title: Adjusting membrane lipids under salt stress: the case of the moderate halophilic organism Halobacillus halophilus.
abstract: The lipid composition of Halobacillus halophilus was investigated by combined thin-layer chromatography and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analyses of the total lipid extract. Main polar lipids were found to be sulfoquinovosyldiacylglycerol and phosphatidylglycerol, while cardiolipin was a minor lipid together with phosphatidic acid, alanyl-phosphatidylglycerol and two not yet fully identified lipid components. In addition the analyses of residual lipids, associated with denatured proteins after the lipid extraction, revealed the presence of significant amounts of cardiolipin, indicating that it is a not readily extractable phospholipid. Post decay source mass spectrometry analyses allowed the determination of acyl chains of main lipid components. On increasing the culture medium salinity, an increase in the shorter chains and the presence of chain unsaturations were observed. These changes in the lipid core structures might compensate for the increase in packing and rigidity of phospholipid and sulfoglycolipid polar heads in high-salt medium, therefore contributing to the homeostasis of membrane fluidity and permeability in salt stress conditions.
authors.affiliation: Institute for Microelectronics and Microsystems, National Research Council (IMM-CNR), Lecce, Italy.
authors.forename: Patrizia
authors.initials: P
authors.lastname: Lopalco
authors.forename: Roberto
authors.initials: R
authors.lastname: Angelini
authors.forename: Simona
authors.initials: S
authors.lastname: Lobasso
authors.forename: Saskia
authors.initials: S
authors.lastname: Köcher
authors.forename: Melanie
authors.initials: M
authors.lastname: Thompson
authors.forename: Volker
authors.initials: V
authors.lastname: Müller
authors.forename: Angela
authors.initials: A
authors.lastname: Corcelli
mesh_terms: D002308:Cardiolipins / Q000378:metabolism; D002855:Chromatography, Thin Layer / Q000379:methods; D006017:Glycolipids / Q000378:metabolism; D058678:Halobacillus / Q000378:metabolism*; D008563:Membrane Lipids / Q000378:metabolism*; D010715:Phosphatidylglycerols / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism; D054712:Salinity; D012965:Sodium Chloride; D013312:Stress, Physiological / Q000502:physiology*
chemical_list: D002308:Cardiolipins; D006017:Glycolipids; D008563:Membrane Lipids; D010715:Phosphatidylglycerols; D010743:Phospholipids; C011117:sulfoglycolipids; D012965:Sodium Chloride