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Effects of transcriptional mode on promoter substitution and tandem engineering for the production of epothilones in Myxococcus xanthus.


ABSTRACT: Promoter optimization is an economical and effective approach to overexpress heterologous genes and improve the biosynthesis of valuable products. In this study, we swapped the original promoter of the epothilone biosynthetic gene cluster in Myxococcus xanthus with two endogenous strong promoters P pilA and P groEL1 , respectively, which, however, decreased the epothilone production ability. The transcriptional abilities by the two promoters were found to be bloomed in the growth stage but markedly decreased after the growth, whereas the original promoter P epo functioned majorly after the exponential growth stage. Tandem repeat engineering on the original promoter P epo remarkably increased epothilone production. The tandem promoter exerted similar expressional pattern as P epo did in M. xanthus. We demonstrated that differential transcriptional modes markedly affected the efficiency of promoters in controlling the gene expressions for the production of the secondary metabolite epothilones. Our study provides an insight into exploiting powerful promoters to produce valuable secondary metabolites, especially in host with limited known promoters.

SUBMITTER: Yue XJ 

PROVIDER: S-EPMC5999154 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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Effects of transcriptional mode on promoter substitution and tandem engineering for the production of epothilones in Myxococcus xanthus.

Yue Xin-Jing XJ   Cui Xiao-Wen XW   Zhang Zheng Z   Hu Wei-Feng WF   Li Zhi-Feng ZF   Zhang You-Ming YM   Li Yue-Zhong YZ  

Applied microbiology and biotechnology 20180428 13


Promoter optimization is an economical and effective approach to overexpress heterologous genes and improve the biosynthesis of valuable products. In this study, we swapped the original promoter of the epothilone biosynthetic gene cluster in Myxococcus xanthus with two endogenous strong promoters P <sub>pilA</sub> and P <sub>groEL1</sub> , respectively, which, however, decreased the epothilone production ability. The transcriptional abilities by the two promoters were found to be bloomed in the  ...[more]

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