ArticleApplied and environmental microbiology2014
Potential role of nitrite for abiotic Fe(II) oxidation and cell encrustation during nitrate reduction by denitrifying bacteria.
Article in Applied and environmental microbiology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 47 papers.
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47 citing papers in PubMed, 227 citations in OpenAlex.
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- Expanded Diversity of Microbial Groups Capable of Anaerobic Pyrite Reduction and Assimilation of Dissolution Products.Environmental microbiology · 2025Article
- Bacterial nitrite production oxidizes Fe(II) bioremediating acidic abandoned coal mine drainage.Applied and environmental microbiology · 2025Article
- Nitrous oxide is the main product during nitrate reduction by a novel lithoautotrophic iron(II)-oxidizing culture from an organic-rich paddy soil.Applied and environmental microbiology · 2025Article
- Carotenoid-ProducingJournal of microbiology and biotechnology · 2024Article
- The Application of Nano Zero-Valent Iron in Synergy with White Rot Fungi in Environmental Pollution Control.Toxics · 2024Review
- Gallionellaceae pangenomic analysis reveals insight into phylogeny, metabolic flexibility, and iron oxidation mechanisms.mSystems · 2023Article
- Continuous cultivation of the lithoautotrophic nitrate-reducing Fe(II)-oxidizing culture KS in a chemostat bioreactor.Environmental microbiology reports · 2023Article
- Microbial mixotrophic denitrification using iron(II) as an assisted electron donor.Water research X · 2023Article
- Metabolic Performance and Fate of Electrons during Nitrate-Reducing Fe(II) Oxidation by the Autotrophic Enrichment Culture KS Grown at Different Initial Fe/N Ratios.Applied and environmental microbiology · 2023Article
- Metagenomic Features Characterized with Microbial Iron Oxidoreduction and Mineral Interaction in Southwest Indian Ridge.Microbiology spectrum · 2022Article
- Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron OxidizerEnvironmental science & technology · 2022Article
- Impact of high Fe-concentrations on microbial community structure and dissolved organics in hydrothermal plumes: an experimental study.Scientific reports · 2022Article
- Manganese removal and product characteristics of a marine manganese-oxidizing bacterium Bacillus sp. FF-1.International microbiology : the official journal of the Spanish Society for Microbiology · 2022Article
- Underestimation about the Contribution of Nitrate Reducers to Iron Cycling Indicated byMolecules (Basel, Switzerland) · 2022Article
- Salinity Impact on Composition and Activity of Nitrate-Reducing Fe(II)-Oxidizing Microorganisms in Saline Lakes.Applied and environmental microbiology · 2022Article
- Oligotrophic Growth of Nitrate-Dependent FeFrontiers in microbiology · 2022Article
- Unchanged nitrate and nitrite isotope fractionation during heterotrophic and Fe(II)-mixotrophic denitrification suggest a non-enzymatic link between denitrification and Fe(II) oxidation.Frontiers in microbiology · 2022Article
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Authors and funding
7 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Microorganisms have been observed to oxidize Fe(II) at neutral pH under anoxic and microoxic conditions. While most of the mixotrophic nitrate-reducing Fe(II)-oxidizing bacteria become encrusted with Fe(III)-rich minerals, photoautotrophic and microaerophilic Fe(II) oxidizers avoid cell encrustation. The Fe(II) oxidation mechanisms and the reasons for encrustation remain largely unresolved. Here we used cultivation-based methods and electron microscopy to compare two previously described nitrate-reducing Fe(II) oxidizers ( Acidovorax sp. strain BoFeN1 and Pseudogulbenkiania sp. strain 2002) and two heterotrophic nitrate reducers (Paracoccus denitrificans ATCC 19367 and P. denitrificans Pd 1222). All four strains oxidized ∼8 mM Fe(II) within 5 days in the presence of 5 mM acetate and accumulated nitrite (maximum concentrations of 0.8 to 1.0 mM) in the culture media. Iron(III) minerals, mainly goethite, formed and precipitated extracellularly in close proximity to the cell surface. Interestingly, mineral formation was also observed within the periplasm and cytoplasm; intracellular mineralization is expected to be physiologically disadvantageous, yet acetate consumption continued to be observed even at an advanced stage of Fe(II) oxidation. Extracellular polymeric substances (EPS) were detected by lectin staining with fluorescence microscopy, particularly in the presence of Fe(II), suggesting that EPS production is a response to Fe(II) toxicity or a strategy to decrease encrustation. Based on the data presented here, we propose a nitrite-driven, indirect mechanism of cell encrustation whereby nitrite forms during heterotrophic denitrification and abiotically oxidizes Fe(II). This work adds to the known assemblage of Fe(II)-oxidizing bacteria in nature and complicates our ability to delineate microbial Fe(II) oxidation in ancient microbes preserved as fossils in the geological record.
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