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Legionella pneumophila glucosyltransferase SetA, which is introduced into target cells by a type IV secretion system, affects the intracellular traffic of host cells. Here, we characterized the enzyme activity of the Legionella effector. We report that Asp118 and Arg121 of SetA are essential for glucohydrolase and glucotransferase activities. Exchange of Trp36 to alanine reduced the enzyme activity...