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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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| Authors: | Nhiri, Mohamed Bakrim, Naima Pacquit, Valerie Hachimi-Messouak, Zakia El Osuna, Lidia Vidal, Jean |
| Affiliation: | 1 Laboratoire de Biochimie, Département de Biologie, Université Med V. Rabat Morocco 2 Département de Biologie, Faculté des Sciences, Université A. Essâdi. Tétouan Morocco 3 Laboratoire de Biologie moléculaire des Relations Plantes-Microorganismes, CNRS-INRA BP 27, 31326 Castanet-Tolosan Cedex France 4 Laboratorio de Fisiologia Vegetal, Departamento de Biologia Vegetal, Facultad de Biologia Sevilla, Spain 5 Institut de Biotechnologie des Plantes, bât. 630, ERS CNRS (Centre National de la Recherche Scientifique) 569, Université de Paris-Sud, Centre d'Orsay 91405 ORSA Y Cedex, France |
| Abstract: | Calcium-dependent phosphoenolpyruvate carboxylase protein kinasewas copurified with C4 phosphoenolpyruvate carboxylase (C4 PEPC)from illuminated Sorghum leaves during purification by variousprocedures. Isolated mesophyll cell protoplasts contained bothcalcium-dependent and -independent protein kinases. The latterwas induced by light and weak bases and was found to be themajor protein kinase phosphorylating C4 PEPC in the mesophyll. (Received July 29, 1997; Accepted November 28, 1997) |
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