Cell membrane hybrid bilayers containing the G-protein-coupled receptor CCR5.

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TitleCell membrane hybrid bilayers containing the G-protein-coupled receptor CCR5.
Publication TypeJournal Article
Year of Publication2002
AuthorsN Rao, M, Silin, VI, Ridge, KD, Woodward, JT, Plant, AL
JournalAnal Biochem
Volume307
Issue1
Pagination117-30
Date Published2002 Aug 1
ISSN0003-2697
KeywordsAnimals, Cattle, Cell Membrane, Cercopithecus aethiops, Chemokine CCL5, Chimera, COS Cells, Humans, Immunoglobulin G, Ligands, Lipid Bilayers, Liposomes, Membrane Lipids, Microscopy, Atomic Force, Protein Binding, Receptors, CCR5, Rhodopsin, Sulfhydryl Compounds, Surface Plasmon Resonance
Abstract

A hybrid bilayer membrane is a planar model membrane that is formed at an alkanethiol monolayer-coated gold surface by the spontaneous reorganization of phospholipid vesicles. Membrane vesicles from monkey kidney COS-1 cells also reorganize at an alkanethiol/lipid monolayer-coated surface resulting in the formation of a cell membrane hybrid bilayer. Atomic force microscopy and spectroscopic ellipsometry indicate that the cell membrane layer is equivalent to the thickness of one leaflet of the membrane and is continuous over large areas. Cell membrane hybrid bilayers were formed from membrane vesicles from COS-1 cells that were transiently transfected with a synthetic human CCR5 chemokine receptor gene. Preparations that contained "inside out" and "right side out" membrane vesicles were used. Binding of monoclonal antibodies to either the amino- or carboxyl-terminus of CCR5 was observed by surface plasmon resonance and confirmed the presence and the random orientation of these integral membrane receptors. Specific and concentration-dependent binding of the beta-chemokine RANTES to the cell membrane hybrid confirmed that CCR5 retained ligand-binding activity. The ability to form cell membrane hybrid bilayers that contain functional G-protein-coupled or other multispanning receptors without requiring protein isolation, purification, and reconstitution offers a promising method for the rapid screening of potential ligands.

Alternate JournalAnal. Biochem.
PubMed ID12137788