Gram-negative bacteria can use the type III secretion system (T3SS) to inject effector proteins into eukaryotic target cells. In this chapter, we describe the application of a light-controlled T3SS, based on the targeted sequestration of an essential dynamic T3SS component with the help of optogenetic interaction switches. This method enables to control the secretion or injection into eukaryotic cells for a wide range of protein cargos with high temporal and spatial precision.
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