In enzymology, a dCTP deaminase (dUMP-forming) () is an enzyme that catalyzes the chemical reaction dCTP + 2 H2O dUMP + diphosphate + NH3 Thus, the two substrates of this enzyme are dCTP and H2O, whereas its 3 products are dUMP, diphosphate, and NH3. This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The systematic name of this enzyme class is dCTP aminohydrolase (dUMP-forming). This enzyme participates in pyrimidine metabolism. Structural studies As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes , , and . References EC 3.5.4 Enzymes of known structure