Deoxyuridine triphosphatase (DUT) catalyzes the hydrolysis of dUTP to form dUMP and pyrophosphate. Two isoforms of DUT are expressed, generated by alternative splicing. The major one, annotated here, is localized to the nucleoplasm (Ladner et al. 1996). The enzyme is a homotrimer (Mol et al. 1996). In the cell, this reaction depletes the supply of dUTP, preventing its incorporation into DNA, while generating dUMP, the immediate precursor of thymidine nucleotides.