Article (Scientific journals)
Fusogenic Alzheimer'S Peptide Fragment A Beta (29-42) In Interaction With Lipid Bilayers: Secondary Structure, Dynamics, And Specific Interaction With Phosphatidyl Ethanolamine Polar Heads As Revealed By Solid-State Nmr
Ravault, S.; Soubias, O.; Saurel, O. et al.
2005In Protein Science: A Publication of the Protein Society, 14 (5), p. 1181-1189
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Abstract :
[en] The interaction of the native Alzheimer's peptide C-terminal fragment Abeta (29-42), and two mutants (G33A and G37A) with neutral lipid bilayers made of POPC and POPE in a 9:1 molar ratio was investigated by solid-state NMR. This fragment and the lipid composition were selected because they represent the minimum requirement for the fusogenic activity of the Alzheimer's peptide. The chemical shifts of alanine methyl isotropic carbon were determined by MAS NMR, and they clearly demonstrated that the major form of the peptide equilibrated in membrane is not in a helical conformation. (2)H NMR, performed with acyl chain deuterated POPC, demonstrated that there is no perturbation of the acyl chain's dynamics and of the lipid phase transition temperature. (2)H NMR, performed with alanine methyl-deuterated peptide demonstrated that the peptide itself has a limited mobility below and above the lipid phase transition temperature (molecular order parameter equal to 0.94). MAS (31)P NMR revealed a specific interaction with POPE polar head as seen by the enhancement of POPE phosphorus nuclei T(2) relaxation. All these results are in favor of a beta-sheet oligomeric association of the peptide at the bilayer interface, preferentially recruiting phosphatidyl ethanolamine polar heads.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Ravault, S.
Soubias, O.
Saurel, O.
Thomas, Annick ;  Université de Liège - ULiège > Chimie et bio-industries > Centre de Bio. Fond. - Section de Biologie moléc. et numér.
Brasseur, Robert ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Milon, A.
Language :
English
Title :
Fusogenic Alzheimer'S Peptide Fragment A Beta (29-42) In Interaction With Lipid Bilayers: Secondary Structure, Dynamics, And Specific Interaction With Phosphatidyl Ethanolamine Polar Heads As Revealed By Solid-State Nmr
Publication date :
2005
Journal title :
Protein Science: A Publication of the Protein Society
ISSN :
0961-8368
eISSN :
1469-896X
Publisher :
Wiley-Blackwell, United States - New York
Volume :
14
Issue :
5
Pages :
1181-1189
1181-9
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 June 2010

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