Volume 20, Issue 6 pp. 531-537
Research Article

Temperature-dependent localization of GPI-anchored intestinal alkaline phosphatase in model rafts

Marie-Cécile Giocondi

Marie-Cécile Giocondi

Institut National de la Santé et de la Recherche Médicale, Unité 554, Montpellier, France

Université de Montpellier, Centre National de la Recherche Scientifique, UMR 5048, Centre de Biochimie Structurale, Montpellier, France

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Françoise Besson

Françoise Besson

ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, 43 boulevard du 11 novembre 1918, Villeurbanne, F-69622, France

CNRS, UMR 5246, Villeurbanne, F-69622, France

Université de Lyon, Lyon, F-69003, France

Université Lyon 1, F-69003, France

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Patrice Dosset

Patrice Dosset

Institut National de la Santé et de la Recherche Médicale, Unité 554, Montpellier, France

Université de Montpellier, Centre National de la Recherche Scientifique, UMR 5048, Centre de Biochimie Structurale, Montpellier, France

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Pierre-Emmanuel Milhiet

Pierre-Emmanuel Milhiet

Institut National de la Santé et de la Recherche Médicale, Unité 554, Montpellier, France

Université de Montpellier, Centre National de la Recherche Scientifique, UMR 5048, Centre de Biochimie Structurale, Montpellier, France

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Christian Le Grimellec

Corresponding Author

Christian Le Grimellec

Institut National de la Santé et de la Recherche Médicale, Unité 554, Montpellier, France

Université de Montpellier, Centre National de la Recherche Scientifique, UMR 5048, Centre de Biochimie Structurale, Montpellier, France

Nanostructures and Membrane Complexes, C.B.S., 29 rue de Navacelles, 34090 Montpellier Cedex, France.Search for more papers by this author
First published: 17 August 2007
Citations: 17

Paper presented as part of a special issue of papers from the AFMBiomed conference, Barcelona 2007.

Abstract

In plasma membranes, most of glycosylphosphatidylinositol (GPI)-anchored proteins would be associated with rafts, a category of ordered microdomains enriched in sphingolipids and cholesterol (Ch). They would be also concentrated in the detergent resistant membranes (DRMs), a plasma membrane fraction extracted at low temperature. Preferential localization of GPI-anchored proteins in these membrane domains is essentially governed by their high lipid order, as compared to their environment. Changes in the temperature are expected to modify the membrane lipid order, suggesting that they could affect the distribution of GPI-anchored proteins between membrane domains. Validity of this hypothesis was examined by investigating the temperature-dependent localization of the GPI-anchored bovine intestinal alkaline phophatase (BIAP) into model raft made of palmitoyloleoylphosphatidylcholine/sphingomyelin/cholesterol (POPC/SM/Chl) supported membranes. Atomic force microscopy (AFM) shows that the inserted BIAP is localized in the SM/Chl enriched ordered domains at low temperature. Above 30°C, BIAP redistributes and is present in both the ‘fluid’ POPC enriched and the ordered SM/Chl domains. These data strongly suggest that in cells the composition of plasma membrane domains at low temperature differs from that at physiological temperature. Copyright © 2007 John Wiley & Sons, Ltd.

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