Characterization of membrane protein reconstitution in LUVs of different lipid composition by fluorescence anisotropy
authors Neves, P; Lopes, SCDN; Sousa, I; Garcia, S; Eaton, P; Gameiro, P
journal JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
author keywords Proteoliposomes; Reconstitution; Steady-state fluorescence anisotropy; AFM
keywords PHOSPHOLIPID VESICLE FORMATION; ESCHERICHIA-COLI; BICINCHONINIC ACID; OCTYL GLUCOSIDE; TRITON X-100; DETERGENTS; LIPOSOMES; PEPTIDE; CHANNEL; CRYSTALLIZATION
abstract A major requirement to perform structural studies with membrane proteins is not only to define efficient reconstitution protocols, that assure a high incorporation degree in preformed liposomes, but also a protein directionality and topology that mimics its in vivo conditions. For this kind of studies, protein reconstitution in membranes systems via a detergent-mediated pathway is usually successfully adopted, since detergents are generally used in the initial isolation and purification of membrane proteins. In this study we report the reconstitution of OmpF in preformed DMPC and E. coli liposomes using two different techniques for detergent removal: (1) exclusion chromatography and (2) incubation with detergent-adsorbing beads. The incorporation degree was determined by bicinchoninic acid assay and fluorescence anisotropy was used to determine OmpF effect on the structural order of membrane lipids. These results show that protein insertion in membranes depends both on the technique used to remove detergent and on the lipids used to prepare the liposomes. Furthermore, it is possible to state that although the insertion is directly related to the size distributions of proteoliposomes, it could be efficiently recognized by steady-state fluorescence anisotropy. This technique, more Popular among cell biologists, can be a very practical and straightforward alternative to DLS to confirm membrane protein insertion. (c) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0731-7085
year published 2009
volume 49
issue 2
beginning page 276
ending page 281
digital object identifier (doi) 10.1016/j.jpba.2008.11.026
web of science category Chemistry, Analytical; Pharmacology & Pharmacy
subject category Chemistry; Pharmacology & Pharmacy
unique article identifier WOS:000263434900014
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