Abstract
We present in-membrane chemical modification (IMCM) for obtaining selective chromophore labeling of intracellular surface cysteines in G-protein-coupled receptors (GPCRs) with minimal mutagenesis. This method takes advantage of the natural protection of most cysteines by the membrane environment. Practical use of IMCM is illustrated with the site-specific introduction of chromophores for NMR and fluorescence spectroscopy in the human κ-opioid receptor (KOR) and the human A2A adenosine receptor (A2A AR). IMCM is applicable to a wide range of in vitro studies of GPCRs, including single-molecule spectroscopy, and is a promising platform for in-cell spectroscopy experiments.
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