Detection of protein-protein interaction by bioluminescence resonance energy transfer from firefly luciferase to red fluorescent protein.

We describe a novel homogeneous protein-protein interaction assay based on bioluminescence resonance energy transfer (BRET) from mutant firefly luciferase to red fluorescent protein (DsRed). The association of glutathione S-transferase (GST)-luciferase and protein G-DsRed, which was driven by the addition of anti-GST antibody, was successfully monitored by BRET.