Genetic replacement of tesB with PTE1 affects chain-length proportions of 3-hydroxyalkanoic acids produced through β-oxidation of oleic acid in Escherichia coli
作者:Yoshiaki Seto、Junkyu Kang、Li Ming、Naoto Habu、Ken-ichi Nihei、Shunsaku Ueda、Isamu Maeda
DOI:10.1016/j.jbiosc.2010.05.004
日期:2010.10
3-hydroxybutyric acid, 3-hydroxyhexanoic acid, 3-hydroxyoctanoic acid, and hexanoic acid in medium after cultivation with oleic acid as a sole carbon source. Hexanoic acid concentration was much lower than those of 3-hydroxyacids. In genetic complementation of tesB deletion, use of PTE1, instead of tesB, affected proportions of the 3-hydroxyalkanoic acids. Proportion of 3-hydroxybutyric acid was higher in
酰基辅酶A硫酯酶II(TesB),其催化酰基辅酶A水解成游离脂肪酸和辅酶A,参与大肠杆菌中3-羟基链烷酸的生产。遗传更换的影响TESB与酿酒酵母酰基辅酶A硫酯酶基因PTE1检查通过β氧化的3-羟基烷酸的生产从油酸。使用β-氧化中间体的动力学分析表明,PTE1水解C4-酰基底物比TesB更有效。的缺失TESB在大肠杆菌以油酸为唯一碳源培养后,培养基中的3-羟基丁酸,3-羟基己酸,3-羟基辛酸和己酸含量降低。己酸浓度远低于3-羟基酸。在tesB缺失的遗传互补中,使用PTE1代替tesB会影响3-羟基链烷酸的比例。的3-羟基丁酸比例更高以PTE1 -complemented应变比在TESB -complemented应变,而3-羟基己酸和3-羟基辛酸比例显着增加在TESB -complemented应变。3-羟基辛酸的比例没有明显增加。PTE1互补菌株。这些数据表明通过β-氧化从油酸生产3-羟基