ID 3.4.21.57 DE leucyl endopeptidase. AN leucine-specific serine proteinase. AN plant Leu-proteinase. CA Hydrolysis of proteins. Preferential cleavage: Leu-|-Xaa in small CA molecule substrates. CC -!- The enzyme from spinach leaves shows high specificity for leucine in CC peptides and 4-nitroanilides. //