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. 1970 May;102(2):341–346. doi: 10.1128/jb.102.2.341-346.1970

Carbon Dioxide Fixation by Extracts of Streptococcus faecalis var. liquefaciens

Ronald E Hartman a,1
PMCID: PMC247556  PMID: 4986758

Abstract

Extracts of cells of Streptococcus faecalis var. liquefaciens strain 31 incorporated 14CO2 into aspartate. Dialyzed extracts produced radioactive oxalacetate in the absence of exogenously added glutamate and pyridoxal-5′-phosphate and produced radioactive aspartate in the presence of these components. Reduced nicotinamide adenine dinucleotide or reduced nicotinamide adenine dinucleotide phosphate could not be substituted for adenosine triphosphate (ATP); phosphoenolpyruvate even in the presence of nucleoside diphosphates could not replace pyruvate plus ATP; propionate plus coenzyme A (CoA) could not replace pyruvate in supporting CO2 fixation by cell extracts. Fixation by dialyzed cell extracts required pyruvate, ATP, MgSO4, and was stimulated by biotin, KCl, 2-mercaptoethanol, CoA, and acetyl CoA. Inhibition of fixation occurred when avidin, NaCl, oxalacetate, or aspartate was added to dialyzed extracts. On the basis of the products formed and the effects of substrates and cofactors on the fixation reaction, it was concluded that pyruvate carboxylase is responsible for CO2 fixation in this microorganism.

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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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