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Significance Photoactivatable proteins are powerful tools for studying biological processes. Light-induced dimers are especially useful because they can be turned on and off with high spatial and temporal resolution in living systems, allowing for control of protein localization and activity. Here, we develop and apply methods for identifying mutations that improve the effectiveness of a light-induced dimer. The engineered switch is modular, can be used in most organisms, has more than 50-fold change in binding affinity upon light stimulation, and can be used to initiate signaling pathways in a specific region of a cell.

Engineering an improved light-induced dimer (iLID) for controlling the localization and activity of signaling proteins