Control of Intra- versus Extracellular Bioorthogonal Catalysis Using Surface-Engineered Nanozymes.

Bioorthogonal transformation of prodrugs and profluorophores using transition metal catalysts (TMCs) offers a promising strategy for therapeutic and imaging applications. Here, we report the surface engineering of nanoparticles to specifically localize gold nanoparticles (AuNPs) with encapsulated TMCs (nanozymes) to either the inside or outside of cells. The ability to control nanozyme localization and hence activity was demonstrated by the activation of pro-fluorophores and prodrugs intra- and extracellularly, establishing the potential of engineered nanozyme platforms for both diagnostic and therapeutic purposes.