LAUSR

Abstract Chemical labelling can significantly extend the structures and functions of proteins for advanced applications. Herein, a highly efficient bench-stable reagent diazo-azide was designed and synthesized for the incorporation of tetrafluorinated aromatic azides into proteins via the diazonium coupling. The diazo-azide-labelled proteins could be further functionalized via the nonhydrolysis Staudinger reaction to achieve fluorescence labelling, PEGylation and biotinylation. The whole protein labelling processes were catalysis-free and could be finished within several hours under the mild conditions. To this end, we have prepared thickened viral nanoparticles with controllable diameters.