(S,S)-2,3-Dihydroxy-2,3-dihydrobenzoic Acid: Microbial Access with Engineered Cells ofEscherichia coli and Application as Starting Material in Natural-Product Synthesis
作者:Dirk Franke、Volker Lorbach、Simon Esser、Christian Dose、Georg A. Sprenger、Markus Halfar、Jörg Thömmes、Rolf Müller、Ralf Takors、Michael Müller
DOI:10.1002/chem.200204265
日期:2003.9.5
deletions in chorismate-utilising pathways towards aromatic amino acids, neither chorismate nor any other metabolic intermediates were found as by-products. Fermentation of these strains in a 30 L pH-controlled stirred tank reactor showed that 2,3-trans-CHD could be obtained in concentrations of up to 4.6 g L(-1). This demonstrates that post-chorismate metabolites are accessible on a preparative scale by using
环己二烯-反式-5,6-二醇,如(S,S)-2,3-二羟基-2,3-二氢苯甲酸(2,3-trans-CHD)已显示出作为手性原料的重要性生物活性物质的合成,特别是石竹的合成。通过使用代谢途径工程方法,克隆了编码异麦芽糖酶和异麦酸合酶的大肠杆菌基因entB和entC,并在缺乏entA的大肠杆菌菌株中过表达,该菌株编码2,3-二羟基苯甲酸酯合酶。相应的EntB / EntC酶活性增加30倍会影响2,3-trans-CHD在培养基中的积累。尽管该菌株在利用分支酸酯的途径中没有向芳香族氨基酸的缺失,但是分支酸酯和任何其他代谢中间体均未被发现为副产物。在30 L pH受控的搅拌釜反应器中发酵这些菌株表明,可以以最高4.6 g L(-1)的浓度获得2,3-trans-CHD。这表明,通过使用代谢途径工程技术,可以在制备规模上获得准巧克力酸盐后的代谢产物。从发酵盐中分离和分离可以经济地通过阴离子交换色谱法一步完成,或者通过反应萃取进行。从2