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  • 1
    Electronic Resource
    Electronic Resource
    Regulation of glucose catabolism in Thiobacillus A2 grown in the chemostat under dual limitation by succinate and glucose (1980)
    Springer
    Archives of microbiology 128 (1980), S. 91-97 
    Details
    ISSN: 1432-072X
    Keywords: Thiobacillus A2 ; Chemostat culture ; Glucose oxidation ; Succinate metabolism ; Dual substrate limitation ; Metabolic regulation ; Radiorespirometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In contrast to its diauxic behaviour in batch culture, Thiobacillus A2 grew in chemostat culture using glucose and succinate as dual limiting substrates. Biomass production under dual limitations was the sum of that on single substrates with each substrate being oxidized and assimilated to similar extents in single and dual substrate-limited cultures. In glucose and glucose + succinate-limited cultures glucose was oxidized largely by the Entner-Doudoroff and pentose phosphate pathways, but other mechanisms also contributed and the ratios of pathways depended on substrate ratios and the previous substrate-history of the culture. Variations in specific activities of enzymes of carbohydrate metabolism following switches from single to mixed substrates were considerable, ranging from fourfold for fructose diphosphate aldolase to more than 200-fold for hexokinase, fructose diphosphatase, glucose 6-phosphate and 6-phosphogluconate dehydrogenases. Changes in specific activities occurred only over prolonged time periods in the chemostat, probably reflecting low concentrations of free substrates in carbon-limited cultures and consequent low levels of catabolite repression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422311
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  • 2
    Electronic Resource
    Electronic Resource
    Autotrophic growth of four Sulfolobus strains on tetrathionate and the effect of organic nutrients (1987)
    Springer
    Archives of microbiology 146 (1987), S. 382-389 
    Details
    ISSN: 1432-072X
    Keywords: Sulfolobus ; Chemolithotrophy ; Autotrophy ; Tetrathionate oxidation ; Glucose oxidation ; CO2-fixation enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Autotrophic growth yields of four strains of Sulfolobus using tetrathionate as sole energy substrate fell in the range 6.2–7.8 g dry weight (mol tetrathionate oxidized)-1. Autotrophic organisms lacked ribulose 1,5-bis-phosphate carboxylase, but contained pyruvate and phosphoenolpyruvate carboxylases. S. brierleyi and strains B6-2 and LM exhibited mixotrophic growth, with tetrathionate oxidation, CO2-fixation and organic substrate assimilation occurring concurrently, using media containing glucose or acetate. Yeast extract or succinate supported heterotrophic growth and showed strain-dependent repression of one or both of tetrathionate oxidation and CO2-fixation resulting in biphasic growth. All four carbon atoms of succinate were assimilated to cell-carbon during growth. Acetate was the major source of cell-carbon during mixotrophic growth. These observations are not inconsistent with the possibility of a reductive carboxylic acid cycle in these organisms. Radiorespirometric analysis of glucose oxidation indicated CO2 release to occur by means of an Entner-Doudoroff pathway (followed by pyruvate decarboxylation) and oxidative pentose phosphate pathway reactions. There was little evidence from the glucose radiorespirometry of the large-scale use of an oxidative tricarboxylic acid cycle for terminal oxidation of acetate derived from pyruvate. These results demonstrate the considerable metabolic versatility of Sulfolobus strains and show that there is significant variation among them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410940
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