GPCR Activation and Endocytosis Induced by a 2D Material Agonist.

Agonist-induced activation and endocytosis of G protein-coupled receptors (GPCRs) are crucial for a number of physiological and pathological processes. However, tools that are available for probing GPCR endocytosis have been insufficient. Here, we developed a two-dimensional (2D) material agonist by supramolecular self-assembly between an endogenous agonist of κ-opioid receptor (KOR) and 2D molybdenum disulfide. The 2D material agonist has proven to be amenable for eliciting GPCR activation and endocytosis in cells stably expressing KOR rather than in those without KOR expression. Using super-resolution microscopy, we also show that the 2D material agonist colocalizes well with GFP-fused KOR intracellularly. Further, the endocytosed 2D material agonist can selectively produce reactive oxygen species in cells that overly express KOR, as controlled by light irradiation.