Legionella pneumophila is the causative agent of a severe form of pneumonia known as Legionnaires’ disease. Legionella utilizes a type IV secretion system, encoded by the dot/icm gene cluster, to secrete circa 300 effectors that highjack host cellular function to allow the bacterium to live intracellularly inside macrophages. Although the molecular basis of effector function has been elucidated fo ...