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Genome shuffling improves thermotolerance and glutamic acid production of Corynebacteria glutamicum

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Abstract

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 44°C, and importantly, the yield of l-glutamic acid was increased by 1.8-times comparing with that of the ancestor strain at 38°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.

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Acknowledgments

This work was supported by grants from the National High Technology Research and Development Program of China (No. 2006AA020301-09).

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Authors and Affiliations

  1. The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, People’s Republic of China

    Pu Zheng, Miao Liu, Xiao-de Liu, Qiao-yan Du, Ye Ni & Zhi-hao Sun

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  1. Pu Zheng
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  2. Miao Liu
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  3. Xiao-de Liu
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Correspondence to Zhi-hao Sun.

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Zheng, P., Liu, M., Liu, Xd. et al. Genome shuffling improves thermotolerance and glutamic acid production of Corynebacteria glutamicum . World J Microbiol Biotechnol 28, 1035–1043 (2012). https://doi.org/10.1007/s11274-011-0902-4

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