Turn-on fluorescent probe mediated by conjugate addition and cyclization (TCC probe) is a small molecule that reacts with a protein of interest in cells. TCC probe is applicable to various types of proteins by exchanging the ligand unit for target proteins. TCC probes are a potent tool for molecular imaging and chemical proteomics. This protocol describes the synthesis of a TCC probe via unstable intermediate and how to use this probe to visualize vitamin D receptor as a target protein.
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