Comparative proteomic analysis of sulfur-oxidizing Acidithiobacillus ferrooxidans CCM 4253 cultures having lost the ability to couple anaerobic elemental sulfur oxidation with ferric iron reduction
Language English Country France Media print-electronic
Document type Comparative Study, Journal Article
PubMed
27394989
DOI
10.1016/j.resmic.2016.06.009
PII: S0923-2508(16)30071-7
Knihovny.cz E-resources
- Keywords
- Acidithiobacillus ferrooxidans, Anaerobic respiratory pathway, Ferric iron reduction, Proteomics, Sulfur metabolism,
- MeSH
- Electrophoresis, Gel, Two-Dimensional MeSH
- Acidithiobacillus chemistry genetics metabolism MeSH
- Anaerobiosis MeSH
- Bacterial Proteins analysis MeSH
- Mutation MeSH
- Oxidation-Reduction MeSH
- Proteome analysis MeSH
- Sulfur metabolism MeSH
- Gene Expression Profiling MeSH
- Tandem Mass Spectrometry MeSH
- Iron metabolism MeSH
- Publication type
- Journal Article MeSH
- Comparative Study MeSH
- Names of Substances
- Bacterial Proteins MeSH
- Proteome MeSH
- Sulfur MeSH
- Iron MeSH
In extremely acidic environments, ferric iron can be a thermodynamically favorable electron acceptor during elemental sulfur oxidation by some Acidithiobacillus spp. under anoxic conditions. Quantitative 2D-PAGE proteomic analysis of a resting cell suspension of a sulfur-grown Acidithiobacillus ferrooxidans CCM 4253 subculture that had lost its iron-reducing activity revealed 147 protein spots that were downregulated relative to an iron-reducing resting cell suspension of the antecedent sulfur-oxidizing culture and 111 that were upregulated. Tandem mass spectrometric analysis of strongly downregulated spots identified several physiologically important proteins that apparently play roles in ferrous iron oxidation, including the outer membrane cytochrome Cyc2 and rusticyanin. Other strongly repressed proteins were associated with sulfur metabolism, including heterodisulfide reductase, thiosulfate:quinone oxidoreductase and sulfide:quinone reductase. Transcript-level analyses revealed additional downregulation of other respiratory genes. Components of the iron-oxidizing system thus apparently play central roles in anaerobic sulfur oxidation coupled with ferric iron reduction in the studied microbial strain.
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