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  • 1
    Electronic Resource
    Electronic Resource
    Oxidative phosphorylation in Zymomonas mobilis (1993)
    Springer
    Archives of microbiology 160 (1993), S. 74-79 
    Details
    ISSN: 1432-072X
    Keywords: Zymomonas mobilis ; Oxidative phosphorylation ; membrane vesicles ; ATP synthesis ; transmembrane pH gradient ; 31P-NMR ; Acetaldehyde ; Ethanol metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The obligately fermentative aerotolerant bacterium Zymomonas mobilis was shown to possess oxidative phosphorylation activity. Increased intracellular ATP levels were observed in aerated starved cell suspension in the presence of ethanol or acetaldehyde. Ethanolconsuming Z. mobilis generated a transmembrane pH gradient. ATP synthesis in starved Z. mobilis cells could be induced by external medium acidification of 3.5–4.0 pH units. Membrane vesicles of Z. mobilis coupled ATP synthesis to NADH oxidation. ATP synthesis was sensitive to the protonophoric uncoupler CCCP both in starved cells and in membrane vesicles. The H+-ATPase inhibitor DCCD was shown to inhibit the NADH-coupled ATP synthesis in membrane vesicles. The physiological role of oxidative phosphorylation in this obligately fermentative bacterium is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258148
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum to “electron transport chain in aerobically cultivated Zymomonas mobilis” [FEMS microbiol. lett. 143 (1996) 185–189] (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 144 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08542.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electron transport chain in aerobically cultivated Zymomonas mobilis (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 143 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Respiratory chain composition and energy coupling in cytoplasmic membrane of Zymomonas mobilis was shown to depend on culture aeration. Aerobically grown cells contained mainly the non-energy-generating NADH dehydrogenase with kM for NADH 58 mM. In anaerobically cultivated bacteria, the energy-coupling NADH dehydrogenase complex with km for NADH 7 mM predominated. In aerobically cultivated Z. mobilis, CoQ content and absorption peaks of cytochromes at 554–556 nm and 525–528 nm were significantly increased. Energy-coupling site I, linked to the NADH:CoQ oxidoreductase complex, could be eliminated under sulfate-déficient cultivation conditions. For anaerobically grown cells this resulted in loss of oxidative phosphorylation activity, while in aerobically grown cells energy coupling was not affected. These findings indicate a shift of energy coupling from site I to the cytochrome region of the respiratory chain in Z. mobilis under transition from anaerobic to aerobic growth conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08478.x
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  • 4
    Electronic Resource
    Electronic Resource
    Energy coupling sites in the electron transport chain of Zymomonas mobilis (1995)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 133 (1995), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Energy-coupling sites in the electron transport chain of the obligately fermentative aerotolerant bacterium Zymomonas mobilis were examined. The H+ /O stoichiometry of the electron transport chain in intact bacteria oxidizing ethanol was close to 3.3. Cytoplasmic membrane vesicles coupled NADH oxidation to ATP synthesis. With ascorbate/phenazine methosulfate they showed oxygen uptake which was sensitive to antimycin A, but no significant ATP synthesis could be detected. Cells with a defective coupling site I, prepared by cultivation on a sulfate-deficient medium, showed a decreased rotenone sensitivity of respiration, and they lacked almost all the respiration-driven proton translocation and ATP synthesis. We conclude that, despite the reported composition of the electron transport chain, only energy coupling site 1 was functional in Z. mobilis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1995.tb07868.x
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    Paper (German National Licenses)
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