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Protein is one of the most important constituent in living organisms which involves in the physiological metabolism, structural organization, signal transduction, immune recognition and gene transcription. More than 80% proteins are not existed alone but in the protein complex. The need of systematic study of protein-protein interactions (PPI) is emerging to elucidate the role of proteins in living organisms. The abnormal regulation of PPIs can lead in a variety of diseases and therefore it could be very useful in drug discovery. In this study, we proposed a chemical method illuminating signal upon a Cu(I)-catalyzed annulation.. Two major components, sulfonyl azide and functional alkynes, are delivered to the proteins of interest. In the presence of Cu(I) catalyst and reducing agent, a environment-sensitive fluorophore dihydroquinine-4-imine (DQI) was obtained in the chemical transformation with a strong emission at548 nm to reveal the crosslinking of interacting proteins.
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