Anapleurotic CO2 Fixation by Phosphoenolpyruvate Carboxylase in C3 Plants | Zendy

E. W. Melzer | Zendy; M. H. O'LEARY | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Anapleurotic CO₂ Fixation by Phosphoenolpyruvate Carboxylase in C₃ Plants

Author(s) -

E. W. Melzer,

M. H. O'LEARY

Publication year - 1987

Publication title -

plant physiology

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.84.1.58

Subject(s) - phosphoenolpyruvate carboxylase , carbon fixation , pyruvate carboxylase , chemistry , fixation (population genetics) , phosphoenolpyruvate carboxykinase , photosynthesis , botany , biochemistry , biology , enzyme , gene

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.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research