Journal Article

Calcium-Dependent and -Independent Phospho<i>enol</i>pyruvate Carboxylase Kinases in <i>Sorghum</i> Leaves: Further Evidence for the Involvement of the Calcium-Independent Protein Kinase in the in situ Regulatory Phosphorylation of C<sub>4</sub> Phospho<i>enol</i>pyruvate Carboxylase

Mohamed Nhiri, Naïma Bakrim, Valérie Pacquit, Zakia El Hachimi-Messouak, Lidia Osuna and Jean Vidal

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 2, pages 241-46
Published in print February 1998 | ISSN: 0032-0781
Published online February 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029363
Calcium-Dependent and -Independent Phosphoenolpyruvate Carboxylase Kinases in Sorghum Leaves: Further Evidence for the Involvement of the Calcium-Independent Protein Kinase in the in situ Regulatory Phosphorylation of C4 Phosphoenolpyruvate Carboxylase

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Calcium-dependent phosphoenolpyruvate carboxylase protein kinase was copurified with C4 phosphoenolpyruvate carboxylase (C4 PEPC) from illuminated Sorghum leaves during purification by various procedures. Isolated mesophyll cell protoplasts contained both calcium-dependent and -independent protein kinases. The latter was induced by light and weak bases and was found to be the major protein kinase phosphorylating C4 PEPC in the mesophyll.

Keywords: C4 phosphoenolpyruvate carboxylase (EC 4.1.1.31); C4 photosynthesis; Protein kinases; Protoplasts; Sorghum vulgare

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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