Abstract
Given the proposed importance of membrane tension in regulating cellular functions, we explore the effects of a finite surface tension on phase equilibrium using a molecular theory that captures the quantitative structure of the phase diagram of the tensionless DPPC/DOPC/Cholesterol lipid bilayer. We find that an increase in the surface tension decreases the temperature of the transition from liquid to gel in a pure DPPC system by ∼1.0 K/(mN/m), and decreases the liquid-disordered to liquid-ordered transition at constant chemical potentials by approximately the same amount. Our results quantitatively isolate the role of tension in comparison to other thermodynamic factors, such as pressure, in determining the phase behavior of lipid bilayers.
Original language | English (US) |
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Pages (from-to) | 517-522 |
Number of pages | 6 |
Journal | Biophysical Journal |
Volume | 102 |
Issue number | 3 |
DOIs | |
State | Published - Feb 8 2012 |
Funding
This work is supported by the National Science Foundation under CBET-0828046 (to I.S.) and DMR-0803956 (to M.S.). This work is also supported by the National Institutes of Health grant No. NIH GM087016 (to I.S.).
ASJC Scopus subject areas
- Biophysics