Abstract
2-Keto-d-gluconic acid (2KGA) is mainly used for industrial production of erythorbic acid, a food antioxidant. In this study, a 2KGA producing strain JUIM02 was firstly identified as Arthrobacter globiformis by morphological observation and 16S rDNA sequencing. The 2KGA synthetic capacity of A. globiformis JUIM02 was evaluated by both fermentation and bioconversion, with 180 g/L dextrose monohydrate as substrates, in shake flasks and 5 L fermenters. For fermentation, 2KGA titer, yield, molar yield, and productivity of JUIM02 reached 159.05 g/L, 0.97 g/g, 90.18%, and 6.63 g/L/h in 24 h. For non-sterile and buffer-free bioconversion by free resting cells (~ 3.2 g/L dry cell weight) of JUIM02, these data were 172.96 g/L, 1.06 g/g, 98.07%, and 5.41 g/L/h in 32 h. Moreover, JUIM02 resting cells could be repeatedly used. Resting cells stored at 4 °C within 30 days showed stable bioconversion capacity, with 2KGA titers ≥ 171.50 g/L, yields ≥ 1.04 g/g, and molar yields ≥ 97.24%. The 2KGA synthetic pathway in A. globiformis, which was rarely reported, was also speculated similar to Pseudomonas and verified preliminarily. In conclusion, A. globiformis JUIM02 is a promising 2KGA industrial-producing strain suitable for various production methods and a suitable object for 2KGA metabolism research of A. globiformis.
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Acknowledgements
This work was supported by funding from National Natural Science Foundation of China (31571885), National High-tech R&D Program (863 Program) (2012AA022103), and Science and Technology Program of Jiangxi Province (No. [2015] 64).
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Sun, L., Sun, W., Wang, D. et al. A Novel 2-Keto-d-Gluconic Acid High-Producing Strain Arthrobacter globiformis JUIM02. Appl Biochem Biotechnol 185, 947–957 (2018). https://doi.org/10.1007/s12010-018-2707-5
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DOI: https://doi.org/10.1007/s12010-018-2707-5