Isolation and Characterization of a Genetically Tractable Photoautotrophic Fe(II)-Oxidizing Bacterium,
            <i>Rhodopseudomonas palustris</i>
            Strain TIE-1

Jiao, Yongqin; Kappler, Andreas; Croal, Laura R.; Newman, Dianne K.

doi:10.1128/aem.71.8.4487-4496.2005

Cited by 193 publications

(215 citation statements)

References 63 publications

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“…(CARN5), as it may be observed in already sequenced related bacteria (http://www.genoscope.cns.fr/agc/microscope/ carnoulescope). In Rhodopseudomonas palustris strain TIE-1, a CobS-like protein has been previously shown to be involved in iron oxidation, but the mechanism remains unclear (Jiao et al, 2005). Interestingly, we showed that cobalamin strongly activates iron oxidation in At.…”

Section: Discussionsupporting

confidence: 49%

Metabolic diversity among main microorganisms inside an arsenic-rich ecosystem revealed by meta- and proteo-genomics

et al. 2011

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By their metabolic activities, microorganisms have a crucial role in the biogeochemical cycles of elements. The complete understanding of these processes requires, however, the deciphering of both the structure and the function, including synecologic interactions, of microbial communities. Using a metagenomic approach, we demonstrated here that an acid mine drainage highly contaminated with arsenic is dominated by seven bacterial strains whose genomes were reconstructed. Five of them represent yet uncultivated bacteria and include two strains belonging to a novel bacterial phylum present in some similar ecosystems, and which was named 'Candidatus Fodinabacter communificans.' Metaproteomic data unravelled several microbial capabilities expressed in situ, such as iron, sulfur and arsenic oxidation that are key mechanisms in biomineralization, or organic nutrient, amino acid and vitamin metabolism involved in synthrophic associations. A statistical analysis of genomic and proteomic data and reverse transcriptase-PCR experiments allowed us to build an integrated model of the metabolic interactions that may be of prime importance in the natural attenuation of such anthropized ecosystems.

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Section: Discussionsupporting

confidence: 49%

Metabolic diversity among main microorganisms inside an arsenic-rich ecosystem revealed by meta- and proteo-genomics

et al. 2011

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“…It has also been reported that conductive minerals, such as magnetite, abundantly exist on the present and ancient Earth (14). Furthermore, reports have documented that dissimilatory iron-oxidizing and iron-reducing microbes generate crystalline iron-oxide nanoparticles as a result of respiration (28,32). We, therefore, consider that microbes have evolved biomolecular machineries for discharging electrons to and accepting them from mineral particles around their cells, resulting in IETs via electric currents.…”

Section: Discussionmentioning

confidence: 99%

Microbial interspecies electron transfer via electric currents through conductive minerals

Kato

Hashimoto²,

Watanabe³

2012

Proc. Natl. Acad. Sci. U.S.A.

499

288

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In anaerobic biota, reducing equivalents (electrons) are transferred between different species of microbes [interspecies electron transfer (IET)], establishing the basis of cooperative behaviors and community functions. IET mechanisms described so far are based on diffusion of redox chemical species and/or direct contact in cell aggregates. Here, we show another possibility that IET also occurs via electric currents through natural conductive minerals. Our investigation revealed that electrically conductive magnetite nanoparticles facilitated IET from Geobacter sulfurreducens to Thiobacillus denitrificans, accomplishing acetate oxidation coupled to nitrate reduction. This two-species cooperative catabolism also occurred, albeit one order of magnitude slower, in the presence of Fe ions that worked as diffusive redox species. Semiconductive and insulating iron-oxide nanoparticles did not accelerate the cooperative catabolism. Our results suggest that microbes use conductive mineral particles as conduits of electrons, resulting in efficient IET and cooperative catabolism. Furthermore, such natural mineral conduits are considered to provide ecological advantages for users, because their investments in IET can be reduced. Given that conductive minerals are ubiquitously and abundantly present in nature, electric interactions between microbes and conductive minerals may contribute greatly to the coupling of biogeochemical reactions.bioenergy | biogeochemistry | electrode respiration | microbial ecology

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“…Most of these are the same as those found from primary sources. A notable exception is iron oxides, which form as a product of anoxygenic photosynthesis with Fe 2C as the electron donor (Widdel et al 1993;Heising et al 1999;Jiao et al 2005).…”

Section: Early Energy and Possible Community Structurementioning

confidence: 99%

Early anaerobic metabolisms

Canfield

Rosing

Bjerrum

2006

Phil. Trans. R. Soc. B

330

311

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Before the advent of oxygenic photosynthesis, the biosphere was driven by anaerobic metabolisms. We catalogue and quantify the source strengths of the most probable electron donors and electron acceptors that would have been available to fuel early-Earth ecosystems. The most active ecosystems were probably driven by the cycling of H 2 and Fe 2C through primary production conducted by anoxygenic phototrophs. Interesting and dynamic ecosystems would have also been driven by the microbial cycling of sulphur and nitrogen species, but their activity levels were probably not so great. Despite the diversity of potential early ecosystems, rates of primary production in the early-Earth anaerobic biosphere were probably well below those rates observed in the marine environment. We shift our attention to the Earth environment at 3.8 Gyr ago, where the earliest marine sediments are preserved. We calculate, consistent with the carbon isotope record and other considerations of the carbon cycle, that marine rates of primary production at this time were probably an order of magnitude (or more) less than today. We conclude that the flux of reduced species to the Earth surface at this time may have been sufficient to drive anaerobic ecosystems of sufficient activity to be consistent with the carbon isotope record. Conversely, an ecosystem based on oxygenic photosynthesis was also possible with complete removal of the oxygen by reaction with reduced species from the mantle.

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Isolation and Characterization of a Genetically Tractable Photoautotrophic Fe(II)-Oxidizing Bacterium, Rhodopseudomonas palustris Strain TIE-1

Cited by 193 publications

References 63 publications

Metabolic diversity among main microorganisms inside an arsenic-rich ecosystem revealed by meta- and proteo-genomics

Metabolic diversity among main microorganisms inside an arsenic-rich ecosystem revealed by meta- and proteo-genomics

Microbial interspecies electron transfer via electric currents through conductive minerals

Early anaerobic metabolisms

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