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The impact of PEPC phosphorylation on growth and development of Arabidopsis thaliana : Molecular and physiological characterization of PEPC kinase mutants
Author(s) -
Meimoun Patrice,
Gousset-Dupont Aurélie,
Lebouteiller Bénédicte,
Ambard-Bretteville Françoise,
Besin Evelyne,
Lelarge Caroline,
Mauve Caroline,
Hodges Michael,
Vidal Jean
Publication year - 2009
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2009.04.030
Subject(s) - phosphoenolpyruvate carboxylase , arabidopsis thaliana , biochemistry , mutant , arabidopsis , biology , phosphorylation , kinase , gene , crassulacean acid metabolism , photosynthesis
Two phosphoenolpyruvate carboxylase (PEPC) kinase genes ( PPCk1 and PPCk2 ) are present in the Arabidopsis genome; only PPCk1 is expressed in rosette leaves. Homozygous lines of two independent PPCk1 T‐DNA‐insertional mutants showed very little (dln1), or no (csi8) light‐induced PEPC phosphorylation and a clear retard in growth under our greenhouse conditions. A mass‐spectrometry‐based analysis revealed significant changes in metabolite profiles. However, the anaplerotic pathway initiated by PEPC was only moderately altered. These data establish the PPCk1 gene product as responsible for leaf PEPC phosphorylation in planta and show that the absence of PEPC phosphorylation has pleiotropic consequences on plant metabolism.