Impaired Photosystem I oxidation induces STN7-dependent phosphorylation of the light-harvesting complex I protein Lhca4 in Arabidopsis thaliana
Articolo
Data di Pubblicazione:
2008
Citazione:
Impaired Photosystem I oxidation induces STN7-dependent phosphorylation of the light-harvesting complex I protein Lhca4 in Arabidopsis thaliana / A. Inhatowicz, P. Pesaresi, D. Wolters, B. Müller, D. Leister. - In: PLANTA. - ISSN 0032-0935. - 227:3(2008), pp. 717-722.
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Lhca4 ; protein kinase ; psae1 ; psad1 ; pThr ; phosphothreonine ; STN7 ; thylakoid phosphorylation
Elenco autori:
A. Inhatowicz, P. Pesaresi, D. Wolters, B. Müller, D. Leister
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