The present invention relates to methods for the stereospecific synthesis and for the enantiomeric enrichment of β-amino acids. A novel D-β-aminotransferase, which exhibits stereoselectivity for D-β-phenylalanine, (D-3 amino-3-phenylpropinine acid) was purified from a newly-isolated strain of
Variouorax paradoxus
. A novel L-β-aminotransferase was purified from a newly-isolated strain of
Alcaligenes eutrophus
. The D- and L-β-aminotransferases can be used to facilitate the stereoselective biosynthesis of β-D-phenylalanine or β-L-phenylalanine, from a mixture of L-glutamic acid or L-alanine, respectively, and 3-keto-3-phenylpropionic acid in the presence of the cofactor pyridoxal phosphate.
本发明涉及β-
氨基酸的立体特异性合成和对映体富集方法。从一株新分离出来的藻类中纯化出了一种新型 D-β-
氨基转移酶,它对 D-β-
苯丙
氨酸(D-3
氨基-3-
苯丙
氨酸)具有立体选择性。
从新分离的
.从一株新分离的藻类中纯化出一种新型 L-β-
氨基转移酶。
藻类
.D- 和 L-β-
氨基转移酶可用于促进β-
D-苯丙氨酸或β-
L-苯丙氨酸的立体选择性
生物合成,分别由
L-谷氨酸或
L-丙氨酸与 3-
酮基-
3-苯基丙酸的混合物在辅助因子
磷酸吡哆醛的存在下合成。