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Andrey Ivankin¹, Ivan Kuzmenko, David Gidalevitz

¹Center for Molecular Study of Condensed Soft Matter (muCoSM), and Division of Physics, BCPS Department, Illinois Institute of Technology, Chicago, Illinois 60616, USA.

Physical Review Letters

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Summary

Cholesterol and DPPC form mixed domains in monolayers, with cholesterol

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Area of Science:

Biophysics
Materials Science
Physical Chemistry

Background:

Cholesterol is a vital component of cell membranes.
Phospholipids form the basic structure of cell membranes.
Understanding cholesterol-phospholipid interactions is key to membrane function.

Purpose of the Study:

To investigate the structural organization of cholesterol-DPPC (1,2-dipalmitoyl-sn-glycero-3-phophocholine) mixed monolayers.
To determine the effect of cholesterol mole fraction on its vertical position relative to phospholipids.

Main Methods:

X-ray reflectivity
Grazing incidence x-ray diffraction

Main Results:

The vertical position of cholesterol depends on its mole fraction (chi(CHOL)).
Cholesterol and DPPC form alloylike mixed domains with short-range order.
The stoichiometry of mixed domains matches the overall film composition.

Conclusions:

A new model for cholesterol-phospholipid organization in mixed monolayers is proposed.
Cholesterol and DPPC exhibit specific organizational behaviors in monolayers.