Reaction catalyzed by D-threonine aldolase (4.1.2.42)
+
=
+
glycine
+
4-methylbenzaldehyde
=
(2R,3S)-2-amino-3-hydroxy-3-(4-methylphenyl)propanoic acid
+
(2R,3R)-2-amino-3-hydroxy-3-(4-nitrophenyl)propanoic acid