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Chemostat culture of Bacillus caldotenax at 65°C: Activity and regulation of the main metabolic pathways

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Abstract

Bacillus caldotenax was cultivated in chemostat experiments at 65°C with a chemically defined minimal medium. Glycolysis, tricarboxylic acid cycle, pentose phosphate pathway and the respiratory chain were active as demonstrated by measuring the corresponding enzymes. No enzyme activity of the Entner-Doudoroff pathway could be detected. The specific activities of the citrate cycle enzymes were up to 10 times higher as compared to the enzymes of glycolysis. At dilution rates between 0.3 and 2.2 h-1 none of the main metabolic pathways was regulated. In contrast the isocitrate lyase was regulated (drop of activity with increasing growth rates). As a result of a batch culture with glucose and acetate as carbon sources a regulation model was proposed: glucose, or a metabolite of glucose, represses the isocitrate lyase; in the absence of glucose acetate acts as an inducer.

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Abbreviations

DCIP:

dichlorphenol indophenol

ED:

Entner-Doudoroff pathway

EMP:

Emden-Meyerhof-Parnas pathway

ICL:

isocitrate lyase

PP:

pentose phosphate pathway

TCC:

tricarbonic acid cycle

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Authors and Affiliations

  1. Swiss Federal Institute of Technology, CH-8092, Zürich

    U. Friederich (Chair of Microbiology), H. J. Kuhn, H. M. Fischer & A. Fiechter

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  1. U. Friederich
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  2. H. J. Kuhn
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  3. H. M. Fischer
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  4. A. Fiechter
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Friederich, U., Kuhn, H.J., Fischer, H.M. et al. Chemostat culture of Bacillus caldotenax at 65°C: Activity and regulation of the main metabolic pathways. Arch. Microbiol. 124, 13–20 (1980). https://doi.org/10.1007/BF00407023

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