An improved fluorescent protein-based expression reporter system that utilizes bioluminescence resonance energy transfer and peptide-assisted complementation.

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Fluorescent protein-based reporter systems are used to track gene expression in cells. Here, we propose a modified bioluminescence resonance energy transfer (BRET) reporter as a maturation-less reporter that utilizes a peptide-assisted complementation strategy. Using effective dimerized peptides obtained from library-versus-library screening with more than 4000 candidates, rapid activation of the reporter was achieved.