Journal of Bioenergetics and Biomembranes

, Volume 19, Issue 6, pp 691–703

Structural and functional consequences of galactolipids on thylakoid membrane organization

  • Sallie G. Sprague
Mini-Review

DOI: 10.1007/BF00762303

Cite this article as:
Sprague, S.G. J Bioenerg Biomembr (1987) 19: 691. doi:10.1007/BF00762303

Abstract

Photosynthetic membranes of higher plant chloroplasts are composed primarily of polar, but uncharged, galactolipids unlike most mammalian membranes which contain large amounts of phosphatidylcholine. It is unclear what role(s) the galactolipids play in maintaining the differentiated thylakoid membranes, or in stabilizing the photosynthetically active enzyme complexes. Some of the membrane complexes show no lipid selectivity for maintaining structural or functional integrity. Others are poisoned or dissociated in the presence of high concentrations of a trace lipid class. The efficiency of energy transfer and the reconstitution of protein complexes into liposomes are dependent on the lipid class employed. The lipids are asymmetrically arranged along and across the thylakoid membranes but not as distinctly as the proteins.

Key words

Galactolipids photosynthesis chloroplast membranes structure function reconstitution fusion liposomes lipases 

Abbreviations

DGDG

digalactosyldiglyceride

MGDG

monogalactosyldiglyceride

SQDG

sulfoquinovosyldiglyceride

PG

phosphatidylglycerol

PC

phosphatidylcholine

PE

phosphatidylethanolamine

PSI

photosystem I

PSII

photosystem II

LHC

chlorophylla/b lightharvesting complex

cytb6f

cytochromeb6f complex

CF0/CF1

coupling factor ATPase

DCIP

2,6-dichlorophenolindophenol

LRa

galactolipase fromRhizopus arrhis

Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • Sallie G. Sprague
    • 1
  1. 1.Department of BiochemistryWest Virginia University, School of MedicineMorgantown

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