable to activate its cognate receptors in the dark but releases functionally active native orexin-B upon uncaging by illumination with UV-visible (UV-vis) light (370-405 nm). We established an all-optical assay combining photo-OXB with a genetically encoded orexin biosensor and used it to characterize the efficiency and spatial profile of photo-OXB uncaging. Finally, we demonstrated that photo-OXB enables optical control over orexin signaling with fine temporal precision both in vitro and ex vivo. Thus, our photocaging strategy and photo-OXB advance the chemical biological toolkit by introducing a method for the optical control of peptide signaling and physiological function.

Keywords: G protein-coupled receptor; biosensor; genetically encoded sensor; neuropeptides; orexin-B; photocage.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Intracellular Signaling Peptides and Proteins*
  • Neuropeptides*
  • Orexin Receptors
  • Orexins
  • Receptors, G-Protein-Coupled
  • Signal Transduction

Substances

  • Orexins
  • Orexin Receptors
  • Intracellular Signaling Peptides and Proteins
  • Neuropeptides
  • Receptors, G-Protein-Coupled