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. 1990 Nov;94(3):1496–1500. doi: 10.1104/pp.94.3.1496

d-Glucosone and l-Sorbosone, Putative Intermediates of l-Ascorbic Acid Biosynthesis in Detached Bean and Spinach Leaves 1

Kazumi Saito 1,2, Jerry A Nick 1, Frank A Loewus 1
PMCID: PMC1077406  PMID: 16667861

Abstract

d-[6-14C]Glucosone that had been prepared enzymically from d-[6-14C]glucose was used to compare relative efficiencies of these two sugars for l-ascorbic acid (AA) biosynthesis in detached bean (Phaseolus vulgaris L., cv California small white) apices and 4-week-old spinach (Spinacia oleracea L., cv Giant Noble) leaves. At tracer concentration, 14C from glucosone was utilized by spinach leaves for AA biosynthesis much more effectively than glucose. Carbon-14 from [6-14C]glucose underwent considerable redistribution during AA formation, whereas 14C from [6-14C]glucosone remained almost totally in carbon 6 of AA. In other experiments with spinach leaves, l-[U-14C]sorbosone was found to be equivalent to [6-14C]glucose as a source of 14C for AA. In the presence of 0.1% d-glucosone, conversion of [6-14C] glucose into labeled AA was greatly repressed. In a comparable experiment with l-sorbosone replacing d-glucosone, the effect was much less. The experiments described here give substance to the proposal that d-glucosone and l-sorbosone are putative intermediates in the conversion of d-glucose to AA in higher plants.

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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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