Abstract
The surface behavior of six different ether lipids from archaebacteria, based on condensation of glycerol or more complex polyols with two isoprenoid alcohols at 20 or 40 carbon atoms, was investigated in monolayers at the air-water interface.
The compounds with no complex polar group (GD, GDGT, GDNT) form monolayers showing a reversible collapse at surface pressure as low as 22 dynes/cm. This collapse pressure decrease with temperature in such a way that the film tension remains constant. In condensed films, these molecules do not assume a completely upright position.
Lipids with complex polar ends (HL, GLB, PLII) form films more stable to compression. Forcearea characteristics and surface moment values of HL monolayers are similar to those of analogous ester lipids with fatty acid chains. Monolayers of the two bipolar lipids, GLB and PLII, at room temperature present a more condensed state, probably due to the lateral cohesion between long alkyl chains, but a lower collapse pressure.
For all bipolar lipids, the area expansion induced by temperature increase is larger than that of monopolar ones.
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Abbreviations
- GD:
-
Glycerol diether (2,3-di-O-phytanyl-sn-glycerol
- GDGT:
-
Glycerol-dialkyl-glycerol tetraether
- GDNT:
-
Glycerol-dialkyl-nonitol tetraether
- GLB:
-
Glycolipid B
- PLII:
-
Phospholipid II
- HL:
-
Total lipid extract from Halobacterium halobium
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Rolandi, R., Schindler, H., De Rosa, M. et al. Monolayers of ether lipids from archaebacteria. Eur Biophys J 14, 19–27 (1986). https://doi.org/10.1007/BF00260399
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DOI: https://doi.org/10.1007/BF00260399