期刊
BIOPHYSICAL JOURNAL
卷 101, 期 1, 页码 118-127出版社
CELL PRESS
DOI: 10.1016/j.bpj.2011.05.036
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资金
- UChicago MRSEC of the NSF [DMR-0820054]
- US-Israel Binational Foundation [2006076]
- UChicago MSTP (NIGMS/MSNRSA) [5T32GM07281]
- March of Dimes [6-FY07-357]
- NSF [MCB-0920316]
- NIH [T90 DK070076]
- James Franck Institute
- National Science Foundation/Department of Energy [CHE0087817]
- U.S. Department of Energy, Basic Energy Sciences, Office of Science [W-31-109-Eng-38]
- DOE Office of Basic Energy Sciences and Los Alamos National Laboratory [DE-AC52-06NA25396]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0822838] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [2006076] Funding Source: National Science Foundation
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [0920316] Funding Source: National Science Foundation
Lipid interfaces, ranging from cell membranes to thin surfactant layers that stabilize lung alveoli, are integral to living systems. Such interfaces are often subjected to mechanical forces, and because of their membrane-like geometry, they can easily deform by bending into localized folds. In this work, we explore the role of small molecules (i.e., glycerol) on the mechanical stability of model lung surfactant monolayers. We demonstrate that the presence of glycerol increases local monolayer bending stiffness by orders of magnitude. Our x-ray and neutron reflectivity measurements indicate that water is preferentially depleted, or glycerol is preferentially enriched, at the lipid headgroup/solvent interface, and that this glycerol-enriched layer extends O(10 angstrom) beneath the monolayer with an adsorption free energy of -2.5 to -4.6 kJ/mol. The dramatic change in membrane bending stiffness in the presence of the sugar adlayer is understood in terms of two models: 1), lipid antiplasticization by glycerol; and 2), a continuum mechanical model of the viscous adlayer.
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