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. 1974 Apr;53(4):603–609. doi: 10.1104/pp.53.4.603

Activation of the de Novo Pathway for Pyridine Nucleotide Biosynthesis Prior to Ricinine Biosynthesis in Castor Beans 1

David F Mann a,2, Richard U Byerrum a
PMCID: PMC541404  PMID: 16658750

Abstract

The ricinine content of etiolated seedlings of Ricinus communis increased nearly 12-fold over a 4-day period. In plants quinolinic acid is an intermediate in the de novo pathway for the synthesis of pyridine nucleotides. The only known enzyme in the de novo pathway for pyridine nucleotide biosynthesis, quinolinic acid phosphoribosyltransferase, increased 6-fold in activity over a 4-day period which preceded the onset of ricinine biosynthesis by 1 day. The activity of the remainder of the pyridine nucleotide cycle enzymes in the seedlings, as monitored by the specific activity of nicotinic acid phosphoribosyltransferase and nicotinamide deamidase, was similar to that found in the mature green plant. In the roots of Nicotiana rustica, where the pyridine alkaloid nicotine is synthesized, the level of quinolinic acid phosphoribosyltransferase was 38-fold higher than the level of nicotinic acid phosphoribosyltransferase, whereas in most other plants examined, the specific activity of quinolinic acid phosphoribosyltransferase was similar to the level of activity of enzymes in the pyridine nucleotide cycle itself. A positive correlation therefore exists between the specific activity of a de novo pathway enzyme catalyzing pyridine nucleotide biosynthesis in Ricinus communis and Nicotiana rustica and the biosynthesis of ricinine and nicotine, respectively.

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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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