Stabilization and improved activity of arachidonate 11S-lipoxygenase from proteobacterium Myxococcus xanthus
作者:Jung-Ung An、Deok-Kun Oh
DOI:10.1194/jlr.m088823
日期:2018.11
Lipoxygenases (LOXs) catalyze the dioxygenation of PUFAs to produce regio- and stereospecific oxygenated fatty acids. The identification of regio- and stereospecific LOXs is important because their specific products are involved in different physiological activities in various organisms. Bacterial LOXs are found only in some proteobacteria and cyanobacteria, and they are not stable in vitro. Here,
脂加氧酶(LOX)催化PUFA的双加氧反应,生成区域和立体特异性的含氧脂肪酸。区域特异性和立体特异性LOX的鉴定很重要,因为它们的特定产物参与了各种生物体的不同生理活动。细菌LOX仅在某些蛋白细菌和蓝细菌中发现,它们在体外不稳定。在这里,我们使用了C20和C22 PUFA(如花生四烯酸(ARA),二十碳五烯酸和二十二碳六烯酸)来鉴定来自变形杆菌Xanthus的11S特异性LOX,并探索其体外稳定性和活性。添加磷脂酰胆碱,Ca 2+可以显着提高黄花木兰ARA 11S-LOX的活性和稳定性,以及从ARA生产11S-羟基二十碳四烯酸的能力。肌动蛋白样蛋白(在酵母红假单胞菌甲苯胺中新发现)是刺激因子;实际上,在所有这三个因素的存在下,LOX活性大约增加了3倍。我们的结果表明,这些刺激因子可用于增加细菌LOX的活性和稳定性以及生物活性羟基脂肪酸的产生,这可为新的学术研究做出贡献。