Enzymatic Synthesis of Chiral Phenylalanine Derivatives by a Dynamic Kinetic Resolution of Corresponding Amide and Nitrile Substrates with a Multi-Enzyme System
作者:Kazuyuki Yasukawa、Yasuhisa Asano
DOI:10.1002/adsc.201100923
日期:2012.11.26
improved substrate specificity toward phenylalaninamide was obtained by directed evolution. The mutant ACL racemase and thermostable mutant D-amino acid amidase (DaaA) from Ochrobactrum anthropi SV3 co-expressed in Escherichia coli (pACLmut/pDBFB40) were utilized for synthesis of (R)-phenylalanine and non-natural (R)-phenylalanine derivatives (4-OH, 4-F, 3-F, and 2-F-Phe) by dynamic kinetic resolution
通过定向进化得到了来自无色杆菌的突变的α-氨基-ε-己内酰胺(ACL)消旋酶(L19V / L78T),其对苯丙氨酰胺的底物特异性得到了提高。在大肠杆菌(pACLmut / pDBFB40)中共表达的来自拟人O鱼SV3的突变型ACL消旋酶和热稳定的突变型D-氨基酸酰胺酶(DaaA)被用于合成(R)-苯丙氨酸和非天然(R)-苯丙氨酸衍生物(4-OH,4-F,3-F和2-F-Phe)的动力学动力学分辨率(DKR)。重组大肠杆菌(E.coli)与DaaA和突变ACL消旋酶基因催化(合成- [R )-苯丙氨酸与84%产率和99%的ee值由(RS)-苯丙氨酰胺(400 mM)在22小时内。(- [R )-酪氨酸和4-氟- ([R )-苯丙氨酸也被有效地从相应的酰胺化合物的合成。我们还共同expresed从编码突变ACL消旋酶和L-氨基酸酰胺酶的两个基因缺陷短波单胞在大肠杆菌和执行的高效生产各种(的小号)