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Citation
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HERO ID
3717398
Reference Type
Journal Article
Title
Promotion of iron oxide reduction and extracellular electron transfer in Shewanella oneidensis by DMSO
Author(s)
Cheng, YY; Li, BB; Li, DB; Chen, JJ; Li, WW; Tong, ZH; Wu, C; Yu, HQ
Year
2013
Is Peer Reviewed?
1
Journal
PLoS ONE
EISSN:
1932-6203
Volume
8
Issue
11
Page Numbers
e78466
Language
English
PMID
24244312
DOI
10.1371/journal.pone.0078466
Web of Science Id
WOS:000327162900017
Abstract
The dissimilatory metal reducing bacterium Shewanella oneidensis MR-1, known for its capacity of reducing iron and manganese oxides, has great environmental impacts. The iron oxides reducing process is affected by the coexistence of alternative electron acceptors in the environment, while investigation into it is limited so far. In this work, the impact of dimethyl sulphoxide (DMSO), a ubiquitous chemical in marine environment, on the reduction of hydrous ferric oxide (HFO) by S. oneidensis MR-1 was investigated. Results show that DMSO promoted HFO reduction by both wild type and ΔdmsE, but had no effect on the HFO reduction by ΔdmsB, indicating that such a promotion was dependent on the DMSO respiration. With the DMSO dosing, the levels of extracellular flavins and omcA expression were significantly increased in WT and further increased in ΔdmsE. Bioelectrochemical analysis show that DMSO also promoted the extracellular electron transfer of WT and ΔdmsE. These results demonstrate that DMSO could stimulate the HFO reduction through metabolic and genetic regulation in S. oneidensis MR-1, rather than compete for electrons with HFO. This may provide a potential respiratory pathway to enhance the microbial electron flows for environmental and engineering applications.
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