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Title

Sharing light between two photosystems: mechanism of state transitions

Authors
Bassi, Roberto
Published in Current Opinion in Plant Biology. 2015, vol. 25, p. 71-78
Abstract In the thylakoid membrane, the two photosystems act in series to promote linear electron flow, with the concomitant production of ATP and reducing equivalents such as NADPH. Photosystem I, which is preferentially activated in far-red light, also energizes cyclic electron flow which generates only ATP. Thus, changes in light quality and cellular metabolic demand require a rapid regulation of the activity of the two photosystems. At low light intensities, this is mediated by state transitions. They allow the dynamic allocation of light harvesting antennae to the two photosystems, regulated through protein phosphorylation by a kinase and phosphatase pair that respond to the redox state of the electron transfer chain. Phosphorylation of the antennae leads to remodeling of the photosynthetic complexes.
Keywords Chlamydomonas/metabolism/radiation effectsLightOxidation-ReductionPhosphorylationPhotosystem I Protein Complex/radiation effectsPhotosystem II Protein Complex/radiation effectsPlants/metabolism/radiation effectsThylakoids/metabolism/radiation effects
Identifiers
PMID: 26002067
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Structures
Research group Groupe Goldschmidt-Clermont
Projects FNS: 31003A_146300 and 3100A0-117712
FP7: CALIPSO
FP7: ACCLIPHOT
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GOLDSCHMIDT-CLERMONT, Michel P., BASSI, Roberto. Sharing light between two photosystems: mechanism of state transitions. In: Current Opinion in Plant Biology, 2015, vol. 25, p. 71-78. https://archive-ouverte.unige.ch/unige:86426

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Deposited on : 2016-08-29

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