Detoxification of selenite and mercury by reduction and mutual protection in the assimilation of both elements by Pseudomonas fluorescens

The Science of the Total Environment
Nelson BelzileVasu D Appanna

Abstract

A study on the assimilation and detoxification of selenium and mercury and on the interaction between these two elements was conducted on Pseudomonas fluorescens. P. fluorescens was able to convert separately both elements to their elemental forms, which are less toxic and biologically less available. To study the converting mechanism of selenite to elemental Se, cells were grown in the presence of various selenite concentrations and several parameters such as extracellular protein concentrations, pH, carbohydrate concentrations, isocitrate dehydrogenase (ICDH) and malic enzyme were monitored. Transmission electron microscopy (TEM) and various analytical methods were applied to confirm the interaction between selenium and cell. The former appeared as a red precipitate localized predominantly in the consumed culture medium. P. fluorescens also resisted to the toxic effect of mercury by converting Hg2+ to the volatile and less toxic form Hg0. Mercury reductase was likely responsible for the conversion of Hg2+ to Hg0. More importantly, the interaction between mercury and selenium was also studied. The presence of selenite significantly reduced the accumulation of mercury in P. fluorescens. It was also interesting to note that merc...Continue Reading

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Citations

Jul 7, 2010·Microbial Cell Factories·Soniya Dhanjal, Swaranjit Singh Cameotra
Nov 9, 2010·Applied and Environmental Microbiology·Tatiana A VishnivetskayaDwayne A Elias
Nov 28, 2012·Applied Biochemistry and Biotechnology·Arvind SinhaSunil Kumar Khare
Sep 10, 2015·Environmental Science and Pollution Research International·Rohan JainPiet N L Lens
Jan 7, 2016·Frontiers in Molecular Biosciences·Helen A VrionisRaymond J Turner
Dec 5, 2014·Environmental Science and Pollution Research International·Yongzhen DingRenwei Feng
Jul 19, 2016·Integrated Environmental Assessment and Management·Gary N BighamElizabeth A Henry
Sep 30, 2016·Scientific Reports·Zuzana GajdosechovaEva M Krupp
Jan 4, 2017·Geobiology·C E RosenfeldC M Santelli
Jan 27, 2017·Frontiers in Plant Science·Meetu Gupta, Shikha Gupta
Apr 20, 2019·Environmental Science and Pollution Research International·Shalini Singh, Vipin Kumar
Feb 15, 2011·The Science of the Total Environment·Dan-Yi YangNelson Belzile
May 13, 2011·Journal of Proteome Research·Sean C BoothAalim M Weljie
Oct 8, 2021·Bulletin of Environmental Contamination and Toxicology·Zhen WangFei Pang

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