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High Light Acclimation Induces Chloroplast Precursor Phosphorylation and Reduces Import Efficiency

Department Biologie I, Botanik, Ludwig-Maximilians-Universität, Großhaderner Strasse. 2-4, 82152 Planegg-Martinsried, Germany
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Plants 2020, 9(1), 24; https://doi.org/10.3390/plants9010024
Received: 29 November 2019 / Revised: 19 December 2019 / Accepted: 22 December 2019 / Published: 23 December 2019
Acclimation is an essential process in plants on many levels, but especially in chloroplasts under changing light conditions. It is partially known how the photosynthetic machinery reacts upon exposure to high light intensities, including rearrangement of numerous protein complexes. Since the majority of proteins residing within chloroplasts needs to be posttranslationally imported into the organelles, we endeavored to study how this important process is regulated upon subjecting plants from pea and Arabidopsis to high light. Our results reveal that acclimation takes place on the one hand in the cytosol by differential phosphorylation of preproteins and resulting from the altered expression of the responsible kinases, and on the other hand at the level of the translocation machineries in the outer (TOC) and inner (TIC) envelope membranes. Intriguingly, while phosphorylation is more pronounced under high light, import itself shows a lower efficiency, along with a reduced accumulation of the Toc receptor proteins Toc34 and Toc159.
Keywords: chloroplast; protein import; protein kinase; protein phosphorylation; Arabidopsis; acclimation chloroplast; protein import; protein kinase; protein phosphorylation; Arabidopsis; acclimation
MDPI and ACS Style

Eisa, A.; Malenica, K.; Schwenkert, S.; Bölter, B. High Light Acclimation Induces Chloroplast Precursor Phosphorylation and Reduces Import Efficiency. Plants 2020, 9, 24.

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