Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          Institute: MPI für molekulare Pflanzenphysiologie     Collection: Publikationen Pflanzenphysiologie     Display Documents

ID: 305771.0, MPI für molekulare Pflanzenphysiologie / Publikationen Pflanzenphysiologie
Functional differences between galactolipids and glucolipids revealed in photosynthesis of higher plants
Authors:Hoelzl, G.; Witt, S.; Kelly, A. A.; Zahringer, U.; Warnecke, D.; Doermann, P.; Heinz, E.
Date of Publication (YYYY-MM-DD):2006-05-09
Title of Journal:Proceedings of the National Academy of Sciences of the United States of America
Journal Abbrev.:P Natl Acad Sci USA
Issue / Number:19
Start Page:7512
End Page:7517
Review Status:not specified
Audience:Not Specified
Abstract / Description: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 presence of galactose is crucial to maintain maximal photosynthetic efficiency.
Free Keywords:chloroplast
; galactose
; glucose
; lipid
; glucosylgalactosyldiacylglycerol
; light-harvesting complex
; arabidopsis-thaliana
; monogalactosyldiacylglycerol synthase
; chloroplast envelopes
; angstrom resolution
; photosystem-i
; dgd1 mutant
; lipids
; digalactosyldiacylglycerol
; glycosyltransferases
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für molekulare Pflanzenphysiologie/Molecular Physiology/AG Doermann
External Affiliations:Biocenter Klein Flottbek and Botanical Garden, University of Hamburg, Ohnhorststrasse 18, 22609 Hamburg, Germany
Research Center Borstel, Center for Medical and Life Sciences, 23845 Borstel, Germany Ctr Med & Life Sci, Res Ctr Borstel, D-23845 Borstel, Germany
Identifiers:ISI:000237589000057 [ID No:1]
ISI:000237589000057 [ID No:2]
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.