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Photocrosslinking is an important approach that allows discovery and detailed investigation of protein–protein, protein–oligonucleotide, and protein–small molecule interactions with high temporal and spatial resolution. A major limitation to the universal application of this methodology is the site-specific introduction of efficient aliphatic photocrosslinking probes into proteins of interest. Here, we report a novel aliphatic diazirine amino acid and its genetically encoded, site-specific incorporation into proteins in bacterial and mammalian cells. Furthermore, we demonstrate efficient photocrosslinking of a test proteinin vitro and in vivo.
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