Selenite Reduction and the Biogenesis of Selenium Nanoparticles by Alcaligenesfaecalis Se03 Isolated from the Gut of Monochamus alternatus (Coleoptera: Cerambycidae)

International Journal of Molecular Sciences
Yuting WangLifang Wu

Abstract

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 th...Continue Reading

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Citations

Apr 27, 2019·Environmental Microbiology·Jason A RothmanQuinn S McFrederick
Aug 3, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Elena PiacenzaRaymond J Turner
Oct 29, 2020·Proceedings. Biological Sciences·Jason A RothmanPeter Graystock
Feb 23, 2020·Current Opinion in Insect Science·Marion M LemoineMartin Kaltenpoth
Jun 15, 2021·Advanced Healthcare Materials·Cláudio FerroHélder A Santos
Aug 3, 2021·Journal of Hazardous Materials·Dan WangShixue Zheng
Aug 1, 2021·Environmental Science and Pollution Research International·Jayshree AnnamalaiThallada Bhaskar

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Datasets Mentioned

BETA
MG839276

Methods Mentioned

BETA
Transmission
scanning electron microscopy
dynamic light scattering
X-ray
infrared spectroscopy
PCR

Software Mentioned

EzBioCloud
MEGA

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