Theory of raft formation by the cross-linking of saturated or unsaturated lipids in model lipid bilayers

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Abstract

We consider the effect of cross-linking a small fraction of lipids, either saturated or unsaturated, in a mixture of saturated and unsaturated lipids and cholesterol. The change in phase behavior is examined utilizing a recent phenomenological model of the ternary system, which is extended to include a fourth component representing the cross-linked lipids. These lipids are taken to be identical to monomeric ones except for their reduced entropy of mixing. We find that even a relatively small amount of cross-linked lipids, less than 5 mol %, is sufficient to significantly expand the range of compositions within which there is coexistence between liquid-ordered and liquid-disordered phases. Equivalently, the cross-linking of lipids increases the liquidliquid miscibility transition temperature, and therefore could bring about phase separation at a temperature at which, before cross-linking, there was only a single liquid phase. © 2009 by the Biophysical Society.

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Putzel, G. G., & Schick, M. (2009). Theory of raft formation by the cross-linking of saturated or unsaturated lipids in model lipid bilayers. Biophysical Journal, 96(12), 4935–4940. https://doi.org/10.1016/j.bpj.2009.04.019

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