生物降解
生物修复
邻苯二甲酸盐
根际
突变体
化学
基因
双加氧酶
基因组
生物化学
细菌
微生物学
生物
遗传学
有机化学
作者
Nai-Xian Feng,Fei Zhang,Yunchang Xie,Hui Bu,Lei Xiang,Yanwen Li,Fantao Zhang,Yunhong Huang,Hai-Ming Zhao,Quan-Ying Cai,Mo Chen,Qing X. Li
标识
DOI:10.1016/j.scitotenv.2022.161013
摘要
Phthalates (PAEs) are ubiquitous in soils and food products and thus pose a high risk to human health. Herein, genome mining revealed a great diversity of bacteria with PAEs-degrading potential. Mining of the genome of Raoultella ornithinolytica XF201, a novel strain isolated from Dongxiang wild rice rhizosphere, revealed the presence of two silenced tandem genes pcdGH (encoding protocatechuate 3,4-dioxygenase, 3,4-PCD), key aromatic ring-cleaving genes in PAEs biodegradation. Ribosome engineering was successfully utilized to activate the expression of pcdGH genes to produce 3,4-PCD in the mutant XF201-G2U5. The mutant XF201-G2U5 showed high 3,4-PCD activity and could remove 94.5 % of di-n butyl phthalate (DBP) in 72 h. The degradation kinetics obeyed the first-order kinetic model. Strain XF201-G2U5 could also degrade the other PAEs and the main intermediate metabolites, ultimately leading to tricarboxylic acid cycle. Therefore, this strategy facilitates novel bacterial resources discovery for bioremediation of PAEs and other emerging contaminants.
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