| Loss of Hydrogen from Carbon 5 of d-Glucose during Conversion of d-[5-H,6-C]Glucose to l-Ascorbic Acid in Pelargonium crispum (L.) L'Hér. | |
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MedLine Citation:
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PMID: 16662659 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Conversion of d-[5-(3)H,6-(14)C]glucose to l-ascorbic acid in detached apices of Pelargonium crispum (L.) L'Hér cv Prince Rupert (lemon geranium) was accompanied by complete loss of tritium in the product. Chemical degradation of d-glucose which was recovered from the labeled apices yielded d-glyceric acid (corresponding to carbons 4, 5, and 6 of glucose) with a (3)H:(14)C ratio of 4 to be compared with 9, the ratio in d-[5-(3)H,6-(14)C]glucose initially. Conversion of d-[6-(3)H,6-(14)C]glucose in the same tissue was accompanied by retention of tritium in l-ascorbic acid with a (3)H:(14)C ratio comparable to that of compounds from the hexose pool. Results indicate that during l-ascorbic acid biosynthesis from glucose in Pelargonium crispum hydrogen at carbon 5 undergoes exchange with the medium, suggesting an epimerization at this carbon atom. |
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Authors:
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M Grün; B Renstrøm; F A Loewus |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Plant physiology Volume: 70 ISSN: 0032-0889 ISO Abbreviation: Plant Physiol. Publication Date: 1982 Nov |
Date Detail:
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Created Date: 2010-06-29 Completed Date: 2010-06-29 Revised Date: 2010-09-15 |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1233-5 Citation Subset: - |
Affiliation:
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Institute of Biological Chemistry and the Biochemistry/Biophysics Program, Washington State University, Pullman, Washington 99164-6340. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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