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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Thomas, Douglas D. / Turk, Boris / Wittinghofer, Alfred

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IMPACT FACTOR 2016: 3.273

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1437-4315
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Volume 386, Issue 8

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Differential accumulation of plastid preprotein translocon components during spruce (Picea abies L. Karst.) needle development

Hrvoje Fulgosi
  • Department of Molecular Biology, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
  • Other articles by this author:
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/ Hrvoje Lepeduš
  • Department of Biology, Faculty of Philosophy, University of J.J. Strossmayer, L. Jägera 9, HR-31000 Osijek, Croatia
  • Other articles by this author:
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/ Vera Cesar
  • Department of Biology, Faculty of Philosophy, University of J.J. Strossmayer, L. Jägera 9, HR-31000 Osijek, Croatia
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/ Nikola Ljubešić
  • Department of Molecular Biology, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
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Published Online: 2005-09-06 | DOI: https://doi.org/10.1515/BC.2005.091

Abstract

We demonstrate that basic components of the plastid protein-import apparatus originally found in pea, Toc34, Toc159, and Tic110, are also conserved in evolutionarily younger gymnosperms. We show that multiple isoforms of the preprotein receptor Toc34 differentially accumulate in various stages of needle development, while the amounts of Toc159 drastically decrease during chloroplast morphogenesis. Spruce Toc34 and Toc159 receptors are able to recognise and interact with the angiosperm precursor of the Rubisco small subunit. Young proplastids found in closed buds contain a highly elevated number of protein translocation complexes equipped with only two types of outer envelope receptors, Toc159 and a 30-kDa Toc34-related protein. Photosystem II (PSII) can already be assembled in a fully functional complex at this very early stage of needle development, suggesting that no additional receptor isoforms are needed for translocation of all necessary PSII components. We conclude that the accumulation of evolutionarily conserved plastid preprotein translocation components is differentially regulated during spruce needle development.

Keywords: plastid biogenesis; proplastids; protein translocation; Tic; Toc

About the article

Corresponding author


Received: March 29, 2005

Accepted: June 6, 2005

Published Online: 2005-09-06

Published in Print: 2005-08-01


Citation Information: Biological Chemistry, Volume 386, Issue 8, Pages 777–783, ISSN (Online) 1437-4315, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2005.091.

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