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Improvement of l-Valine Production by Atmospheric and Room Temperature Plasma Mutagenesis and High-Throughput Screening in Corynebacterium glutamicum.


ABSTRACT: As one of the branched-chain amino acids, l-valine is an essential nutrient for most mammalian species. In this study, the l-valine producer Corynebacterium glutamicum ?ppc?aceE?alat?pqo was first constructed. Additionally, an improved biosensor based on the Lrp-type transcriptional regulator and temperature-sensitive replication was built. Then, the C. glutamicum strain was mutagenized by atmospheric and room temperature plasma. A sequential three-step procedure was carried out to screen l-valine-producing strains, including the fluorescence-activated cell sorting (FACS), 96-well plate screening, and flask fermentation. The final mutant HL2-7 obtained by screening produced 3.20 g/L of l-valine, which was 21.47% higher than the titer produced by the starting strain. This study demonstrates that the l-valine-producing mutants can be successfully isolated based on the Lrp sensor system in combination with FACS screening after random mutagenesis.

SUBMITTER: Han G 

PROVIDER: S-EPMC7081258 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Improvement of l-Valine Production by Atmospheric and Room Temperature Plasma Mutagenesis and High-Throughput Screening in <i>Corynebacterium glutamicum</i>.

Han Guoqiang G   Xu Ning N   Sun Xieping X   Chen Jinzhao J   Chen Chun C   Wang Qing Q  

ACS omega 20200306 10


As one of the branched-chain amino acids, l-valine is an essential nutrient for most mammalian species. In this study, the l-valine producer <i>Corynebacterium glutamicum</i> <i>ΔppcΔaceEΔalatΔpqo</i> was first constructed. Additionally, an improved biosensor based on the Lrp-type transcriptional regulator and temperature-sensitive replication was built. Then, the <i>C. glutamicum</i> strain was mutagenized by atmospheric and room temperature plasma. A sequential three-step procedure was carried  ...[more]

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