Functional differences between galactolipids and glucolipids revealed in photosynthesis of higher plants.

Proceedings of the National Academy of Sciences of the United States of America
Georg HölzlErnst Heinz

Abstract

Galactolipids represent the most abundant lipid class in thylakoid membranes, where oxygenic photosynthesis is performed. The identification of galactolipids at specific sites within photosynthetic complexes by x-ray crystallography implies specific roles for galactolipids during photosynthetic electron transport. The preference for galactose and not for the more abundant sugar glucose in thylakoid lipids and their specific roles in photosynthesis are not understood. Introduction of a bacterial glucosyltransferase from Chloroflexus aurantiacus into the galactolipid-deficient dgd1 mutant of Arabidopsis thaliana resulted in the accumulation of a glucose-containing lipid in the thylakoids. At the same time, the growth defect of the dgd1 mutant was complemented. However, the degree of trimerization of light-harvesting complex II and the photosynthetic quantum yield of transformed dgd1 plants were only partially restored. These results indicate that specific interactions of the galactolipid head group with photosynthetic protein complexes might explain the preference for galactose in thylakoid lipids of higher plants. Therefore, galactose in thylakoid lipids can be exchanged with glucose without severe effects on growth, but the pre...Continue Reading

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Citations

Nov 5, 2008·The Journal of Biological Chemistry·Malin WikströmAke Wieslander
Oct 18, 2007·Proceedings of the National Academy of Sciences of the United States of America·Koichi KobayashiHiroyuki Ohta
Dec 15, 2010·Trends in Plant Science·Eric R Moellering, Christoph Benning
Jun 30, 2007·Progress in Lipid Research·Georg Hölzl, Peter Dörmann
May 17, 2011·Biochimica Et Biophysica Acta·Naoki Mizusawa, Hajime Wada
Oct 24, 2012·Phytochemistry·Atsushi ArakakiTadashi Matsunaga
Sep 8, 2016·Proceedings of the National Academy of Sciences of the United States of America·Amélie A KellyPeter Dörmann
Jan 19, 2018·Genes & Genetic Systems·Egi Tritya Apdila, Koichiro Awai
Apr 17, 2020·Metabolites·Anastasiya KuhalskayaSaleh Alseekh
Feb 21, 2019·Annual Review of Plant Biology·Georg Hölzl, Peter Dörmann
Nov 27, 2009·European Journal of Cell Biology·Dirk Warnecke, Ernst Heinz

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