A metagenomics study of hexabromocyclododecane degradation with a soil microbial community

基因组 环境化学 微生物种群生物学 六溴环十二烷 微生物降解 化学 鞘脂单胞菌属 生物转化 污染物 生物降解 环境修复 微生物 生物 生态学 污染 细菌 生物化学 有机化学 基因 阻燃剂 遗传学 16S核糖体RNA
作者
Yijie Li,Chia-Hsien Chuang,Wen‐Chih Cheng,Shu‐Hwa Chen,Wenling Chen,Yu‐Jie Lin,Chung‐Yen Lin,Yang‐hsin Shih
出处
期刊:Journal of Hazardous Materials [Elsevier]
卷期号:430: 128465-128465 被引量:22
标识
DOI:10.1016/j.jhazmat.2022.128465
摘要

Hexabromocyclododecanes (HBCDs) are globally prevalent and persistent organic pollutants (POPs) listed by the Stockholm Convention in 2013. They have been detected in many environmental media from waterbodies to Plantae and even in the human body. Due to their highly bioaccumulative characterization, they pose an urgent public health issue. Here, we demonstrate that the indigenous microbial community in the agricultural soil in Taiwan could decompose HBCDs with no additional carbon source incentive. The degradation kinetics reached 0.173 day-1 after the first treatment and 0.104 day-1 after second exposure. With additional C-sources, the rate constants decreased to 0.054-0.097 day-1. The hydroxylic debromination metabolites and ring cleavage long-chain alkane metabolites were identified to support the potential metabolic pathways utilized by the soil microbial communities. The metagenome established by Nanopore sequencing showed significant compositional alteration in the soil microbial community after the HBCD treatment. After ranking, comparing relative abundances, and performing network analyses, several novel bacterial taxa were identified to contribute to HBCD biotransformation, including Herbaspirillum, Sphingomonas, Brevundimonas, Azospirillum, Caulobacter, and Microvirga, through halogenated / aromatic compound degradation, glutathione-S-transferase, and hydrolase activity. We present a compelling and applicable approach combining metagenomics research, degradation kinetics, and metabolomics strategies, which allowed us to decipher the natural attenuation and remediation mechanisms of HBCDs.
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