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论文类型：期刊论文

发表时间：2022-06-30

发表刊物：Chinese Journal of Applied and Environmental Biology

卷号：23

期号：3

页面范围：579-585

ISSN号：1006-687X

关键字："selenium; microorganism; selenate reductase; enzymatical pathway; Se nanoparticle"

CN号：51-1482/Q

摘要：Selenium (Se) is one of the most important elements in nature. Microorganisms play a crucial role in its biogeochemical cycling. There have been several reports on Se (VI) and Se (IV) reduction to Se nanoparticles (SeNPs) via microbial assimilation reduction, alienation reduction, and others pathways in bacteria, fungi, and actinomycetes. This paper reviews the microorganisms that can reduce Se (VI) and Se (IV), the mechanisms by which they reduce Se, and proteins that may play roles in transporting Se compounds, controlling their particles sizes, and stabilizing SeNPs. Reduction of Se (VI) is mediated by selenate reductase, whereas the reduction of Se (VI) is mediated by enzymatic pathways such as sulfte reductase, nitrite reductase, glutathione and glutathione reductase, thioredoxin and thioredoxin reductase, nonenzymatic pathways, and cellular respiration using Se (VI) as electron acceptors. Some microbes use several pathways simultaneously. Many different enzymes and other proteins play important roles in the transport of Se compounds, control of particle sizes, and stabilization and efflux of SeNPs, which may change the physical and chemical properties of SeNPs by controlling the process of reducing Se compounds, thereby affect the fate of Se in the environment. Therefore, identifying new microbial resources and using multiple omics tools, including genomics, transcriptomics, and proteomics to analyze key genes and regulate systems related to the transformation of Se compounds will be important future research directions.

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