Abstract
AbstractWe 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 (A2AAR). 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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