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Research ArticleBIOCHEMICAL PROCESSES AND MACROMOLECULAR STRUCTURES
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The Cytosolic Kinases STY8, STY17, and STY46 Are Involved in Chloroplast Differentiation in Arabidopsis

Giorgia Lamberti, Irene L. Gügel, Jörg Meurer, Jürgen Soll, Serena Schwenkert
Giorgia Lamberti
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Irene L. Gügel
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Jörg Meurer
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Jürgen Soll
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Serena Schwenkert
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  • For correspondence: serena.schwenkert@lrz.uni-muenchen.de

Published September 2011. DOI: https://doi.org/10.1104/pp.111.182774

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  • © 2011 American Society of Plant Biologists. All rights reserved.

Abstract

In Arabidopsis (Arabidopsis thaliana), transit peptides for chloroplast-destined preproteins can be phosphorylated by the protein kinases STY8, STY17, and STY46. In this study, we have investigated the in vitro properties of these plant-specific kinases. Characterization of the mechanistic functioning of STY8 led to the identification of an essential threonine in the activation segment, which is phosphorylated by an intramolecular mechanism. STY8 is inhibited by specific tyrosine kinase inhibitors, although it lacked the ability to phosphorylate tyrosine residues in vitro. In vivo analysis of sty8, sty17, and sty46 Arabidopsis knockout/knockdown mutants revealed a distinct function of the three kinases in the greening process and in the efficient differentiation of chloroplasts. Mutant plants displayed not only a delayed accumulation of chlorophyll but also a reduction of nucleus-encoded chloroplast proteins and a retarded establishment of photosynthetic capacity during the first 6 h of deetiolation, supporting a role of cytosolic STY kinases in chloroplast differentiation.

  • Received July 1, 2011.
  • Accepted July 27, 2011.
  • Published July 28, 2011.
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The Cytosolic Kinases STY8, STY17, and STY46 Are Involved in Chloroplast Differentiation in Arabidopsis
Giorgia Lamberti, Irene L. Gügel, Jörg Meurer, Jürgen Soll, Serena Schwenkert
Plant Physiology Sep 2011, 157 (1) 70-85; DOI: 10.1104/pp.111.182774

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The Cytosolic Kinases STY8, STY17, and STY46 Are Involved in Chloroplast Differentiation in Arabidopsis
Giorgia Lamberti, Irene L. Gügel, Jörg Meurer, Jürgen Soll, Serena Schwenkert
Plant Physiology Sep 2011, 157 (1) 70-85; DOI: 10.1104/pp.111.182774
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Plant Physiology: 157 (1)
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