3.5.1.13 - 208993 3.5.1.13 sitting-drop vapor diffusion method at room temperature. Structures of the enzyme are determined in its native form and in complex with the analgesic acetanilide, p-acetaminophenol, at 1.70 A and 1.73 A resolutions, respectively. The overall structural fold of the enzyme is identified as an alpha/beta fold class, exhibiting an open twisted beta-sheet core surrounded by alpha-helices 752657