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Chloroplast acetyltransferase NSI is required for state transitions in Arabidopsis thaliana

The amount of light energy received by the photosynthetic reaction centers photosystem II (PSII) and photosystem I (PSI) is balanced through state transitions. Reversible phosphorylation of a light-harvesting antenna trimer (L-LHCII) orchestrates the association between L-LHCII and the photosystems,...

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Bibliographic Details
Main Authors: Konert, Minna (Author) , Trinh, Dinh-Van (Author) , Wirtz, Markus (Author)
Format: Article (Journal)
Language:English
Published: July 2, 2018
In: The plant cell
Year: 2018, Volume: 30, Issue: 8, Pages: 1695-1709
ISSN:1532-298X
DOI:10.1105/tpc.18.00155
Online Access:Resolving-System, Volltext: https://doi.org/10.1105/tpc.18.00155
Verlag: http://www.plantcell.org/content/30/8/1695
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Author Notes:Minna M. Koskela, Annika Brünje, Aiste Ivanauskaite, Magda Grabsztunowicz, Ines Lassowskat, Ulla Neumann, Trinh V. Dinh, Julia Sindlinger, Dirk Schwarzer, Markus Wirtz, Esa Tyystjärvi, Iris Finkemeier, and Paula Mulo
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Summary:The amount of light energy received by the photosynthetic reaction centers photosystem II (PSII) and photosystem I (PSI) is balanced through state transitions. Reversible phosphorylation of a light-harvesting antenna trimer (L-LHCII) orchestrates the association between L-LHCII and the photosystems, thus adjusting the amount of excitation energy received by the reaction centers. In this study, we identified the enzyme NUCLEAR SHUTTLE INTERACTING (NSI; AT1G32070) as an active lysine acetyltransferase in the chloroplasts of Arabidopsis thaliana. Intriguingly, nsi knockout mutant plants were defective in state transitions, even though they had a similar LHCII phosphorylation pattern as the wild type. Accordingly, nsi plants were not able to accumulate the PSI-LHCII state transition complex, even though the LHCII docking site of PSI and the overall amounts of photosynthetic protein complexes remained unchanged. Instead, the nsi mutants showed a decreased Lys acetylation status of specific photosynthetic proteins including PSI, PSII, and LHCII subunits. Our work demonstrates that the chloroplast acetyltransferase NSI is needed for the dynamic reorganization of thylakoid protein complexes during photosynthetic state transitions.
Item Description:Gesehen am 24.01.2020
Physical Description:Online Resource
ISSN:1532-298X
DOI:10.1105/tpc.18.00155

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