Selenite-reducing capacity of the copper-containing nitrite reductase of<i>Rhizobium sullae</i>

Basaglia, Marina; Toffanin, Annita; Baldan, Enrico; Bottegal, Mariangela; Shapleigh, James P.; Casella, Sergio

doi:10.1111/j.1574-6968.2006.00617.x

Cited by 64 publications

(40 citation statements)

References 18 publications

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“…Some eukaryotes, in particular those harboring both NirK and P450nor, like F. oxysporum, would have conserved the denitrification system derived from the protomitochondrion, although it was modified (adoption of P450nor). It is also possible that some eukaryotic NirK proteins have modulated its function, like NirK of Rhizobium sullae, which has acquired the ability to reduce selenite (2).…”

Section: Resultsmentioning

confidence: 99%

Eukaryotic nirK Genes Encoding Copper-Containing Nitrite Reductase: Originating from the Protomitochondrion?

Kim

Fushinobu

Zhou

et al. 2009

Appl Environ Microbiol

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Although denitrification or nitrate respiration has been found among a few eukaryotes, its phylogenetic relationship with the bacterial system remains unclear because orthologous genes involved in the bacterial denitrification system were not identified in these eukaryotes. In this study, we isolated a gene from the denitrifying fungus Fusarium oxysporum that is homologous to the bacterial nirK gene responsible for encoding copper-containing nitrite reductase (NirK). Characterization of the gene and its recombinant protein showed that the fungal nirK gene is the first eukaryotic ortholog of the bacterial counterpart involved in denitrification. Additionally, recent genome analyses have revealed the occurrence of nirK homologs in many fungi and protozoa, although the denitrifying activity of these eukaryotes has never been examined. These eukaryotic homolog genes, together with the fungal nirK gene of F. oxysporum, are grouped in the same branch of the phylogenetic tree as the nirK genes of bacteria, archaea, and eukaryotes, implying that eukaryotic nirK and its homologs evolved from a single ancestor (possibly the protomitochondrion). These results show that the fungal denitrifying system has the same origin as its bacterial counterpart.

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Section: Resultsmentioning

confidence: 99%

Eukaryotic nirK Genes Encoding Copper-Containing Nitrite Reductase: Originating from the Protomitochondrion?

Kim

Fushinobu

Zhou

et al. 2009

Appl Environ Microbiol

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“…Apart from glutathione-mediated reduction, respiratory reductases (i.e., nitrite reductase, sulfite reductase, and hydrogenase 1) can support SeO 3 2Ϫ reduction in some microorganisms (e.g., T. selenatis AX, Rhizobium sullae strain HCNT1, and Clostridium pasteurianum) (98)(99)(100).…”

Section: Selenite Reductionmentioning

confidence: 99%

Ecology and Biotechnology of Selenium-Respiring Bacteria

Nancharaiah

2015

Microbiol Mol Biol Rev

348

232

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SUMMARY In nature, selenium is actively cycled between oxic and anoxic habitats, and this cycle plays an important role in carbon and nitrogen mineralization through bacterial anaerobic respiration. Selenium-respiring bacteria (SeRB) are found in geographically diverse, pristine or contaminated environments and play a pivotal role in the selenium cycle. Unlike its structural analogues oxygen and sulfur, the chalcogen selenium and its microbial cycling have received much less attention by the scientific community. This review focuses on microorganisms that use selenate and selenite as terminal electron acceptors, in parallel to the well-studied sulfate-reducing bacteria. It overviews the significant advancements made in recent years on the role of SeRB in the biological selenium cycle and their ecological role, phylogenetic characterization, and metabolism, as well as selenium biomineralization mechanisms and environmental biotechnological applications.

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“…Later, dissimilatory sulfate-independent bacterial respiration was discovered (Oremland et al 1989) (this sulfate-independent respiration has been recently proved by Lenz et al (2008b), who fed bacteria with sulfate in 2,600 molar excess to selenate in a continuous manner, showing that selenate still was completely reduced). Since then, many bacterial cultures capable of selenate and selenite respiratory growth have been observed (Basaglia et al 2007;Blum et al 1998;Ghosh et al 2008;Hunter 2007;Hunter et al 2007;Macy et al 1989;Narasingarao and Haggblom 2007; see review by Stolz et al 2006;Stolz and Oremland 1999). To date, about 16 diverse species of bacteria and archaea have been described that grow anaerobically by linking the oxidation of organic substrates or H 2 to the dissimilatory reduction of selenium oxyanions (Oremland and Stolz 2000;Stolz and Oremland 1999).…”

Section: Selenium Oxido-reduction Processesmentioning

confidence: 99%

Selenium environmental cycling and bioavailability: a structural chemist point of view

Fernández-Martı́nez

Charlet

2009

Rev Environ Sci Biotechnol

387

235

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International audienceSelenium is usually known as the ‘double-edged sword element' for its dual toxic and beneficial character to health. Since the pioneer works by Schwarz and Foltz on the relationships between selenium deficiency and liver, muscle and heart diseases, many efforts have been undertaken to better understand the role of selenium in health. At the same time, an increasing number of publications have appeared during these last years on the selenium physico–chemical interactions within the environment. Both types of research represent ongoing efforts to correctly estimate the bioavailability of selenium species for health and the environment. Redox reactions, diffusion, adsorption and precipitation processes or interactions with organic matter and biota govern the speciation and mobility of selenium in the environment. This review intends to emphasize and collect the important advances made during these last years in the mechanistic understanding of processes which govern selenium cycling and bioavailability, like adsorption at the mineral/water interface, precipitation of elemental selenium, or bioavailability of nanoscaled precipitates. The advent of powerful spectroscopic techniques, like X-ray absorption spectroscopy, has allowed the structural description of adsorption and substitution processes that selenium undergoes in a variety of minerals. These and other structural details about selenium precipitates are reviewed here, together with their relationships to the bioavailability of the element in the environment

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Selenite-reducing capacity of the copper-containing nitrite reductase ofRhizobium sullae

Cited by 64 publications

References 18 publications

Eukaryotic nirK Genes Encoding Copper-Containing Nitrite Reductase: Originating from the Protomitochondrion?

Eukaryotic nirK Genes Encoding Copper-Containing Nitrite Reductase: Originating from the Protomitochondrion?

Ecology and Biotechnology of Selenium-Respiring Bacteria

Selenium environmental cycling and bioavailability: a structural chemist point of view

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