Bacterial Dissimilatory Reduction of Arsenic(V) to Arsenic(III) in Anoxic Sediments.

Applied and Environmental Microbiology
P DowdleR S Oremland

Abstract

Incubation of anoxic salt marsh sediment slurries with 10 mM As(V) resulted in the disappearance over time of the As(V) in conjunction with its recovery as As(III). No As(V) reduction to As(III) occurred in heat-sterilized or formalin-killed controls or in live sediments incubated in air. The rate of As(V) reduction in slurries was enhanced by addition of the electron donor lactate, H(inf2), or glucose, whereas the respiratory inhibitor/uncoupler dinitrophenol, rotenone, or 2-heptyl-4-hydroxyquinoline N-oxide blocked As(V) reduction. As(V) reduction was also inhibited by tungstate but not by molybdate, sulfate, or phosphate. Nitrate inhibited As(V) reduction by its action as a preferred respiratory electron acceptor rather than as a structural analog of As(V). Nitrate-respiring sediments could reduce As(V) to As(III) once all the nitrate was removed. Chloramphenicol blocked the reduction of As(V) to As(III) in nitrate-respiring sediments, suggesting that nitrate and arsenate were reduced by separate enzyme systems. Oxidation of [2-(sup14)C]acetate to (sup14)CO(inf2) by salt marsh and freshwater sediments was coupled to As(V). Collectively, these results show that reduction of As(V) in sediments proceeds by a dissimilatory proce...Continue Reading

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Citations

Sep 27, 2002·Applied and Environmental Microbiology·Ronald S OremlandJames T Hollibaugh
Dec 18, 2002·Journal of Bacteriology·Daniel MullerMarie-Claire Lett
Dec 14, 2005·Environmental Microbiology·Tina M SalmassiJanet G Hering
Nov 6, 2004·Applied and Environmental Microbiology·Thomas R KulpRonald S Oremland
Apr 28, 2010·The Journal of Biological Chemistry·Aurélie LieutaudBarbara Schoepp-Cothenet
Dec 4, 2016·Applied and Environmental Microbiology·Babur S MirzaJoan E McLean
Jul 17, 2007·Applied and Environmental Microbiology·Rhesa N LedbetterTimothy S Magnuson
Jun 10, 2016·FEMS Microbiology Letters·Doriana Mădălina VoicaAharon Oren
Jan 28, 2020·Environmental Microbiology·Katharina KujalaBritta Planer-Friedrich
Dec 1, 2004·Annual Review of Genetics·Laura R CroalDianne K Newman
Feb 20, 2009·Environmental Microbiology·Kim M HandleyJonathan R Lloyd
Jun 27, 2009·Journal of Environmental Monitoring : JEM·G Du LaingM G Verloo
Jun 27, 2001·Applied and Environmental Microbiology·L KuaiM F Polz
Jun 18, 2011·Journal of Industrial Microbiology & Biotechnology·Young C ChangShintaro Kikuchi
Jan 30, 2021·FEMS Microbiology Ecology·Almudena Escobar-NiñoDavid Cánovas
Dec 3, 2014·The Science of the Total Environment·Josselin GornyCatherine Noiriel
May 1, 1997·Applied and Environmental Microbiology·D K NewmanF Morel
Nov 28, 2013·Environmental Science & Technology·Thomas R KulpRonald S Oremland
Mar 5, 2004·Environmental Science & Technology·Ruxandra M FloroiuAlba Torrents
Apr 19, 2007·Environmental Science & Technology·Axel C HeimannRasmus Jakobsen
Oct 21, 2006·Environmental Science & Technology·Kate M CampbellJanet G Hering
Jan 11, 2002·Environmental Science & Technology·R E MacurW P Inskeep
May 10, 2003·Science·Ronald S Oremland, John F Stolz

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