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Construction of an Escherichia coli strain to degrade phenol completely with two modified metabolic modules

文献类型： 外文期刊

作者： Wang, Bo 1 ; Xu, Jing 1 ; Gao, Jianjie 1 ; Fu, Xiaoyan 1 ; Han, Hongjuan 1 ; Li, Zhenjun 1 ; Wang, Lijuan 1 ; Tian, Yongs 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： Phenol; Complete degradation; Metabolic module; Artificial gene cluster; 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： 2019 年 373 卷

页码：

收录情况： SCI

摘要： Phenol is a common water pollutant because of its broad industrial applications. Biological method is a promising alternative to conventional physical and chemical methods for removing this toxic pollutant from the environment. In this study, two metabolic modules were introduced into Escherichia coli, the widely used host for various genetic manipulations, to elucidate the metabolic capacity of E. coli for phenol degradation. The first module catalysed the conversion of phenol to catechol, whereas the second module cleaved catechol into the three carboxylic acid circulating intermediates by the ortho-cleavage pathway. Phenol was completely degraded and imported into the tricarboxylic acid cycle by the engineered bacteria. Proteomics analysis showed that all genes in the phenol degradation pathway were over-expressed and affected cell division and energy metabolism of the host cells. Phenol in coking wastewater was degraded powerfully by BL-phe/cat. The engineered E. coli can improve the removal rate and shorten the processing time for phenol removal and has considerable potential in the treatment of toxic and harmful pollutants.

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