数字农科院2.0

Elimination of editing plasmid mediated by theophylline riboswitch in Zymomonas mobilis

文献类型： 外文期刊

作者： Huang, Yuhuan;Chen, Mao;Hu, Guoquan;Wu, Bo;He, Mingxiong

作者机构：

关键词： Elimination of editing plasmid;Theophylline-dependent riboswitch;CRISPR-Cas system;Zymomonas mobilis

期刊名称： APPLIED MICROBIOLOGY AND BIOTECHNOLOGY

ISSN： 0175-7598

年卷期： 2023 年

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： Zymomonas mobilis is regarded as a potential chassis for the production of platform chemicals. Genome editing using the CRISPR-Cas system could meet the need for gene modification in metabolic engineering. However, the low curing efficiency of CRISPR editing plasmid is a common bottleneck in Z. mobilis. In this study, we utilized a theophylline-dependent riboswitch to regulate the expression of the replicase gene of the editing plasmid, thereby promoting the elimination of exogeneous plasmid. The riboswitch D (RSD) with rigorous regulatory ability was identified as the optimal candidate by comparing the transformation efficiency of four theophylline riboswitch-based backbone editing plasmids, and the optimal theophylline concentration for inducing RSD was determined to be 2 mM. A highly effective method for eliminating the editing plasmid, cells with RSD-based editing plasmid which were cultured in liquid and solid RM media in alternating passages at 37 degrees C without shaking, was established by testing the curing efficiency of backbone editing plasmids pMini and pMini-RSD in RM medium with or without theophylline at 30 degrees C or 37 degrees C. Finally, the RSD-based editing plasmid was applied to genome editing, resulting in an increase of more than 10% in plasmid elimination efficiency compared to that of pMini-based editing plasmid.

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