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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.
MedLine Citation:
PMID:  16662659     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
M Grün; B Renstrøm; F A Loewus
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  70     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1982 Nov 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1233-5     Citation Subset:  -    
Affiliation:
Institute of Biological Chemistry and the Biochemistry/Biophysics Program, Washington State University, Pullman, Washington 99164-6340.
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