Article (Scientific journals)
The C-terminal helix of human apolipoprotein AII promotes the fusion of unilamellar liposomes and displaces apolipoprotein AI from high-density lipoproteins.
Lambert, Géraldine; Decout, A.; Vanloo, B. et al.
1998In European Journal of Biochemistry, 253 (1), p. 328-38
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Keywords :
Amino Acid Sequence; Apolipoprotein A-I/metabolism; Apolipoprotein A-II/chemistry/metabolism/pharmacology; Humans; Lipoproteins, HDL/metabolism; Liposomes; Membrane Fusion/drug effects; Models, Molecular; Molecular Sequence Data; Peptide Fragments/chemistry/metabolism/pharmacology; Protein Conformation; Protein Structure, Secondary
Abstract :
[en] To assess the functional properties of apolipoprotein (apo) AII and to investigate the mechanism leading to the displacement of apo AI from native and reconstituted high-density lipoproteins (HDL and r-HDL) by apo AII, wild-type and variant apo AII peptides were synthesized. The wild-type peptides, residues 53-70 and 58-70, correspond to the C-terminal helix of apo AII and are predicted to insert at a tilted angle into a lipid bilayer. We demonstrate that both the apo AII-(53-70) peptide, and to a lesser extent the apo AII-(58-70) peptide are able to induce fusion of unilamellar lipid vesicles together with membrane leakage, and to displace apo AI from HDL and r-HDL. Two variants of the apo AII-(53-70)-wild-type (WT) peptide, designed either to be parallel to the water/lipid interface [apo AII-(53-70)-0 degrees] or to retain an oblique orientation [apo AII-(53-70)-30 degrees], were synthesized in order to test the influence of the obliquity on their fusogenic properties and ability to displace apo AI from HDL. The parallel variant did not bind lipids, due to its self-association properties. However, the apo AII-(53-70)-30 degrees variant was fusogenic and promoted the displacement of apo AI from HDL. Moreover, the extent of fusion of the apo AII-(53-70)-WT, apo AII-(58-70)-WT and apo AII-(53-70)-30 degrees peptides was related to the alpha-helical content of the lipid-bound peptides measured by infrared spectroscopy. Infrared measurements using polarized light also confirmed the oblique orientation of the helical component of the three peptides. In native and r-HDL, the tilted insertion of the C-terminal helix of apo AII resulting in a partial destabilization of the HDL external lipid layer might contribute to the displacement of apo AI by apo AII.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Lambert, Géraldine ;  Centre Hospitalier Universitaire de Liège - CHU > Anesthésie et réanimation
Decout, A.
Vanloo, B.
Rouy, D.
Duverger, N.
Kalopissis, A.
Vandekerckhove, J.
Chambaz, J.
Brasseur, Robert ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Rosseneu, M.
Language :
English
Title :
The C-terminal helix of human apolipoprotein AII promotes the fusion of unilamellar liposomes and displaces apolipoprotein AI from high-density lipoproteins.
Publication date :
1998
Journal title :
European Journal of Biochemistry
ISSN :
0014-2956
eISSN :
1432-1033
Publisher :
Blackwell Science, Oxford, United Kingdom
Volume :
253
Issue :
1
Pages :
328-38
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 June 2010

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