Abstract
Plasmid-dependent overexpression of enzyme(s) aims to divert carbon flux toward a desired compound. One drawback of this strategy is compromise of growth due to massive consumption of host resources. Here we show that replenishment of sigma factor rpoE improves the growth of Klebsiella pneumoniae. The gene rpoE was expressed alone or coexpressed with Ald4 (an aldehyde dehydrogenase from Saccharomyces cerevisiae) in K. pneumoniae. We found that the Ald4 activity was higher in the strain coexpressing Ald4 and rpoE (32.3 U/mg) than that expressing Ald4 alone (29.9 U/mg). Additionally, under shake-flask conditions, the strain coexpressing Ald4 and rpoE produced 0.5 g 3-hydroxypropionic acid (3-HP) and 9.8 g 1,3-propanediol (1,3-PD) per liter in 24 h, which were 1.6- and 0.85-fold enhancement, respectively, compared to those expressing Ald4 alone. Notably, under non-optimized bioreactor conditions, the strain coexpressing Ald4 and rpoE produced 13.5 g 3-HP and 37.8 g 1,3-PD per liter with glycerol conversion ratio of 0.45 mol/mol. These results indicate that replenishment of rpoE enhanced promoter activity and stimulated glycerol consumption.
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This work was supported by grants from National Basic Research Program of China (973 Program) (2012CB725200), National High Technology Research and Development Program (863 Program) (No. 2015AA021003), National Natural Science Foundation of China (Nos. 21276014, 21476011), and the Fundamental Research Funds for the Central Universities (YS1407).
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Chen, L., Li, Y. & Tian, P. Enhanced Promoter Activity by Replenishment of Sigma Factor rpoE in Klebsiella pneumoniae . Indian J Microbiol 56, 190–197 (2016). https://doi.org/10.1007/s12088-016-0576-6
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DOI: https://doi.org/10.1007/s12088-016-0576-6