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Lipid rafts: at a crossroad between cell biology and physics

Abstract

Membrane lateral heterogeneity is accepted as a requirement for the function of biological membranes and the notion of lipid rafts gives specificity to this broad concept. However, the lipid raft field is now at a technical impasse because the physical tools to study biological membranes as a liquid that is ordered in space and time are still being developed. This has lead to a disconnection between the concept of lipid rafts as derived from biochemical and biophysical assays and their existence in the cell. Here, we compare the concept of lipid rafts as it has emerged from the study of synthetic membranes with the reality of lateral heterogeneity in biological membranes. Further application of existing tools and the development of new tools are needed to understand the dynamic heterogeneity of biological membranes.

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Figure 1: Domain-length scales and the biomembrane as a protein–lipid composite material.
Figure 2: Examples of lipid and protein domains in cell membranes.

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Acknowledgements

K.J. thanks A G. Lee, G. Schutz and H. Stockinger for stimulating comments. We also thank A. Diehl and B. Yang for artwork and assistance in preparing the manuscript. This work was supported by the National Institutes of Health (NIH) grant GM 41402 (K.J.), the Kenan Distinguished Professorship (K.J.), NIH grant HL 20948 (R.A.), NIH grant GM 52016 (R.A.), the Perot Family Foundation (R.A.) and the Cecil H. Green Distinguished Chair in Cellular and Molecular Biology (R.A.). MEMPHYS-Center for Biomembrane Physics is supported by the Danish National Research Foundation (O.G.M.).

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Jacobson, K., Mouritsen, O. & Anderson, R. Lipid rafts: at a crossroad between cell biology and physics. Nat Cell Biol 9, 7–14 (2007). https://doi.org/10.1038/ncb0107-7

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