Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
Volume 1818, Issue 5, Pages 1365-1373Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbamem.2012.02.014
Keywords
Archaea; Cardiolipin; Ether lipids; Isopranoid chains; MALDI-TOF/MS; Natronococcus
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Funding
- Laboratory Sens&Micro LAB Project (POFESR) of Apulia Region [15]
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The lipidome of two extremely haloalkaliphilic archaea, Natronococcus occultus and Natronococcus amylolyticus, has been examined by means of combined thin-layer chromatography and MALDI-TOF/MS analyses. The detailed investigation of lipid profiles has confirmed the presence of i) ether lipid phosphatidylglycerol and phosphatidylglycerophosphate methyl ester as main lipid components, ii) both C-20 and C-25 isopranoid chains in the lipid core and yielded new findings on membrane lipids of these unusual organisms. Besides some novel minor or trace phospholipids and glycolipids, data indicate the presence of ether lipid cardiolipin variants constituted by different combinations of C-20 and C-25 isopranoid chains, never before described in archaea. The role of C-25 isopranoid chains in the adaptation to high pH gradients in the presence of very high salt concentrations is discussed. (C) 2012 Elsevier B.V. All rights reserved.
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