Abstract
Our previous research had revealed that the dissolved oxygen limitation was more favorable for vitamin B12 fermentation, due to its inducement to the increased glycolytic flux in Pseudomonas denitrificans. In this paper, a novel strategy was implemented to further investigate the metabolic characteristics of P. denitrificans under different oxygen supply levels, by exogenously adding rotenone (a respiratory chain inhibitor interfering with the oxygen consumption) to the fermentation broths. Compared to the fermentation process without rotenone treatment, it was observed that 5 mg/L rotenone treatment could significantly strengthen the glycolytic flux of P. denitrificans via activating the key glycolytic enzymes (phosphofructokinase and pyruvate kinase), resulting in the accelerated generations of anterior precursors (glutamate and 5-aminolevulinic acid) for vitamin B12 biosynthesis. Although 5 mg/L rotenone treatment had a negative effect on cell growth of P. denitrificans, the vitamin B12 yield was increased from 48.28 ± 0.62 mg/L to 54.70 ± 0.45 mg/L, which further proved that an increased glycolytic flux in P. denitrificans was a consequence of higher vitamin B12 production.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant No. 31060009), the Natural Science Foundation of Jiangxi Province (Grant No. 2010GQN0062), and School Foundation of JXAU (No. 2008-2519). We are grateful to the editor and the anonymous reviewers for their comments.
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Cheng, X., Chen, W., Peng, Wf. et al. Improved Vitamin B12 Fermentation Process by Adding Rotenone to Regulate the Metabolism of Pseudomonas denitrificans . Appl Biochem Biotechnol 173, 673–681 (2014). https://doi.org/10.1007/s12010-014-0878-2
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DOI: https://doi.org/10.1007/s12010-014-0878-2