Photosystem II core phosphorylation and photosynthetic acclimation require two different protein kinases
Articolo
Data di Pubblicazione:
2005
Citazione:
Photosystem II core phosphorylation and photosynthetic acclimation require two different protein kinases / V. Bonardi, P. Pesaresi, T. Becker, E. Schleiff, R. Wagner, T. Pfannschmidt, P. Jahns, D. Leister. - In: NATURE. - ISSN 0028-0836. - 437:7062(2005 Oct 20), pp. 1179-1182.
Abstract:
Illumination changes elicit modifications of thylakoid proteins
and reorganization of the photosynthetic machinery. This involves, in the short term, phosphorylation of photosystem II
(PSII) and light-harvesting (LHCII) proteins. PSII phosphorylation
is thought to be relevant for PSII turnover1,2, whereas LHCII
phosphorylation is associated with the relocation of LHCII and
the redistribution of excitation energy (state transitions) between
photosystems3,4. In the long term, imbalances in energy distribution
between photosystems are counteracted by adjusting
photosystem stoichiometry5,6. In the green alga Chlamydomonas
and the plant Arabidopsis, state transitions require the orthologous
protein kinases STT7 and STN7, respectively7,8. Here we
show that in Arabidopsis a second protein kinase, STN8, is
required for the quantitative phosphorylation of PSII core proteins.
However, PSII activity under high-intensity light is affected
only slightly in stn8 mutants, and D1 turnover is indistinguishable
from the wild type, implying that reversible protein phosphorylation
is not essential for PSII repair. Acclimation to changes in
light quality is defective in stn7 but not in stn8 mutants, indicating
that short-term and long-term photosynthetic adaptations are
coupled. Therefore the phosphorylation of LHCII, or of an
unknown substrate of STN7, is also crucial for the control of
photosynthetic gene expression
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
V. Bonardi, P. Pesaresi, T. Becker, E. Schleiff, R. Wagner, T. Pfannschmidt, P. Jahns, D. Leister
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