Abstract
Exogenous addition of a low concentration of acetate (2 g/L sodium acetate) effectively decreased acetic acid excretion and lowered the ATP content in Sporolactobacillus sp. Y2-8 without any growth defect although the acetate could not be utilized at an initial glucose concentration of 150 g/L. This induced an enhanced glycolytic flux with increased specific activities of hexokinase and phosphofructokinase, probably to compensate for the lowered efficiency of ATP production. However, with increasing concentrations (5 g/L sodium acetate), acetate was utilized first before being produced again, causing a growth lag at the transition. Glucose consumption was also reduced at high acetate concentrations, resulting in decreased d-lactic acid production. These results demonstrate that acetate plays a significant role in regulating glycolysis and growth of Sporolactobacillus.
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Acknowledgments
This work was supported by a grant from the National Outstanding Youth Foundation of China (Grant No.: 21025625); the National High-Tech Research and Development Program of China (863) (Grant No.: 2012AA021203); the National Basic Research Program of China (973) (Grant No.: 2011CBA00806); the National Natural Science Foundation of China, Youth Program (Grant No.:21106070); the Changjiang Scholars and Innovative in University (PCSIRT), and Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Dong Liu and Yong Chen equally contributed to this study.
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Liu, D., Chen, Y., Li, A. et al. Adaptation of Glycolysis and Growth to Acetate in Sporolactobacillus sp. Y2-8. Appl Biochem Biotechnol 168, 455–463 (2012). https://doi.org/10.1007/s12010-012-9789-2
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DOI: https://doi.org/10.1007/s12010-012-9789-2