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Optimization and reconstruction of two new complete degradation pathways for 3-chlorocatechol and 4-chlorocatechol in Escherichia coli

文献类型： 外文期刊

作者： Wang, Bo 1 ; Gao, Jianjie 1 ; Xu, Jing 1 ; Fu, Xiaoyan 1 ; Han, Hongjuan 1 ; Li, Zhenjun 1 ; Wang, Lijuan 1 ; Zhang, Fuji 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Shanghai Key Lab Agr Genet & Breeding, Agrobiotechnol Res Inst, Shanghai, Peoples R China

关键词： Chlorocatechol; Complete degradation pathway; Synthetic biology; Engineered bacteria; Bioremediation

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2021 年 419 卷

页码：

收录情况： SCI

摘要： Chlorinated aromatic compounds are a serious environmental concern because of their widespread occurrence throughout the environment. Although several microorganisms have evolved to gain the ability to degrade chlorinated aromatic compounds and use them as carbon sources, they still cannot meet the diverse needs of pollution remediation. In this study, the degradation pathways for 3-chlorocatechol (3CC) and 4-chlorocatechol (4CC) were successfully reconstructed by the optimization, synthesis, and assembly of functional genes from different strains. The addition of a 13C-labeled substrate and functional analysis of different metabolic modules confirmed that the genetically engineered strains can metabolize chlorocatechol similar to naturally degrading strains. The strain containing either of these artificial pathways can degrade catechol, 3CC, and 4CC completely, although differences in the degradation efficiency may be noted. Proteomic analysis and scanning electron microscopy observation showed that 3CC and 4CC have toxic effects on Escherichia coli, but the engineered bacteria can significantly eliminate these inhibitory effects. As core metabolic pathways for the degradation of chloroaromatics, the two chlorocatechol degradation pathways constructed in this study can be used to construct pollution remediation-engineered bacteria, and the related technologies may be applied to construct complete degradation pathways for complex organic hazardous materials.

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