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. 1973 May;114(2):743–751. doi: 10.1128/jb.114.2.743-751.1973

Fermentation of Glucose, Fructose, and Xylose by Clostridium thermoaceticum: Effect of Metals on Growth Yield, Enzymes, and the Synthesis of Acetate from CO2

Jan R Andreesen a,1, Annabella Schaupp a, Chris Neurauter a, Ann Brown a, Lars G Ljungdahl a
PMCID: PMC251835  PMID: 4706193

Abstract

Clostridium thermoaceticum ferments xylose, fructose, and glucose with acetate as the only product. In fermentations with mixtures of the sugars, xylose is first fermented, then fructose, and last, glucose. Fructose inhibits the fermentation of glucose, and this inhibition appears to be due to a repression of the synthesis of an enzyme needed for glucose utilization. Addition of metals to the culture medium increases the cell yield drastically from about 7 to 18 g per liter, and Y(glucose) values between 40 and 50 are obtained. According to the postulated pathways of the fermentation of glucose and synthesis of acetate from CO2 by C. thermoaceticum, 3 mol of ATP are available as energy for growth. Thus a Y(adenosine 5′-triphosphate) of 13 to 16 is obtained. Because the normal Y(ATP) value is 10.5, this could mean that an additional source of ATP is available by an unknown mechanism. The addition of metals also increases the nicotinamide adenine dinucleotide phosphate-dependent formate dehydrogenase activity, the overall reaction (14CO2 → acetate), and the incorporation of the methyl group of 5-methyltetrahydrofolate into acetate. These reactions are catalyzed very efficiently by cells harvested in early growth, whereas cells obtained at the end of a fermentation have very low formate dehydrogenase activity and capacity to incorporate CO2 into acetate. The following enzymes involved in the synthesis of acetate from CO2 and in the metabolism of pyruvate are present in extracts of C. thermoaceticum: 10-formyltetrahydrofolate synthetase, 5,10-methenyltetrahydrofolate cyclohydrolase, 5,10-methylenetetrahydrofolate dehydrogenase, 5,10-methylenetetrahydrofolate reductase, phosphate acetyltransferase, and acetate kinase. These enzymes are not or are very little affected by the addition of metals to the growth medium.

The amount of corrinoids in cells from early growth is low, whereas it is high in cells harvested late in growth. The opposite is found for the activity of δ-aminolevulinate dehydratase, which is high at the beginning of growth and low at the end.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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