ArticleFrontiers in microbiology2015
Characterization of pH dependent Mn(II) oxidation strategies and formation of a bixbyite-like phase by Mesorhizobium australicum T-G1.
Article in Frontiers in microbiology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed, 60 citations in OpenAlex.
- Epidermal microorganisms contributed to the toxic mechanism of nZVI and TCEP in earthworms by robbing metal elements and nutrients.Eco-Environment & Health · 2024Article
- Manganese Pollution and Its Remediation: A Review of Biological Removal and Promising Combination Strategies.Microorganisms · 2022Review
- Mineralogical and Genomic Constraints on the Origin of Microbial Mn Oxide Formation in Complexed Microbial Community at the Terrestrial Hot Spring.Life (Basel, Switzerland) · 2022Article
- Removal of Mn(II) by a nitrifying bacterium Acinetobacter sp. AL-6: efficiency and mechanisms.Environmental science and pollution research international · 2021Article
- Enrichment of marine manganese-oxidizing microorganisms using polycaprolactone as a solid organic substrate.Biotechnology letters · 2021Article
- Manganese Stress Adaptation Mechanisms ofFrontiers in microbiology · 2021Article
- Microbiomes in a manganese oxide producing ecosystem in the Ytterby mine, Sweden: impact on metal mobility.FEMS microbiology ecology · 2020Article
- Mn oxide formation by phototrophs: Spatial and temporal patterns, with evidence of an enzymatic superoxide-mediated pathway.Scientific reports · 2019Article
- Ripening of bananas using Bowdichia virgilioides Kunth leaves.Scientific reports · 2019Article
- Production of Manganese Oxide Nanoparticles by Shewanella Species.Applied and environmental microbiology · 2016Article
- Biological Low-pH Mn(II) Oxidation in a Manganese Deposit Influenced by Metal-Rich Groundwater.Applied and environmental microbiology · 2016Article
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Authors and funding
9 authors at 6 institutions in 2 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Despite the ubiquity of Mn oxides in natural environments, there are only a few observations of biological Mn(II) oxidation at pH < 6. The lack of low pH Mn-oxidizing bacteria (MOB) isolates limits our understanding of how pH influences biological Mn(II) oxidation in extreme environments. Here, we report that a novel MOB isolate, Mesorhizobium australicum strain T-G1, isolated from an acidic and metalliferous uranium mining area, can oxidize Mn(II) at both acidic and neutral pH using different enzymatic pathways. X-ray diffraction, Raman spectroscopy, and scanning electron microscopy with energy dispersive X-ray spectroscopy revealed that T-G1 initiated bixbyite-like Mn oxide formation at pH 5.5 which coincided with multi-copper oxidase expression from early exponential phase to late stationary phase. In contrast, reactive oxygen species (ROS), particularly superoxide, appeared to be more important for T-G1 mediated Mn(II) oxidation at neutral pH. ROS was produced in parallel with the occurrence of Mn(II) oxidation at pH 7.2 from early stationary phase. Solid phase Mn oxides did not precipitate, which is consistent with the presence of a high amount of H2O2 and lower activity of catalase in the liquid culture at pH 7.2. Our results show that M. australicum T-G1, an acid tolerant MOB, can initiate Mn(II) oxidation by varying its oxidation mechanisms depending on the pH and may play an important role in low pH manganese biogeochemical cycling.
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