兰州大学机构库 >资源环境学院
Anaerobic Mercury Methylation and Demethylation by Geobacter bemidjiensis Bem
Lu, Xia1,2; Liu, Yurong2,3; Johs, Alexander2; Zhao, Linduo2; Wang, TS(王铁山)1; Yang, Ziming2; Lin, Hui2; Elias, Dwayne A.4; Pierce, Eric M.2; Liang, Liyuan2,5; Barkay, Tamar6; Gu, Baohua2
2016
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY   Impact Factor & Quartile
ISSN0013-936X
Volume50Issue:8Pages:4366-4373
AbstractMicrobial methylation and demethylation are two competing processes controlling the net production and bioaccumulation of neurotoxic methylmercury (MeHg) in natural ecosystems. Although mercury (Hg) methylation by anaerobic microorganisms and demethylation by aerobic Hg-resistant bacteria have both been extensively studied, little attention has been given to MeHg degradation by anaerobic bacteria, particularly the iron-reducing bacterium Geobacter bemidjiensis Bern. Here we report, for the first time, that the strain G. bemidjiensis Bern can mediate a suite of Hg transformations, including Hg(II) reduction, Hg(0) oxidation, MeHg production and degradation under anoxic conditions. Results suggest that G. bemidjiensis utilizes a reductive demethylation pathway to degrade MeHg, with elemental Hg(0) as the major reaction product, possibly due to the presence of genes encoding homologues of an organomercurial lyase (MerB) and a mercuric reductase (MerA). In addition, the cells can strongly sorb Hg(II) and MeHg, reduce or oxidize Hg, resulting in both time and concentration-dependent Hg species transformations. Moderate concentrations (10-500 mu M) of Hg-binding ligands such as cysteine enhance Hg(II) methylation but inhibit MeHg degradation. These findings indicate a cycle of Hg methylation and demethylation among anaerobic bacteria, thereby influencing net MeHg production in anoxic water and sediments.
Subject AreaEngineering ; Environmental Sciences & Ecology
PublisherAMER CHEMICAL SOC
DOI10.1021/acs.est.6b00401
Publication PlaceWASHINGTON
Indexed ByEI ; SCIE ; PubMed ; MEDLINE ; BIOSIS
First Inst
Funding Project国家留学基金委项目 ; 美国能源部项目
Project NumberOffice of Biological and Environmental Research, DOE Office of Science, as part of the Mercury Science Focus Area at Oak Ridge National Laboratory (ORNL) ; Chinese Scholarship Council (CSC) of China ; Laboratory Directed RD fund at ORNL
WOS IDWOS:000374707100026
Funding OrganizationCSC ; US DOE
EI Accession Number20162002391193
SubtypeArticle
EI KeywordsAerobic bacteria ; Alkylation ; Amino acids ; Anoxic sediments ; Anoxic water ; Biochemistry ; Biodegradation ; Methylation
EI Classification NumberBioengineering and Biology:461 ; Soil Mechanics and Foundations:483 ; Biochemistry:801.2 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1
Original Document TypeJournal article (JA)
PMID 27019098
BIOSIS IDBCI:BCI201600450995
IRIDWOS:000374707100026
Citation statistics
Cited Times:102[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/181021
Collection资源环境学院
核科学与技术学院
Corresponding AuthorLu, Xia
Affiliation
1.School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China
2.Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge; TN; 37831, United States
3.State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
4.Biosciences Division, Oak Ridge National Laboratory, Oak Ridge; TN; 37831, United States
5.Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge; TN; 37831, United States
6.Department of Biochemistry and Microbiology, Rutgers University, New Brunswick; NJ; 08901, United States
First Author AffilicationSchool of Nuclear Science and Technology
Corresponding Author AffilicationSchool of Nuclear Science and Technology
Recommended Citation
GB/T 7714
Lu, Xia,Liu, Yurong,Johs, Alexander,et al. Anaerobic Mercury Methylation and Demethylation by Geobacter bemidjiensis Bem[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2016,50(8):4366-4373.
APA Lu, Xia.,Liu, Yurong.,Johs, Alexander.,Zhao, Linduo.,Wang, Tieshan.,...&Gu, Baohua.(2016).Anaerobic Mercury Methylation and Demethylation by Geobacter bemidjiensis Bem.ENVIRONMENTAL SCIENCE & TECHNOLOGY,50(8),4366-4373.
MLA Lu, Xia,et al."Anaerobic Mercury Methylation and Demethylation by Geobacter bemidjiensis Bem".ENVIRONMENTAL SCIENCE & TECHNOLOGY 50.8(2016):4366-4373.
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