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Science 299 (5612): 1572-1575

Copyright © 2003 by the American Association for the Advancement of Science

Role of Chloroplast Protein Kinase Stt7 in LHCII Phosphorylation and State Transition in Chlamydomonas

Nathalie Depège, Stéphane Bellafiore, Jean-David Rochaix*

Photosynthetic organisms adapt to changes in light quality by redistributing light excitation energy between two photosystems through state transition. This reorganization of antenna systems leads to an enhanced photosynthetic yield. Using a genetic approach in Chlamydomonas reinhardtii to dissect the signal transduction pathway of state transition, we identified a chloroplast thylakoid-associated serine-threonine protein kinase, Stt7, that has homologs in land plants. Stt7 is required for the phosphorylation of the major light-harvesting protein (LHCII) and for state transition.

Department of Molecular Biology and Department of Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva 4, Switzerland.
*   To whom correspondence should be addressed. E-mail: jean-david.rochaix{at}

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PLANT CELL 17, 2768-2781
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PLANT CELL 17, 648-663
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Plant Physiology 137, 545-556
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The central role of the green alga Chlamydomonas reinhardtii in revealing the mechanism of state transitions.
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Dithiol Oxidant and Disulfide Reductant Dynamically Regulate the Phosphorylation of Light-Harvesting Complex II Proteins in Thylakoid Membranes.
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Mol. Cell. Proteomics 2, 550-559
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BOTANY: State Transitions--a Question of Balance.
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