For recent reviews on branched chain amino acid, threonine and lysine synthesis, see:
Singh BK 1999 Biosynthesis of valine, leucine, and isoleucine. In (BK Singh ed.) "Plant Amino Acids: Biochemistry and Biotechnology", Marcel Dekker, NY, pp. 227-247.
Matthews BF 1999 Lysine, threonine, and methionine biosynthesis. In (BK Singh ed.) "Plant Amino Acids: Biochemistry and Biotechnology", Marcel Dekker, NY, pp. 205-225.
Galili G, Larkins BA 1999 Enhancing the content of the essential amino acids lysine and threonine in plants. In (BK Singh ed.) "Plant Amino Acids: Biochemistry and Biotechnology", Marcel Dekker, NY, pp. 487-507.
Wittenbach VA, Abell LM 1999 Inhibitors of valine, leucine, and isoleucine biosynthesis. In (BK Singh ed.) "Plant Amino Acids: Biochemistry and Biotechnology", Marcel Dekker, NY, pp. 385-416.