Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp. strain BoFeN1

Hohmann, Claudia; Morin, Guillaume; Ona-Nguéma, Georges; Guigner, Jean‐Michel; Brown, Gordon E.; Kappler, Andreas

doi:10.1016/j.gca.2011.02.044

Cited by 104 publications

(104 citation statements)

References 53 publications

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“…Biogenically produced Fe(III) (oxyhydr)oxides are highly reactive toward other metal-(loid)s, such as arsenic and uranium, organic pollutants (5,6,25,45), and nutrients such as phosphate (78). The abiotically driven formation of Fe(III) (oxyhydr)oxide minerals by nitrite that is produced by nitrate-reducing bacteria shows that under specific conditions, these very abundant bacteria may influence and facilitate immobilization and transformation of organic and inorganic pollutants, which until now were often mainly attributed to specific Fe(II) oxidizers and Fe(III) reducers (79). The fact that denitrifying bacteria are also able to cause Fe(II) oxidation will help us to better understand anaerobic Fe(II) oxidation in the environment.…”

Section: Discussionmentioning

confidence: 99%

Potential Role of Nitrite for Abiotic Fe(II) Oxidation and Cell Encrustation during Nitrate Reduction by Denitrifying Bacteria

Klueglein

Zeitvogel

Stierhof

et al. 2014

Appl Environ Microbiol

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182

239

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Section: Discussionmentioning

confidence: 99%

Potential Role of Nitrite for Abiotic Fe(II) Oxidation and Cell Encrustation during Nitrate Reduction by Denitrifying Bacteria

Klueglein

Zeitvogel

Stierhof

et al. 2014

Appl Environ Microbiol

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182

239

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“…The authors found hints of evidence that adsorption of cellular material released during osmotic shock introduced by sample preparation may be responsible for higher fractions of organic carbon in the stalks (35). Such sorption of charged organic molecules, but also binding of metal cations, such as nickel, to the stalks, is expected based on previous studies with microaerophilic (31,(34)(35)(36)(37) and anaerobic Fe(II)-oxidizing bacteria (34,(38)(39)(40)(41). Some of these metal cations are important for bacterial growth (42,43); nickel, for example, is an essential nutrient for some microorganisms and is incorporated into nickel-dependent enzymes (43).…”

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confidence: 82%

Microaerophilic Fe(II)-Oxidizing Zetaproteobacteria Isolated from Low-Fe Marine Coastal Sediments: Physiology and Composition of Their Twisted Stalks

Laufer

Nordhoff

Halama

et al. 2017

Appl Environ Microbiol

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Microaerophilic Fe(II) oxidizers are commonly found in habitats containing elevated Fe(II) and low O 2 concentrations and often produce characteristic Fe mineral structures, so-called twisted stalks or tubular sheaths. Isolates originating from freshwater habitats are all members of the Betaproteobacteria, while isolates from marine habitats belong almost exclusively to the Zetaproteobacteria. So far, only a few isolates of marine microaerophilic Fe(II) oxidizers have been described, all of which are obligate microaerophilic Fe(II) oxidizers and have been thought to be restricted to Fe-rich systems. Here, we present two new isolates of marine microaerophilic Fe(II)-oxidizing Zetaproteobacteria that originate from typical coastal marine sediments containing only low Fe concentrations (2 to 11 mg of total Fe/g of sediment [dry weight]; 70 to 100 M dissolved Fe 2ϩ in the porewater). The two novel Zetaproteobacteria share characteristic physiological properties of the Zetaproteobacteria group, even though they come from low-Fe environments: the isolates are obligate microaerophilic Fe(II) oxidizers and, like most isolated Zetaproteobacteria, they produce twisted stalks. We found a low organic carbon content in the stalks (ϳ0.3 wt%), with mostly polysaccharides and saturated aliphatic chains (most likely lipids). The Fe minerals in the stalks were identified as lepidocrocite and possibly ferrihydrite. Immobilization experiments with Ni 2ϩ showed that the stalks can function as a sink for trace metals. Our findings show that obligate microaerophilic Fe(II) oxidizers belonging to the Zetaproteobacteria group are not restricted to Fe-rich environments but can also be found in low-Fe marine environments, which increases their overall importance for the global biogeochemical Fe cycle.IMPORTANCE So far, only a few isolates of benthic marine microaerophilic Fe(II) oxidizers belonging to the Zetaproteobacteria exist, and most isolates were obtained from habitats containing elevated Fe concentrations. Consequently, it was thought that these microorganisms are important mainly in habitats with high Fe concentrations. The two novel isolates of Zetaproteobacteria that are presented in the present study were isolated from typical coastal marine sediments that do not contain elevated Fe concentrations. This increases the knowledge about possible habitats in which Zetaproteobacteria can exist. Furthermore, we show that the physiology and the typical organo-mineral structures (twisted stalks) that are produced by the isolates do not notably differ from the physiology and the cell-mineral structures of

