2016 ; Vol.26-6: 1148~1161
|Author||Yahui Gong, Tiyuan Li, Shiyu Li, Zhenyou Jiang, Yan Yang, Junli Huang, Zhaobing Liu, Hanxiao Sun|
|Place of duty||Institute of Genomic Medicine, College of Pharmacy, Jinan University, Guangzhou 510632, P.R. China|
|Title||Achieving High Yield of Lactic Acid for Antimicrobial Characterization in Cephalosporin-Resistant Lactobacillus by the Co-Expression of the Phosphofructokinase and Glucokinase|
J. Microbiol. Biotechnol.2016 ;
|Abstract||Lactobacilli are universally recognized as probiotics that are widely used in the adjuvant
treatment of inflammatory diseases, such as vaginitis and enteritis. With the overuse of
antibiotics in recent years, the lactobacilli in the human body are killed, which could disrupt
the microecological balance in the human body and affect health adversely. In this work,
cephalosporin-resistant Lactobacillus casei RL20 was obtained successfully from the feces of
healthy volunteers, which possessed a stable genetic set. However, the shortage of lactic acid
(72.0 g/l at 48 h) by fermentation did not meet the requirement for its use in medicine. To
increase the production of lactic acid, the functional genes pfk and glk were introduced into the
wild strain. A yield of 144.2 g/l lactic acid was obtained in the transgenic L. casei RL20-2 after
fermentation for 48 h in 1 L of basic fermentation medium with an initial glucose
concentration of 100 g/l and increasing antibacterial activity. These data suggested that L. casei
RL20-2 that exhibited a high yield of lactic acid may be a potential probiotic to inhibit the
spread of bacterial infectious diseases and may be used for vaginitis therapy.|
|Key_word||antibacterial activity, cephalosporin resistance, lactic acid, Lactobacillus casei, microarray|
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