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  • 1
    Digitale Medien
    Digitale Medien
    Transposition of IST2 in Thiobacillus ferrooxidans (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 12 (1994), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: The genome of Thiobacillus ferrooxidans contains at least two different repetitive DNA elements. One of these elements, termed IS T2 has been sequenced and shown to exhibit the characteristics of a typical prokaryotic insertion sequence. Furthermore, preliminary evidence has implicated IS T2 in genomic rearrangements, although the mechanism of rearrangement, whether by transposition or recombination, has not been established. In this report we provide evidence from detailed restriction enzyme analyses and DNA sequencing data that support a model of transposition, consistent with the notion that IS T2 is a mobile insertion sequence.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2958.1994.tb01005.x
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  • 2
    Digitale Medien
    Digitale Medien
    IST1 insertional inactivation of the resB gene: implications for phenotypic switching in Thiobacillus ferrooxidans (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 175 (1999), S. 0 
    Details
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Thiobacillus ferrooxidans ATCC 19859 undergoes rapid phenotypic switching between a wild-type state characterized by the ability to oxidize ferrous iron (FeII) and reduced sulfur compounds and a mutant state where it has lost the capacity to oxidize FeII but retains the ability to oxidize sulfur. The mutant has also gained the capacity to swarm. It is proposed that loss of FeII oxidation is due to the reversible transposition of the insertion sequence IST1 into resB encoding a putative cytochrome c-type biogenesis protein. Downstream from resB and co-transcribed with it is resC, encoding another putative cytochrome biogenesis protein. IST1 insertional inactivation of resB could result in the loss of activity of its target c-type cytochrome(s). This putative target cytochrome(s) is proposed to be essential for FeII oxidation but not for sulfur oxidation. Curiously, resB and resC pertain to the proposed system II cytochrome biogenesis pathway whereas γ Proteobacteria, of which T. ferrooxidans is a member, normally use system I. This could represent an example of lateral gene transfer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1574-6968.1999.tb13624.x
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  • 3
    Digitale Medien
    Digitale Medien
    Iron Homeostasis Strategies in Acidophilic Iron Oxidizers: Comparative Genomic Analyses (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 20-21 (July 2007), p. 531-534 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: An understanding of the physiology and metabolic complexity of microbial consortiainvolved in metal solubilization is a prerequisite for the rational improvement of bioleachingtechnologies. Among the most challenging aspects that remain to be addressed is how aerobicacidophiles, especially Fe(II)-oxidizers, contend with the paradoxical hazards of iron overload andiron deficiency, each with deleterious consequences for growth. Homeostatic mechanismsregulating the acquisition, utilization/oxidation, storage and intracellular mobilization of cellulariron are deemed to be critical for fitness and survival of bioleaching microbes. In an attempt tocontribute to the comprehensive understanding of the biology and ecology of the microbialcommunities in bioleaching econiches, we have used comparative genomics and other bioinformatictools to reconstruct the iron management strategies in newly sequenced acidithiobacilli and otherbiomining genomes available in public databases.Species-specific genes have been identified with distinctive functional roles in ironmanagement as well as genes shared by several species in biomining consortia. Their analysiscontributes to our understanding of the general survival strategies in acidic and iron loadedenvironments and suggests functions for genes with currently unknown functions that might revealnovel aspects of iron response in acidophiles. Comprehensive examination of the occurrence andconservation of regulatory functions and regulatory sites also allowed the prediction of the metalregulatory networks for these biomining microbes
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.531.pdf
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