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  • Thiosulphate oxidation  (2)
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Chemolithotrophic ATP synthesis and NAD(P) reduction in Thiobacillus tepidarius and T. versutus (1988)
    Springer
    Archives of microbiology 149 (1988), S. 303-307 
    Details
    ISSN: 1432-072X
    Keywords: Thiobacillus tepidarius ; Thiobacillus versutus ; ATP synthesis ; NAD(P) reduction ; Thiosulphate oxidation ; Proton potential (Δp)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thiosulphate-dependent reduction of NAD and NADP in intact cells of Thiobacillus tepidarius and T. versutus was severely inhibited or abolished by FCCP at concentrations that did not affect ATP synthesis over the same time scale. Thiosulphate-dependent ATP synthesis in T. tepidarius was abolished by the ATPase inhibitor DCCD, which did not affect NAD or NADP reduction at the concentrations tested. These results indicate that energy-dependent NAD(P) reduction using reversal of electron transfer from cytochrome b or c in thiobacilli is directly driven by the Δp generated by thiosulphate oxidation, and does not require the participation of ATP. While NAD(P) reduction and ATP synthesis are thus both effected by sulphur compound oxidation, there is no obligatory link between them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411646
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  • 2
    Electronic Resource
    Electronic Resource
    Respiration-driven proton translocation in Thiobacillus versutus and the role of the periplasmic thiosulphate-oxidizing enzyme system (1988)
    Springer
    Archives of microbiology 149 (1988), S. 297-302 
    Details
    ISSN: 1432-072X
    Keywords: Thiobacillus versutus ; Proton translocation ; Thiosulphate oxidation ; Sulphite oxidation ; Periplasmic proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The periplasmic location of enzymes A and B of the thiosulphate-oxidizing multienzyme system of Thiobacillus versutus has been further confirmed by differential radiolabelling of periplasmic and cytoplasmic proteins. The stoichiometries of respiration-driven proton translocation in T. versutus were determined using the oxygen pulse and the initial rate methods. A value for the →H+/O quotient (number of protons translocated per oxygen atom reduced) of about 2.8 was found for the oxidation of thiosulphate, and of about 2.5 for sulphite. The →H+/O quotient for endogenous respiration was about 5.7. The data are shown to be in good agreement with the scheme proposed previously for thiosulphate oxidation by this organism. Proton generation during the oxidation of thiosulphate or sulphite is indicated to occur in the periplasm rather than by pumping across the cytoplasmic membrane. The results also suggest that a →H+/O quotient of six occurs during NADH oxidation (from endogenous metabolism measurements) and that the terminal cytochrome oxidase, aa3, does not function as a proton pump.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411645
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
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