A1 Refereed original research article in a scientific journal
Core protein phosphorylation facilitates the repair of photodamaged photosystem II at high light
Authors: Tikkanen M, Nurmi M, Kangasjarvi S, Aro EM
Publisher: ELSEVIER SCIENCE BV
Publication year: 2008
Journal: BBA - Bioenergetics
Journal name in source: BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
Journal acronym: BBA-BIOENERGETICS
Volume: 1777
Issue: 11
First page : 1432
Last page: 1437
Number of pages: 6
ISSN: 0005-2728
DOI: https://doi.org/10.1016/j.bbabio.2008.08.004(external)
Abstract
Phosphorylation of photosystem II (PSII) reaction center protein D1 has been hypothesised to function as a signal for the migration of photodamaged PSII core complex from grana membranes to stroma lamellae for concerted degradation and replacement of the photodamaged D1 protein. Here, by using the mutants with impaired capacity (stn8) or complete lack (stn7 stn8) in phosphorylation of PSII core proteins, the role of phosphorylation in PSII photodamage and repair was investigated. We show that the lack of PSII core protein phosphorylation disturbs the disassembly of PSII supercomplexes at high light, which is a prerequisite for efficient migration of damaged PSII complexes from grana to stroma lamellae for repair. This results in accumulation of photodamaged PSII complexes, which in turn results, upon prolonged exposure to high light (HL), in general oxidative damage of photosynthetic proteins in the thylakoid membrane. (C) 2008 Elsevier B.V. All rights reserved.
Phosphorylation of photosystem II (PSII) reaction center protein D1 has been hypothesised to function as a signal for the migration of photodamaged PSII core complex from grana membranes to stroma lamellae for concerted degradation and replacement of the photodamaged D1 protein. Here, by using the mutants with impaired capacity (stn8) or complete lack (stn7 stn8) in phosphorylation of PSII core proteins, the role of phosphorylation in PSII photodamage and repair was investigated. We show that the lack of PSII core protein phosphorylation disturbs the disassembly of PSII supercomplexes at high light, which is a prerequisite for efficient migration of damaged PSII complexes from grana to stroma lamellae for repair. This results in accumulation of photodamaged PSII complexes, which in turn results, upon prolonged exposure to high light (HL), in general oxidative damage of photosynthetic proteins in the thylakoid membrane. (C) 2008 Elsevier B.V. All rights reserved.
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