1. Metabolic engineering of Bacillus subtilis for high-level production of uridine from glucose.
- Author
-
Wang C, Xu J, and Ban R
- Subjects
- Bacterial Proteins genetics, Bacterial Proteins metabolism, Fermentation, Glucose metabolism, Metabolic Engineering methods, Powders metabolism, Subtilisins metabolism, Transferases metabolism, Urea metabolism, Urease metabolism, Uridine metabolism, Aspartate Ammonia-Lyase metabolism, Bacillus subtilis genetics, Bacillus subtilis metabolism
- Abstract
As an intermediate in drug synthesis, uridine has practical applications in the pharmaceutical field. Bacillus subtilis is used as a host to boost uridine yield by manipulating its uridine biosynthesis pathway. In this study, we engineered a high-uridine-producing strain of B. subtilis by modifying its metabolic pathways in vivo. Overexpression of the aspartate ammonia-lyase (ansB) gene increased the relative transcriptional level of ansB in B. subtilis TD320 by 13·18 times and improved uridine production to 15·13 g l
-1 after 72-h fermentation. Overexpression of the putative 6-phosphogluconolactonase (ykgB) gene increased uridine production by the derivative strain TD325 to 15·43 g l-1 . Reducing the translation of the amido phosphoribosyl transferase (purF) gene and inducing expression of the subtilisin E (aprE) gene resulted in a 1·99-fold increase in uridine production after 24 h shaking. Finally, uridine production in the optimal strain B. subtilis TD335, which exhibited reduced urease expression, reached 17·9 g l-1 with a yield of 314 mg of uridine g-1 glucose. To our knowledge, this is the first study to obtain high-yield uridine-producing B. subtilis in a medium containing only three components (80 g l-1 glucose, 20 g l-1 yeast powder, and 20 g l-1 urea)., (© 2022 The Society for Applied Microbiology.)- Published
- 2022
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