Lysine carbamoyltransferase  In enzymology, a lysine carbamoyltransferase () is an enzyme that catalyzes the chemical reaction  Thus, the two substrates of this enzyme are carbamoyl phosphate and L-lysine, whereas its two products are phosphate and L-homocitrulline. This enzyme belongs to the family of transferases that transfer one-carbon groups, specifically the carboxy- and carbamoyltransferases. The systematic name of this enzyme class is carbamoyl-phosphate:L-lysine carbamoyltransferase. This enzyme is also called lysine transcarbamylase.