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Photosynthetic organisms adapt to changes in light quality by
redistributing light excitation energy between two photosystemsthrough
state transition. This reorganization of antenna systemsleads to an
enhanced photosynthetic yield. Using a genetic approachin
Chlamydomonas reinhardtii to dissect the signal transductionpathway of state transition, we identified a chloroplast
thylakoid-associatedserine-threonine protein kinase, Stt7,
that has homologs in landplants. Stt7 is required for the
phosphorylation of the majorlight-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}molbio.unige.ch
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