The
 fox
 Operon from
 Rhodobacter
 Strain SW2 Promotes Phototrophic Fe(II) Oxidation in
 Rhodobacter capsulatus
 SB1003

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

doi:10.1128/jb.01395-06

Cited by 92 publications

(88 citation statements)

References 56 publications

(58 reference statements)

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“…Neither the Zetaproteobacteria SAGs nor isolates contain homologs to well-characterized genes involved in iron oxidation identified in other microorganisms including iro (Amouric et al, 2011), rus (Cox and Boxer, 1978), mtoAB (Shi et al, 2012), pioABC , foxEYZ (Croal et al, 2007) and cyt579 (Singer et al, 2008). Previous studies have suggested that the Zetaproteobacteria may use a molybdopterin oxidoreductase and alternative respiratory complex III mechanism to carry out iron oxidation (Singer et al, 2011).…”

Section: Potential For Iron Oxidationmentioning

confidence: 99%

Genomic insights into the uncultivated marine Zetaproteobacteria at Loihi Seamount

et al. 2014

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The Zetaproteobacteria are a candidate class of marine iron-oxidizing bacteria that are typically found in high iron environments such as hydrothermal vent sites. As much remains unknown about these organisms due to difficulties in cultivation, single-cell genomics was used to learn more about this elusive group at Loihi Seamount. Comparative genomics of 23 phylogenetically diverse single amplified genomes (SAGs) and two isolates indicate niche specialization among the Zetaproteobacteria may be largely due to oxygen tolerance and nitrogen transformation capabilities. Only Form II ribulose 1,5-bisphosphate carboxylase (RubisCO) genes were found in the SAGs, suggesting that some of the uncultivated Zetaproteobacteria may be adapted to low oxygen and/or high carbon dioxide concentrations. There is also genomic evidence of oxygen-tolerant cytochrome c oxidases and oxidative stress-related genes, indicating that others may be exposed to higher oxygen conditions. The Zetaproteobacteria also have the genomic potential for acquiring nitrogen from numerous sources including ammonium, nitrate, organic compounds, and nitrogen gas. Two types of molybdopterin oxidoreductase genes were found in the SAGs, indicating that those found in the isolates, thought to be involved in iron oxidation, are not consistent among all the Zetaproteobacteria. However, a novel cluster of redox-related genes was found to be conserved in 10 SAGs as well as in the isolates warranting further investigation. These results were used to isolate a novel iron-oxidizing Zetaproteobacteria. Physiological studies and genomic analysis of this isolate were able to support many of the findings from SAG analyses demonstrating the value of these data for designing future enrichment strategies.

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Section: Potential For Iron Oxidationmentioning

confidence: 99%

Genomic insights into the uncultivated marine Zetaproteobacteria at Loihi Seamount

et al. 2014

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“…Another three-gene operon, the fox operon, has been identified in Rhodobacter sp. strain SW2 and shown to confer enhanced phototrophic iron oxidation reactivity upon the genetically tractable strain Rhodobacter capsulatus SB1003 (Croal et al, 2007).…”

Section: Genomic and Molecular Biologymentioning

confidence: 99%

The iron-oxidizing proteobacteria

2011

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The ‘iron bacteria’ are a collection of morphologically and phylogenetically heterogeneous prokaryotes. They include some of the first micro-organisms to be observed and described, and continue to be the subject of a considerable body of fundamental and applied microbiological research. While species of iron-oxidizing bacteria can be found in many different phyla, most are affiliated with the Proteobacteria. The latter can be subdivided into four main physiological groups: (i) acidophilic, aerobic iron oxidizers; (ii) neutrophilic, aerobic iron oxidizers; (iii) neutrophilic, anaerobic (nitrate-dependent) iron oxidizers; and (iv) anaerobic photosynthetic iron oxidizers. Some species (mostly acidophiles) can reduce ferric iron as well as oxidize ferrous iron, depending on prevailing environmental conditions. This review describes what is currently known about the phylogenetic and physiological diversity of the iron-oxidizing proteobacteria, their significance in the environment (on the global and micro scales), and their increasing importance in biotechnology.

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“…In the companion paper to this article, we report the discovery of a c-type cytochrome and a putative pyrroloquinoline quinone-containing enzyme from an Fe(II)-oxidizing strain-Rhodobacter sp. strain SW2-that stimulate Fe(II) oxidation activity in its close relative Rhodobacter capsulatus SB1003 (11). Because our ability to explore the mechanistic basis of Fe(II) oxidation in SW2 is limited because of the impracticality of direct mutational analysis (11), we established a genetic system in a different Fe(II)-oxidizing phototroph, Rhodopseudomonas palustris TIE-1 (28).…”

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confidence: 99%

The pio Operon Is Essential for Phototrophic Fe(II) Oxidation in Rhodopseudomonas palustris TIE-1

2007

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The fox Operon from Rhodobacter Strain SW2 Promotes Phototrophic Fe(II) Oxidation in Rhodobacter capsulatus SB1003

Cited by 92 publications

References 56 publications

Genomic insights into the uncultivated marine Zetaproteobacteria at Loihi Seamount

Genomic insights into the uncultivated marine Zetaproteobacteria at Loihi Seamount

The iron-oxidizing proteobacteria

The pio Operon Is Essential for Phototrophic Fe(II) Oxidation in Rhodopseudomonas palustris TIE-1

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