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“…Within 2 weeks at 28°C more than 90% of the Fe(II) was oxidized and the As−Fe coprecipitates were harvested anoxically and washed once with sterile, anoxic Millipore water. According to EXAFS analysis in Hohmann et al, 40 As-free and As(III)-bearing biogenic Fe(III) (oxyhydr)-oxides consist mainly of goethite and approximately 13 ± 5% ferrihydrite, while As(V)-bearing biogenic Fe(III) (oxyhydr)-oxides contain approximately 49 ± 10% ferrihydrite and 51 ± 10% goethite. Biogenic and abiogenic minerals were collected by centrifugation at 7100g for 12 min, resuspended in anoxic, sterile MQ water and used within two weeks of synthesis.…”

Section: Source Of Microorganism and Growth Conditionsmentioning

confidence: 99%

Fate of Arsenic during Microbial Reduction of Biogenic versus Abiogenic As–Fe(III)–Mineral Coprecipitates

Muehe

Scheer²,

Daus³

et al. 2013

Environ. Sci. Technol.

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Fe(III) (oxyhydr)oxide minerals exhibit a high sorption affinity for arsenic (As) and the reductive dissolution of As-bearing Fe(III) (oxyhydr)oxides is considered to be the primary mechanism for As release into groundwater. To date, research has focused on the reactivity of abiogenic Fe(III) (oxyhydr)oxides, yet in nature biogenic Fe(III) (oxyhydr)oxides, precipitated by Fe(II)-oxidizing bacteria are also present. These biominerals contain cell-derived organic matter (CDOM), leading to different properties than their abiogenic counterparts. Here, we follow Fe mineralogy and As mobility during the reduction of As-loaded biogenic and abiogenic Fe(III) minerals by Shewanella oneidensis MR-1. We found that microbial reduction of As(III)-bearing biogenic Fe(III) (oxyhydr)oxides released more As than reduction of abiogenic Fe(III) (oxyhydr)oxides. In contrast, As was immobilized more effectively during reduction of As(V)-loaded biogenic than abiogenic Fe(III) (oxyhydr)oxides during secondary Fe mineral formation. During sterile incubation of minerals and after microbial Fe(III) reduction stopped, As(V) was mobilized from biogenic Fe(III) (oxyhydr)oxides probably by sorption competition with phosphate and CDOM. Our data show that the presence of CDOM significantly influences As mobility during reduction of Fe(III) minerals and we suggest that it is essential to consider both biogenic and abiogenic Fe(III) (oxyhydr)oxides to further understand the environmental fate of As.

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Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp. strain BoFeN1

Cited by 104 publications

References 53 publications

Potential Role of Nitrite for Abiotic Fe(II) Oxidation and Cell Encrustation during Nitrate Reduction by Denitrifying Bacteria

Potential Role of Nitrite for Abiotic Fe(II) Oxidation and Cell Encrustation during Nitrate Reduction by Denitrifying Bacteria

Microaerophilic Fe(II)-Oxidizing Zetaproteobacteria Isolated from Low-Fe Marine Coastal Sediments: Physiology and Composition of Their Twisted Stalks

Fate of Arsenic during Microbial Reduction of Biogenic versus Abiogenic As–Fe(III)–Mineral Coprecipitates

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