Abstract

We report a genetically encodable m-trifluoromethylaniline modified L-lysine (m-TFMAK) which defluorinates upon light activation and covalently conjugates to native residues via acyl fluoride exchange. The encoded m-TFMAK photo-crosslinks with temporal controllability, residue selectivity, and fluorogenic tracking features, making it suitable for identifying protein interactions in living systems.

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