Article (Scientific journals)
Molecular Determinants Of The Interaction Between The C-Terminal Domain Of Alzheimer'S Beta-Amyloid Peptide And Apolipoprotein E Alpha-Helices
Lins, Laurence; Thomas, Annick; Pillot, T. et al.
1999In Journal of Neurochemistry, 73 (2), p. 758-769
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Abstract :
[en] In a previous work, we predicted and demonstrated that the 29-42-residue fragment of beta-amyloid peptide (Abeta peptide) has in vitro capacities close to those of the tilted fragment of viral fusion proteins. We further demonstrated that apolipoprotein E2 and E3 but not apolipoprotein E4 can decrease the fusogenic activity of Abeta(29-42) via a direct interaction. Therefore, we suggested that this fragment is implicated in the neurotoxicity of Abeta and in the protective effects of apolipoprotein E in Alzheimer's disease. Because structurally related apolipoproteins do not interact with the Abeta C-terminal domain but inhibit viral fusion, we suggested that interactions existing between fusogenic peptides and apolipoproteins are selective and responsible for the inhibition of fusion. In this study, we simulated interactions of all amphipathic helices of apolipoproteins E and A-I with Abeta and simian immunodeficiency virus (SIV) fusogenic fragments by molecular modeling. We further calculated cross-interactions that do not inhibit fusion in vitro. The results suggest that interactions of hydrophobic residues are the major event to inhibit the fusogenic capacities of Abeta(29-42) and SIV peptides. Selectivity of those interactions is due to the steric complementarity between bulky hydrophobic residues in the fusogenic fragments and hydrophobic residues in the apolipoprotein C-terminal amphipathic helices.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Lins, Laurence  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Thomas, Annick ;  Université de Liège - ULiège > Chimie et bio-industries > Centre de Bio. Fond. - Section de Biologie moléc. et numér.
Pillot, T.
Vandekerckhove, J.
Rosseneu, M.
Brasseur, Robert ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Language :
English
Title :
Molecular Determinants Of The Interaction Between The C-Terminal Domain Of Alzheimer'S Beta-Amyloid Peptide And Apolipoprotein E Alpha-Helices
Publication date :
1999
Journal title :
Journal of Neurochemistry
ISSN :
0022-3042
eISSN :
1471-4159
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
73
Issue :
2
Pages :
758-769
758-69
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 June 2010

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