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J. Cell Biol., Volume 146, Number 4, August 23, 1999 741-754
Copyright © 1999 by The Rockefeller University Press.

Electrospray Ionization Tandem Mass Spectrometry (ESI-MS/MS) Analysis of the Lipid Molecular Species Composition of Yeast Subcellular Membranes Reveals Acyl Chain-based Sorting/Remodeling of Distinct Molecular Species En Route to the Plasma Membrane

Roger Schneitera, Britta Brüggerb, Roger Sandhoffb, Günther Zellnigc, Andrea Lebera, Manfred Lampla, Karin Athenstaedta, Claudia Hrastnika, Sandra Edera, Günther Dauma, Fritz Paltaufa, Felix T. Wielandb, and Sepp D. Kohlweina
a Spezialforschungsbereich Biomembrane Research Center, Institut für Biochemie und Lebensmittelchemie, Technische Universität Graz, A-8010 Graz, Austria
b Biochemie-Zentrum Heidelberg, Universität Heidelberg, D-69120 Heidelberg, Germany
c Institut für Pflanzenphysiologie, Karl-Franzens Universität, A-8010 Graz, Austria

Correspondence to: Roger Schneiter, Institute of Biochemistry, Technical University Graz, Petersgasse 12, A-8010 Graz, Austria. Tel:43-316-873-6955 Fax:43-316-873-6952 E-mail:f548roge{at}mbox.tu-graz.ac.at.

Nano-electrospray ionization tandem mass spectrometry (nano-ESI-MS/MS) was employed to determine qualitative differences in the lipid molecular species composition of a comprehensive set of organellar membranes, isolated from a single culture of Saccharomyces cerevisiae cells. Remarkable differences in the acyl chain composition of biosynthetically related phospholipid classes were observed. Acyl chain saturation was lowest in phosphatidylcholine (15.4%) and phosphatidylethanolamine (PE; 16.2%), followed by phosphatidylserine (PS; 29.4%), and highest in phosphatidylinositol (53.1%). The lipid molecular species profiles of the various membranes were generally similar, with a deviation from a calculated average profile of ~± 20%. Nevertheless, clear distinctions between the molecular species profiles of different membranes were observed, suggesting that lipid sorting mechanisms are operating at the level of individual molecular species to maintain the specific lipid composition of a given membrane. Most notably, the plasma membrane is enriched in saturated species of PS and PE. The nature of the sorting mechanism that determines the lipid composition of the plasma membrane was investigated further. The accumulation of monounsaturated species of PS at the expense of diunsaturated species in the plasma membrane of wild-type cells was reversed in elo3{Delta} mutant cells, which synthesize C24 fatty acid-substituted sphingolipids instead of the normal C26 fatty acid-substituted species. This observation suggests that acyl chain-based sorting and/or remodeling mechanisms are operating to maintain the specific lipid molecular species composition of the yeast plasma membrane.

Key Words: Saccharomyces cerevisiae, subcellular fractions, lipids, cell membrane, mass fragmentography


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