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    Gene regulatory and metabolic adaptation processes of Dinoroseobacter shibae DFL12T during oxygen depletion.

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    Authors
    Laass, Sebastian
    Kleist, Sarah
    Bill, Nelli
    Drüppel, Katharina
    Kossmehl, Sebastian
    Wöhlbrand, Lars
    Rabus, Ralf
    Klein, Johannes
    Rohde, Manfred
    Bartsch, Annekathrin
    Wittmann, Christoph
    Schmidt-Hohagen, Kerstin
    Tielen, Petra
    Jahn, Dieter
    Schomburg, Dietmar
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    Issue Date
    2014-05-09
    
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    Abstract
    Metabolic flexibility is the key to the ecological success of the marine Roseobacter clade bacteria. We investigated the metabolic adaptation and the underlying changes in gene expression of Dinoroseobacter shibae DFL12(T) to anoxic life by a combination of metabolome, proteome, and transcriptome analyses. Time-resolved studies during continuous oxygen depletion were performed in a chemostat using nitrate as the terminal electron acceptor. Formation of the denitrification machinery was found enhanced on the transcriptional and proteome level, indicating that D. shibae DFL12(T) established nitrate respiration to compensate for the depletion of the electron acceptor oxygen. In parallel, arginine fermentation was induced. During the transition state, growth and ATP concentration were found to be reduced, as reflected by a decrease of A578 values and viable cell counts. In parallel, the central metabolism, including gluconeogenesis, protein biosynthesis, and purine/pyrimidine synthesis was found transiently reduced in agreement with the decreased demand for cellular building blocks. Surprisingly, an accumulation of poly-3-hydroxybutanoate was observed during prolonged incubation under anoxic conditions. One possible explanation is the storage of accumulated metabolites and the regeneration of NADP(+) from NADPH during poly-3-hydroxybutanoate synthesis (NADPH sink). Although D. shibae DFL12(T) was cultivated in the dark, biosynthesis of bacteriochlorophyll was increased, possibly to prepare for additional energy generation via aerobic anoxygenic photophosphorylation. Overall, oxygen depletion led to a metabolic crisis with partly blocked pathways and the accumulation of metabolites. In response, major energy-consuming processes were reduced until the alternative respiratory denitrification machinery was operative.
    Citation
    Gene regulatory and metabolic adaptation processes of Dinoroseobacter shibae DFL12T during oxygen depletion. 2014, 289 (19):13219-31 J. Biol. Chem.
    Affiliation
    Helmholtz-Zentrum für Infektionsforschung, Inhoffenstr. 7, 38124 Braunschweig, Germany.
    Journal
    The Journal of biological chemistry
    URI
    http://hdl.handle.net/10033/621020
    DOI
    10.1074/jbc.M113.545004
    PubMed ID
    24648520
    Type
    Article
    Language
    en
    ISSN
    1083-351X
    ae974a485f413a2113503eed53cd6c53
    10.1074/jbc.M113.545004
    Scopus Count
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    publications of the department Central Unit of Microscopy [ZEIM]

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