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. 1991 Oct;57(10):3013–3019. doi: 10.1128/aem.57.10.3013-3019.1991

Influence of CO2-HCO3− Levels and pH on Growth, Succinate Production, and Enzyme Activities of Anaerobiospirillum succiniciproducens

N S Samuelov 1,2,3,†, R Lamed 1,2,3,‡, S Lowe 1,2,3, J G Zeikus 1,2,3,*
PMCID: PMC183913  PMID: 16348570

Abstract

Growth and succinate versus lactate production from glucose by Anaerobiospirillum succiniciproducens was regulated by the level of available carbon dioxide and culture pH. At pH 7.2, the generation time was almost doubled and extensive amounts of lactate were formed in comparison with growth at pH 6.2. The succinate yield and the yield of ATP per mole of glucose were significantly enhanced under excess-CO2-HCO3− growth conditions and suggest that there exists a threshold level of CO2 for enhanced succinate production in A. succiniciproducens. Glucose was metabolized via the Embden-Meyerhof-Parnas route, and phosphoenolpyruvate carboxykinase levels increased while lactate dehydrogenase and alcohol dehydrogenase levels decreased under excess-CO2-HCO3− growth conditions. Kinetic analysis of succinate and lactate formation in continuous culture indicated that the growth rate-linked production rate coefficient (K) cells was much higher for succinate (7.2 versus 1.0 g/g of cells per h) while the non-growth-rate-related formation rate coefficient (K′) was higher for lactate (1.1 versus 0.3 g/g of cells per h). The data indicate that A. succiniciproducens, unlike other succinate-producing anaerobes which also form propionate, can grow rapidly and form high final yields of succinate at pH 6.2 and with excess CO2-HCO3− as a consequence of regulating electron sink metabolism.

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Selected References

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