{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T17:16:42Z","timestamp":1790702202821,"version":"4.1.0"},"reference-count":57,"publisher":"American Chemical Society (ACS)","issue":"18","license":[{"start":{"date-parts":[[2017,8,29]],"date-time":"2017-08-29T00:00:00Z","timestamp":1503964800000},"content-version":"vor","delay-in-days":15,"URL":"https:\/\/pubs.acs.org\/page\/policy\/authorchoice_termsofuse.html"}],"funder":[{"DOI":"10.13039\/100006228","name":"Oak Ridge National Laboratory","doi-asserted-by":"publisher","award":["DE-AC05-00OR22725"],"award-info":[{"award-number":["DE-AC05-00OR22725"]}],"id":[{"id":"10.13039\/100006228","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2017,9,19]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Natural dissolved organic matter (DOM) affects mercury (Hg) redox reactions and anaerobic microbial methylation in the environment. Several studies have shown that DOM can enhance Hg methylation, especially under sulfidic conditions, whereas others show that DOM inhibits Hg methylation due to strong Hg\u2013DOM complexation. In this study, we investigated and compared the effects of DOM on Hg methylation by an iron-reducing bacterium Geobacter sulfurreducens PCA and a sulfate-reducing bacterium Desulfovibrio desulfuricans ND132 under nonsulfidic conditions. The methylation experiment was performed with washed cells either in the absence or presence of DOM or glutathione, both of which form strong complexes with Hg via thiol-functional groups. DOM was found to greatly inhibit Hg methylation by G. Sulfurreducens PCA but enhance Hg methylation by D. desulfuricans ND132 cells with increasing DOM concentration. These strain-dependent opposing effects of DOM were also observed with glutathione, suggesting that thiols in DOM likely played an essential role in affecting microbial Hg uptake and methylation. Additionally, DOM and glutathione greatly decreased Hg sorption by G. sulfurreducens PCA but showed little effect on D. desulfuricans ND132 cells, demonstrating that ND132 has a higher affinity to sorb or take up Hg than the PCA strain. These observations indicate that DOM effects on Hg methylation are bacterial strain specific, depend on the DOM:Hg ratio or site-specific conditions, and may thus offer new insights into the role of DOM in methylmercury production in the environment.<\/jats:p>","DOI":"10.1021\/acs.est.7b02518","type":"journal-article","created":{"date-parts":[[2017,8,14]],"date-time":"2017-08-14T15:15:21Z","timestamp":1502723721000},"page":"10468-10475","source":"Crossref","is-referenced-by-count":96,"title":["Contrasting\nEffects of Dissolved Organic Matter on\nMercury Methylation by\n                    <i>Geobacter sulfurreducens<\/i>\n                    PCA\nand\n                    <i>Desulfovibrio desulfuricans<\/i>\n                    ND132"],"prefix":"10.1021","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2718-4538","authenticated-orcid":true,"given":"Linduo","family":"Zhao","sequence":"first","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongmei","family":"Chen","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xia","family":"Lu","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Lin","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Geoff A.","family":"Christensen","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4951-1931","authenticated-orcid":true,"given":"Eric M.","family":"Pierce","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7299-2956","authenticated-orcid":true,"given":"Baohua","family":"Gu","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2017,8,14]]},"reference":[{"issue":"6125","key":"2026090312574042800_cit1","doi-asserted-by":"publisher","first-page":"1332","DOI":"10.1126\/science.1230667","article-title":"The genetic basis for bacterial mercury\nmethylation","volume":"339","author":"Parks","year":"2013","journal-title":"Science"},{"issue":"9","key":"2026090312574042800_cit2","doi-asserted-by":"publisher","first-page":"e1500675","DOI":"10.1126\/sciadv.1500675","article-title":"Global prevalence and distribution\nof genes and microorganisms\ninvolved in mercury methylation","volume":"1","author":"Podar","year":"2015","journal-title":"Sci. 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Environ.\nMicrobiol."},{"issue":"20","key":"2026090312574042800_cit50","doi-asserted-by":"publisher","first-page":"7337","DOI":"10.1128\/AEM.01792-12","article-title":"Detailed\nassessment of the kinetics of Hg-cell association, Hg methylation,\nand methylmercury degradation in several Desulfovibrio species","volume":"78","author":"Graham","year":"2012","journal-title":"Appl. Environ. Microbiol."},{"issue":"19","key":"2026090312574042800_cit51","doi-asserted-by":"publisher","first-page":"10922","DOI":"10.1021\/es400527m","article-title":"Mercury reduction and cell-surface\nadsorption by Geobacter sulfurreducens PCA","volume":"47","author":"Hu","year":"2013","journal-title":"Environ. Sci. Technol."},{"issue":"20","key":"2026090312574042800_cit52","doi-asserted-by":"publisher","first-page":"11049","DOI":"10.1021\/acs.est.6b03299","article-title":"Intracellular Hg(0)\nOxidation in Desulfovibrio desulfuricans ND132","volume":"50","author":"Wang","year":"2016","journal-title":"Environ. Sci. Technol."},{"key":"2026090312574042800_cit53","doi-asserted-by":"publisher","first-page":"7395","DOI":"10.1021\/acs.est.7b01047","article-title":"Controls on bacterial\ncell envelope sulfhydryl site\nconcentrations: The effect of glucose concentration during growth","volume":"51","author":"Yu","year":"2017","journal-title":"Environ. Sci. Technol."},{"issue":"1","key":"2026090312574042800_cit54","doi-asserted-by":"publisher","first-page":"457","DOI":"10.1128\/AEM.72.1.457-464.2006","article-title":"Mercury methylation\nfrom unexpected sources: Molybdate-inhibited freshwater sediments\nand an iron-reducing bacterium","volume":"72","author":"Fleming","year":"2006","journal-title":"Appl. Environ.\nMicrobiol."},{"issue":"19","key":"2026090312574042800_cit55","doi-asserted-by":"publisher","first-page":"6068","DOI":"10.1128\/AEM.01271-16","article-title":"Development\nand validation of broad-range qualitative and clade-specific quantitative\nmolecular probes for assessing mercury methylation in the environment","volume":"82","author":"Christensen","year":"2016","journal-title":"Appl. Environ. Microbiol."},{"issue":"10","key":"2026090312574042800_cit56","doi-asserted-by":"publisher","first-page":"3540","DOI":"10.1021\/acs.jproteome.6b00263","article-title":"Global proteome response\nto deletion of genes related to mercury methylation and dissimilatory\nmetal reduction reveals changes in respiratory metabolism in Geobacter sulfurreducens PCA","volume":"15","author":"Qian","year":"2016","journal-title":"J. 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