title: DGDG and Glycolipids in Plants and Algae.
abstract: Photosynthetic organelles in plants and algae are characterized by the high abundance of glycolipids, including the galactolipids mono- and digalactosyldiacylglycerol (MGDG, DGDG) and the sulfolipid sulfoquinovosyldiacylglycerol (SQDG). Glycolipids are crucial to maintain an optimal efficiency of photosynthesis. During phosphate limitation, the amounts of DGDG and SQDG increase in the plastids of plants, and DGDG is exported to extraplastidial membranes to replace phospholipids. Algae often use betaine lipids as surrogate for phospholipids. Glucuronosyldiacylglycerol (GlcADG) is a further glycolipid that accumulates under phosphate deprived conditions. In contrast to plants, a number of eukaryotic algae contain very long chain polyunsaturated fatty acids of 20 or more carbon atoms in their glycolipids. The pathways and genes for galactolipid and sulfolipid synthesis are largely conserved between plants, Chlorophyta, Rhodophyta and algae with complex plastids derived from secondary or tertiary endosymbiosis. However, the relative contribution of the endoplasmic reticulum- and plastid-derived lipid pathways for glycolipid synthesis varies between plants and algae. The genes for glycolipid synthesis encode precursor proteins imported into the photosynthetic organelles. While most eukaryotic algae contain the plant-like galactolipid (MGD1, DGD1) and sulfolipid (SQD1, SQD2) synthases, the red alga Cyanidioschyzon harbors a cyanobacterium-type DGDG synthase (DgdA), and the amoeba Paulinella, derived from a more recent endosymbiosis event, contains cyanobacterium-type enzymes for MGDG and DGDG synthesis (MgdA, MgdE, DgdA).
authors.affiliation: Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Karlrobert-Kreiten-Straße 13, 53115, Bonn, Germany.
authors.forename: Barbara
authors.initials: B
authors.lastname: Kalisch
authors.affiliation: Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Karlrobert-Kreiten-Straße 13, 53115, Bonn, Germany. doermann@uni-bonn.de.
authors.forename: Peter
authors.initials: P
authors.lastname: Dörmann
authors.affiliation: Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Karlrobert-Kreiten-Straße 13, 53115, Bonn, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Hölzl
mesh_terms: D038983:Galactolipids / Q000737:chemistry / Q000378:metabolism*; D006017:Glycolipids / Q000737:chemistry / Q000378:metabolism*; D058086:Microalgae / Q000378:metabolism*; D015394:Molecular Structure; D010944:Plants / Q000378:metabolism*
chemical_list: D038983:Galactolipids; D006017:Glycolipids; C007388:digalactosyldiacylglycerol
keywords: Chlorophyta; Chloroplast; Endosymbiosis; Eukaryotic; Galactolipid; Phosphate deprivation; Prokaryotic; Rhodophyta