Cytosolic Sulfotransferase 1A1/SULT1A1: ProductsCytosolic sulfotransferases catalyze the sulfonation of many hormones, neurotransmitters, drugs, and xenobiotic compounds. They are distinct from Golgi resident sulfotransferases by the absence of transmembrane domains and are located in the cytoplasm. SULT1A1 is one of two phenol sulfotransferases with thermostable enzyme activity. The enzyme is more specific for sulfonation on catecholamines, phenolic drugs and neurotransmitters. Because of its ability to modify diverse promutagen and procarcinogen xenobiotics, it is implicated in a range of cancers. The crystal structure of the enzyme reveals that its active site is flexible and can accommodate diverse hydrophobic substrates with varying sizes, shapes and flexibility.