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. 1972 Jul;111(1):98–102. doi: 10.1128/jb.111.1.98-102.1972

De Novo Biosynthesis of Nicotinamide Adenine Dinucleotide in Escherichia coli: Excretion of Quinolinic Acid by Mutants Lacking Quinolinate Phosphoribosyl Transferase1

Jerry Lr Chandler a,2, R K Gholson a
PMCID: PMC251245  PMID: 4360223

Abstract

The excretion of quinolinic acid was studied in growing and resting cells of Escherichia coli K-12 nadC13. Under optimal conditions, this organism could synthesize quinolinic acid in several-fold excess of the amount which would be required for normal growth. The excretion of quinolinic acid was controlled by the concentration of nicotinamide adenine dinucleotide (NAD) precursors available to the organism either during growth or during incubation in dense cell suspensions. These observations suggest that biosynthesis of NAD de novo is regulated by both repression and feedback inhibition. Analogues of niacin which inhibit bacterial growth also inhibited and repressed the synthesis (excretion) of quinolinic acid. The pH optimum for quinolinic acid excretion agreed favorably with the optimum observed for its synthesis in vitro. The rate of quinolinic acid excretion was strongly influenced by the concentration of ribose or glycerol in the medium.

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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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