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Anapleurotic CO(2) Fixation by Phosphoenolpyruvate Carboxylase in C(3) Plants.
MedLine Citation:
PMID:  16665405     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The role of phosphoenolpyruvate carboxylase in photosynthesis in the C(3) plant Nicotiana tabacum has been probed by measurement of the (13)C content of various materials. Whole leaf and purified ribulose bisphosphate carboxylase are within the range expected for C(3) plants. Aspartic acid purified following acid hydrolysis of this ribulose bisphosphate carboxylase is enriched in (13)C compared to whole protein. Carbons 1-3 of this aspartic acid are in the normal C(3) range, but carbon-4 (obtained by treatment of the aspartic acid with aspartate beta-decarboxylase) has an isotopic composition in the range expected for products of C(4) photosynthesis (-5 per thousand), and it appears that more than half of the aspartic acid is synthesized by phosphoenolpyruvate carboxylase using atmospheric CO(2)/HCO(3) (-). Thus, a primary role of phosphoenolpyruvate carboxylase in C(3) plants appears to be the anapleurotic synthesis of four-carbon acids.
Authors:
E Melzer; M H O'leary
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  84     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1987 May 
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:  58-60     Citation Subset:  -    
Affiliation:
Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706.
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