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A new visualizing method was developed for monitoring protein-protein (P-P) interactions in live mammalian cells. P-P interactions are visualized by directing localization of a bait protein to endosomes. This method is sufficiently robust to analyze signal-dependent P-P interactions such as calcium-dependent protein interactions. We visualized interactions between activated calmodulin and calmodulin-binding proteins, and observed oscillatory interactions via time-lapse imaging. In addition, this new method can simultaneously monitor multiple P-P interactions in a single live cell, which allows comparison of interactions between several prey proteins and a single bait protein. We observed that CaMKK1 and CaMKIIalpha bind calmodulin with distinct binding affinities in live cell, which indicates that calcium signaling is fine-tuned by distinct activation patterns of CaM kinases. This method will enable investigation of cellular processes based on dynamic P-P interactions.

Visualizing dynamic interaction between calmodulin and calmodulin-related kinases via a monitoring method in live mammalian cells