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Universal behavior of membranes with sterols |
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| Authors: | Henriksen J Rowat A C Brief E Hsueh Y W Thewalt J L Zuckermann M J Ipsen J H |
| Institution: | * MEMPHYS - Centre for Biomembrane Physics, Department of Physics, Syddansk Universitet, Odense, Denmark † Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada ‡ Department of Physics, National Central University, Chungli, Taiwan § Department of Biochemistry and Molecular Biology, Simon Fraser University, Burnaby, British Columbia, Canada |
| Abstract: | Lanosterol is the biosynthetic precursor of cholesterol and ergosterol, sterols that predominate in the membranes of mammals and lower eukaryotes, respectively. These three sterols are structurally quite similar, yet their relative effects on membranes have been shown to differ. Here we study the effects of cholesterol, lanosterol, and ergosterol on 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine lipid bilayers at room temperature. Micropipette aspiration is used to determine membrane material properties (area compressibility modulus), and information about lipid chain order (first moments) is obtained from deuterium nuclear magnetic resonance. We compare these results, along with data for membrane-bending rigidity, to explore the relationship between membrane hydrophobic thickness and elastic properties. Together, such diverse approaches demonstrate that membrane properties are affected to different degrees by these structurally distinct sterols, yet nonetheless exhibit universal behavior. |
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