Journal
BIORESOURCE TECHNOLOGY
Volume 361, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127686
Keywords
Bioremediation; Electron migration capacity; Extracellular respiratory bacteria; Two -component systems; Gene expression
Funding
- Shanghai Natural Science Foundation [22ZR1466900]
- National Key Research and Develop-ment Program of China [2019YFC1906302]
- China Postdoctoral Science Foundation [2021M692423]
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This study found that Cu NPs exposure significantly enhanced the Cr(VI) reduction efficiency of Shewanella oneidensis MR-1. Cu NPs can influence the bacterial Cr(VI) reduction ability by enhancing electron migration capacity and regulating the expression of key genes.
The bioreduction of hexavalent chromium (Cr(VI)) depends highly on bacterial activity, while the release of copper nanoparticles (Cu NPs) poses threats to microorganisms in the environment. This work demonstrated that Cr(VI) reduction efficiency of Shewanella oneidensis MR-1 was remarkably enhanced by 83.7% under 20 mg/L Cu NPs exposure. Cu NPs improved the electron migration capacity of Shewanella oneidensis MR-1 by enhancing bioelectrochemical performance and flavin mononucleotide secretion. Moreover, key genes related to extracellular electron transfer pathways, including direct electron transfer through outer-membrane proteins, flavinmediated electron transfer, and conductive flagella, were generally upregulated under Cu NPs exposure. In addition, environmental adaptability of Shewanella oneidensis MR-1 was enhanced under Cu NPs exposure by improving environmental information processing and energy and reducing power production, promoting Cr(VI) reduction by Shewanella oneidensis MR-1. This work indicated that Cu NPs could enhance Cr(VI) reduction by Shewanella oneidensis MR-1 through regulating extracellular electron transfer and environmental adaptability.
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