Microbial transformations of selenite by methane-oxidizing bacteria

被引:0
作者
Abdurrahman S. Eswayah
Thomas J. Smith
Andreas C. Scheinost
Nicole Hondow
Philip H. E. Gardiner
机构
[1] Sheffield Hallam University,Biomolecular Sciences Research Centre
[2] Biotechnology Research Centre,Institute of Resource Ecology
[3] The Rossendorf Beamline at ESRF,School of Chemical and Process Engineering
[4] Helmholtz Zentrum Dresden Rossendorf,undefined
[5] University of Leeds,undefined
来源
Applied Microbiology and Biotechnology | 2017年 / 101卷
关键词
Methane-oxidizing bacteria; Microbial transformation; Selenite; Elemental selenium; Bioremediation;
D O I
暂无
中图分类号
学科分类号
摘要
Methane-oxidizing bacteria are well known for their role in the global methane cycle and their potential for microbial transformation of wide range of hydrocarbon and chlorinated hydrocarbon pollution. Recently, it has also emerged that methane-oxidizing bacteria interact with inorganic pollutants in the environment. Here, we report what we believe to be the first study of the interaction of pure strains of methane-oxidizing bacteria with selenite. Results indicate that the commonly used laboratory model strains of methane-oxidizing bacteria, Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b, are both able to reduce the toxic selenite (SeO32−) but not selenate (SeO42−) to red spherical nanoparticulate elemental selenium (Se0), which was characterized via energy-dispersive X-ray spectroscopy (EDXS), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). The cultures also produced volatile selenium-containing species, which suggests that both strains may have an additional activity that can transform either Se0 or selenite into volatile methylated forms of selenium. Transmission electron microscopy (TEM) measurements and experiments with the cell fractions cytoplasm, cell wall and cell membrane show that the nanoparticles are formed mainly on the cell wall. Collectively, these results are promising for the use of methane-oxidizing bacteria for bioremediation or suggest possible uses in the production of selenium nanoparticles for biotechnology.
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页码:6713 / 6724
页数:11
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