1. Enhanced production of <scp>d</scp> ‐psicose 3‐epimerase in Bacillus subtilis by regulation of segmented fermentation
- Author
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Gang Fu, Ran Tu, Huina Dong, Jingqi Chen, Shibin Zhang, and Dawei Zhang
- Subjects
0106 biological sciences ,Psicose ,Racemases and Epimerases ,Biomedical Engineering ,Bioengineering ,Fructose ,Bacillus subtilis ,01 natural sciences ,Applied Microbiology and Biotechnology ,Industrial Microbiology ,03 medical and health sciences ,chemistry.chemical_compound ,010608 biotechnology ,Drug Discovery ,Food science ,030304 developmental biology ,chemistry.chemical_classification ,Ruminococcus sp ,0303 health sciences ,biology ,Process Chemistry and Technology ,General Medicine ,Hydrogen-Ion Concentration ,biology.organism_classification ,Enzyme ,chemistry ,Ph regulation ,Fermentation ,Molecular Medicine ,Biotechnology - Abstract
d-Psicose 3-epimerase is an enzyme that catalyzes the synthesis of d-psicose from d-fructose. We cloned the d-psicose 3-epimerase from Ruminococcus sp. (RDPE) and expressed it in Bacillus subtilis A311. By a two-step pH regulation of segmented fermentation, we significantly improved the RDPE production and decreased the fermentation cost. The two-step regulation consisted of the first step maintained the pH value at 7.0 for 24 H and the second step adjusted the pH value up to 7.5 slowly for another 24 H. Finally, the RDPE production was increased to 74 U/mL, which was about 2.5-fold compared with the control. Our segmented fermentation strategy provides an important experimental basis for the industrial-scale production of RDPE.
- Published
- 2019