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Query: EC:4.1.1.49 (
phosphoenolpyruvate carboxykinase
)
4,654
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
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.
...
PMID:Anapleurotic CO(2) Fixation by Phosphoenolpyruvate Carboxylase in C(3) Plants. 1666 5
