J. Lipid Res.
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A more recent version of this article appeared on November 1, 2003

Papers In Press, published online ahead of print August 16, 2003
J. Lipid Res., doi:10.1194/jlr.M300212-JLR200
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Submitted on May 22, 2003
Revised on July 3, 2003
Accepted on August 4, 2003

Osmotic shock induces the presence of glycocardiolipin in the purple membrane of Halobacterium salinarum

Simona Lobasso, Patrizia Lopalco, Veronica M.T. Lattanzio, and Angela Corcelli

Dipartimento di Fisiologia Generale ed Ambientale, Università di Bari, Bari 70126

Corresponding Author: a.corcelli{at}biologia.uniba.it

In the purple membrane (PM) of Halobacterium salinarum is present a phospholipid dimer consisting of a sulfotriglycosyldiether (S-TGD-1) esterified to the phosphate group of phosphatidic acid (PA), i.e. S-TGD-1-PA, called glycocardiolipin (GlyC)(Corcelli, A., Colella, M., Mascolo, G., Fanizzi, F.P., and Kates, M. (2000) Biochemistry 39, 3318-3326). The GlyC content of whole cells, PM and other cell fractions of Halobacterium salinarum has been analysed. GlyC is a non abundant phospholipid in Hbt. salinarum cells, while it represents one of the major phospholipids of isolated PM. In this report we show that a) GlyC is formed during the isolation of PM; b) GlyC increase in Hbt. salinarum cells is specifically induced by osmotic shock; c) in correspondence of Gly increase, a decrease of S-TGD-1 levels occurs. The changes in membrane lipid composition observed during the isolation of PM are due to de novo synthesis of GlyC from S-TGD-1.


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