• In enzymology, an allophanate hydrolase (EC 3.5.1.54) is an enzyme that catalyzes the chemical reaction allophanate + 3 H2O + H+ ⇌ {\displaystyle \rightleftharpoons } 2 HCO3− + 2 NH4+ Thus, the two substrates of this enzyme are allophanate (urea-1-carboxylate or N-carbamoylcarbamate) and H2O, whereas its two products are HCO3− and NH4+. (wikipedia.org)
  • In enzymology, an urea carboxylase (EC 6.3.4.6) is an enzyme that catalyzes the chemical reaction ATP + urea + HCO3- ⇌ {\displaystyle \rightleftharpoons } ADP + phosphate + urea-1-carboxylate The 3 substrates of this enzyme are ATP, urea, and HCO3-, whereas its 3 products are ADP, phosphate, and urea-1-carboxylate (allophanate). (wikipedia.org)