Manipulating the generation of reactive oxygen species through intermittent hypoxic stress for enhanced accumulation of arachidonic acid-rich lipids
Manipulating the generation of reactive oxygen species through intermittent hypoxic stress for enhanced accumulation of arachidonic acid-rich lipids
复制标题
通过间歇性缺氧应激来控制活性氧的产生,以增强富含花生四烯酸的脂质的积累
DOI:
10.1016/j.ces.2018.04.023
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发表时间:
2018-08
影响因子:
4.7
通讯作者:
Ji Xiao-Jun
中科院分区:
文献类型:
--
作者:
Shi Kun;Gao Zhen;Lin Lu;Wang Wei-Jian;Shi Xin-Qiao;Yu Xiao;Song Ping;Ren Lu-Jing;Huang He;Ji Xiao-Jun
The accumulation of reactive oxygen species (ROS) can induce oxidative damage which can be detrimental to microbial biomass and product yields. In this study, we used intermittent hypoxic stress (IHS) to eliminate the main source of ROS during the production of arachidonic acid (ARA)-rich lipids byMortierella alpina. Biomass, lipid- and ARA concentration simultaneously reached their peak values, and the ARA yield increased by about 20% along with a lower level of ROS concentration. Under these conditions, more NADPH, substrate and energy may be available for lipid biosynthesis. The efficacy of this strategy was also confirmed in a bioreactor, with similar results. Interestingly, the total power required for stirring fell by about 4%, which may be of practical value for energy savings. This work offers new insights into the control of ROS generation inM. alpinaand might be applicable to other microbial PUFAs producers.
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