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Keywords:

  • alkenes;
  • cycloaddition;
  • fluorescent probes;
  • photochemistry;
  • protein modifications

Abstract

Thumbnail image of graphical abstract

The light-induced formation of a covalent bond between an alkene group and a tetrazole moiety has been used for the selective labeling of proteins in vitro and in live cells. This bioorthogonal ligation initiated by brief irradiation with UV light leads to a fluorescent pyrazoline adduct (see scheme).