In enzymology, a formimidoylglutamate deiminase () is an enzyme that catalyzes the chemical reaction N-formimidoyl-L-glutamate + H2O N-formyl-L-glutamate + NH3 Thus, the two substrates of this enzyme are N-formimidoyl-L-glutamate and H2O, whereas its two products are N-formyl-L-glutamate and NH3. This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in linear amidines. The systematic name of this enzyme class is N-formimidoyl-L-glutamate iminohydrolase. Other names in common use include formiminoglutamate deiminase, and formiminoglutamic iminohydrolase. This enzyme participates in histidine metabolism. References EC 3.5.3 Enzymes of unknown structure