Genetically encoded unstrained olefins for live cell labeling with tetrazine dyes†
Abstract
A number of non-canonical amino acids (NCAAs) with unstrained olefins are genetically encoded using mutant pyrrolysyl-tRNA synthetase–tRNAPylCUA pairs. These NCAAs readily undergo inverse electron-demand Diels–Alder cycloadditions with tetrazine dyes, leading to selective labeling of proteins bearing these NCAAs in live cells.