Selenite Reduction and the Biogenesis of Selenium Nanoparticles by Alcaligenes faecalis Se03 Isolated from the Gut of Monochamus alternatus (Coleoptera: Cerambycidae)
文献类型： 外文期刊
作者： Wang, Yuting 1 ; Shu, Xian 1 ; Zhou, Qing 1 ; Fan, Tao 3 ; Wang, Taichu 3 ; Chen, Xue 1 ; Li, Minghao 1 ; Ma, Yuhan 1 ; Ni, 1 ;
作者机构： 1.Chinese Acad Sci, Hefei Inst Phys Sci, Key Lab High Magnet Field & Ion Beam Phys Biol, Hefei 230031, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Life Sci, Hefei 230026, Anhui, Peoples R China
3.Anhui Acad Agr Sci, Sericultural Res Inst, Hefei 230061, Anhui, Peoples R China
4.Chinese Acad Sci, Hefei Inst Phys Sci, Key Lab Environm Toxicol & Pollut Control Technol, Hefei 230031, Anhui, Peoples R China
关键词： selenite reduction; Alcaligenes faecalis; biogenic seleniumnanoparticles; electronmicroscopy analysis; real-time PCR
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）
ISSN： 1422-0067
年卷期： 2018 年 19 卷 9 期
页码：
收录情况： SCI
摘要： In this study, a bacterial strain exhibiting high selenite (Na2SeO3) tolerance and reduction capacity was isolated from the gut of Monochamus alternatus larvae and identified as Alcaligenes faecalis Se03. The isolate exhibited extreme tolerance to selenite (up to 120 mM) when grown aerobically. In the liquid culture medium, it was capable of reducing nearly 100% of 1.0 and 5.0 mM Na2SeO3 within 24 and 42 h, respectively, leading to the formation of selenium nanoparticles (SeNPs). Electron microscopy and energy dispersive X-ray analysis demonstrated that A. faecalis Se03 produced spherical electron-dense SeNPs with an average hydrodynamic diameter of 273.8 +/- 16.9 nm, localized mainly in the extracellular space. In vitro selenite reduction activity and real-time PCR indicated that proteins such as sulfite reductase and thioredoxin reductase present in the cytoplasm were likely to be involved in selenite reduction and the SeNPs synthesis process in the presence of NADPH or NADH as electron donors. Finally, using Fourier-transform infrared spectrometry, protein and lipid residues were detected on the surface of the biogenic SeNPs. Based on these observations, A. faecalis Se03 has the potential to be an eco-friendly candidate for the bioremediation of selenium-contaminated soil/water and a bacterial catalyst for the biogenesis of SeNPs.
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