Characterization of Arsenic Biotransformation by a Typical Bryophyte Physcomitrella patens

文献类型： 外文期刊

第一作者： Yin, Xixiang

作者： Yin, Xixiang;Liu, Yifei;Jiang, Tenglong;Yin, Xixiang;Wang, Lihong;Gao, Jianwei

作者机构：

关键词： Arsenic;Accumulation;Biotransformation;Physcomitrella patens

期刊名称：BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：2.151； 五年影响因子：2.129 ）

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收录情况： SCI

摘要： Arsenic (As) is a ubiquitous environmental toxin that has created catastrophic human health and environmental problems around world. Physcomitrella patens is a potential model plant for the study of environmental monitoring, which exists in all kinds of ecosystems. In this study, arsenic metabolism was investigated by this moss. When supplied with different levels of arsenate (50, 100, 200 A mu mol/L) for a 4-week period, the total arsenic concentrations were up to 231.4-565.4 mg/kg DW in this moss. Arsenite concentration increased with increasing external arsenate concentrations, the proportion was up to 25.1-36.8% of the total As. An arsenate reductase, PpACR2, was identified and functionally characterized. Heterologous expression of PpACR2 in an As(V)-sensitive strain WC3110 (Delta arsC) of Escherichia coli conferred As(V) resistance. Purified PpACR2 protein exhibited the arsenate reductase activity. Given its powerful As accumulation ability, the bryophyte could be exploited in bioremediation of As-contaminated environments.

分类号： R99

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