ID 2.6.99.3 DE O-ureido-L-serine synthase. CA hydroxyurea + O-acetyl-L-serine = acetate + H(+) + O-ureido-L-serine. CC -!- The enzyme participates in the biosynthetic pathway of D-cycloserine, CC an antibiotic substance produced by several Streptomyces species. CC -!- Also catalyzes EC 2.5.1.47. DR D2Z027, DCSD_STRLA ; //