Impaired photosystem I oxidation induces STN7-dependent phosphorylation of the light-harvesting complex I protein Lhca4 in Arabidopsis thaliana |
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Authors: | Anna Ihnatowicz Paolo Pesaresi Katharina Lohrig Dirk Wolters Bernd Müller Dario Leister |
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Affiliation: | Abteilung für Pflanzenzüchtung und Genetik, Max-Planck-Institut für Züchtungsforschung, Carl-von-Linné-Weg 10, 50829 cologne, Germany. |
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Abstract: | Reduction of the plastoquinone (PQ) pool is known to activate phosphorylation of thylakoid proteins. In the Arabidopsis thaliana mutants psad1-1 and psae1-3, oxidation of photosystem I (PSI) is impaired, and the PQ pool is correspondingly over-reduced. We show here that, under these conditions, the antenna protein Lhca4 of PSI becomes a target for phosphorylation. Phosphorylation of the mature Lhca4 protein at Thr16 is suppressed in stn7 psad1 and stn7 psae1 double mutants. Thus, under extreme redox conditions, hyperactivation of thylakoid protein kinases and/or reorganization of thylakoid protein complex distribution increase the susceptibility of PSI to phosphorylation. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. Anna Ihnatowicz and Paolo Pesaresi contributed equally to the article. |
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Keywords: | Lhca4 Protein kinase psae1 psad1 pThr Phosphothreonine STN7 Thylakoid phosphorylation |
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