A given protein can perform numerous roles in a cell with its participation in protein complexes and distinct localization within the cell playing a critical role in its diverse functions. Thus, the ability to artificially dimerize proteins and recruit proteins to specific locations in a cell has become a powerful tool for the investigation of protein function and the understanding of cell biology. Here, we discuss two systems that have been used to activate signal transduction pathways, a chemically inducible dimerization (CID) and a light-inducible (LI) system to control signaling and cytoskeletal regulation in a spatial and temporal manner.
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