期刊
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
卷 28, 期 3, 页码 1035-1043出版社
SPRINGER
DOI: 10.1007/s11274-011-0902-4
关键词
Corynebacteria glutamicum; Genome shuffling; L-glutamic acid; Temperature tolerance
资金
- National High Technology Research and Development Program of China [2006AA020301-09]
Genome shuffling was used to improve the thermotolerance of l-glutamic acid-producing strain Corynebacteria glutamicum. Five strains with subtle improvements in high temperature tolerance and productivity were selected by ultraviolet irradiation and diethyl sulfate mutagenesis. An improved strain (F343) was obtained by three rounds of genome shuffling of the five strains as mentioned above. The cell density of F343 was four times higher than that of ancestor strains after 24 h of cultivation at 44A degrees C, and importantly, the yield of l-glutamic acid was increased by 1.8-times comparing with that of the ancestor strain at 38A degrees C in a 5-L fermentor. With glucose supplement and two-stage pH control, the l-glutamate acid concentration of F343 reached 119 g/L after fermentation for 30 h. The genetic diversity between F343 and its ancestors was also evaluated by amplified fragment length polymorphism analysis. Results suggest that the phenotypes for both thermotolerance and l-glutamic acid production in F343 were evolved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据