LAUSR

Protein dimerization or oligomerization is a key factor in signal transduction process. It is of great significance to develop novel strategies for investigating protein dimerization in cells and in vivo. Herein, we report a nongenetic proximity-induced fluores-cence resonance energy transfer (FRET) strategy based on DNA tetrahedron for visualizing the receptor dimerization. In this nano-strategy, the aptamer serves as the recognition sequence for specifically binding to the receptor monomer. As long as the receptor dimers exist, the proximity switch probes hybridize with each other to induce the FRET between Cy3 and Cy5. Good stability of DNA tetrahedron in this approach ensures the application value in multiple biological samples. This work provides a new way for developing novel protein dimerization visualization nano-strategies.