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  • 1
    Electronic Resource
    Electronic Resource
    Energetic aspects of CO2 uptake in Thiobacillus neapolitanus (1987)
    Springer
    Archives of microbiology 147 (1987), S. 285-290 
    Details
    ISSN: 1432-072X
    Keywords: Electrochemical proton gradient ; ΔΨ ; Electron transfer ; CO2 uptake ; thiobacillus neapolitanus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uptake of inorganic carbon (Ci) in the form of CO2 and/or HCO 3 - was studied in the chemolithoautotroph Thiobacillus neapolitanus under energy (thiosulphate) or carbon (CO2) limitation. Uptake of C1 was found to be a metabolic energy dependent process since in the presence of uncouplers no uptake was observed. The accumulation level of Ci was higher in the CO2-limited cells (1000-to 1500-fold) in comparison to the thiosulphate-limited cells (500-to 800-fold). The process of uptake could be influenced by addition of ionophores. Inhibition of uptake and accumulation of Ci was found after addition of valinomycin which completely dissipated the electrical potential (ΔΨ). After addition of nigericin an increase in the uptake and accumulation of Ci was observed with a concomitant increase of the ΔΨ. These results suggest that the ΔΨ is the main driving force for uptake of Ci. However, uptake of Ci could never be found in the absence of electron transfer, or in cells in which the electron transfer chain was blocked by potassium cyanide. Electron transfer therefore appears to be an additional requirement for Ci uptake. Kinetic experiment on the uptake of inorganic carbon at different pH values suggest that CO2 is the carbon species taken up by T. neapolitanus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463489
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  • 2
    Electronic Resource
    Electronic Resource
    Relations between d-ribulose-1,5-bisphosphate carboxylase, carboxysomes and CO2 fixing capacity in the obligate chemolithotroph Thiobacillus neapolitanus grown under different limitations in the chemostat (1980)
    Springer
    Archives of microbiology 124 (1980), S. 185-189 
    Details
    ISSN: 1432-072X
    Keywords: Carboxysomes ; d-Ribulose-1,5-bisphosphate carboxylase ; CO2 fixing capacity ; Thiobacillus neapolitanus ; Chemolithotroph ; Autotroph
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An adaptation of the d-ribulose-1,5-bisphosphate carboxylase (RuBPCase) activity to changing CO2 concentrations in the growth medium in the chemostat was observed in the obligate chemolithotroph Thiobacillus neapolitanus. RuBPCase activity has been separated in a soluble and particulate fraction. The activity of the particulate fraction appeared to be associated with the carboxysomes. The total activity of RuBPCase of CO2 limited cultures was about 5-fold higher than the activity of thiosulphate limited cultures grown in the presence of 5% CO2 whilst the particulate activity and the soluble activity were about 8- and 1.5-fold higher, respectively. The fluctuation of the total and particulate RuBPCase activity correlated with the changes in volume density of carboxysomes in the cell. An inverse correlation between maximal CO2 fixing capacity by whole cells and the volume density of carboxysomes was observed. The change in ratio of soluble RuBPCase activity to particulate RuBPCase activity paralleled the change in maximal CO2 fixation by whole cells during the different growth conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427725
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