Article (Scientific journals)
Peptide-surfactant interactions: A combined spectroscopic and molecular dynamics simulation approach
Roussel, G.; Caudano, Y.; Matagne, André et al.
2018In Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, 190, p. 464-470
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Keywords :
Molecular dynamics; Peptides; SDS; Spectroscopy; Surfactant; Dyes; Proteins; Surface active agents; Computational approach; Critical aggregation concentration; Different mechanisms; Molecular dynamics simulations; Native structures; Secondary structures; Surfactant interaction; Tertiary structures
Abstract :
[en] In the present contribution, we report a combined spectroscopic and computational approach aiming to unravel at atomic resolution the effect of the anionic SDS detergent on the structure of two model peptides, the α-helix TrpCage and the β-stranded TrpZip. A detailed characterization of the specific amino acids involved is performed. Monomeric (single molecules) and micellar SDS species differently interact with the α-helix and β-stranded peptides, emphasizing the different mechanisms occurring below and above the critical aggregation concentration (CAC). Below the CAC, the α-helix peptide is fully unfolded, losing its hydrophobic core and its Asp-Arg salt bridge, while the β-stranded peptide keeps its native structure with its four Trp well oriented. Above the CAC, the SDS micelles have the same effect on both peptides, that is, destabilizing the tertiary structure while keeping their secondary structure. Our studies will be helpful to deepen our understanding of the action of the denaturant SDS on peptides and proteins. © 2017 Elsevier B.V.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Roussel, G.;  Department of Physiology and Biophysics, University of California, D340 Medical Sciences I, Irvine, CA, United States
Caudano, Y.;  Research Centre in Physics of Matter and Radiation (PMR), University of Namur, 61 Rue de Bruxelles, Namur, Belgium
Matagne, André  ;  Université de Liège - ULiège > Département des sciences de la vie > Enzymologie et repliement des protéines
Sansom, M. S.;  Department of Biochemistry, University of Oxford, South Park Road, Oxford, United Kingdom
Perpète, E. A.;  Laboratory of Physical Chemistry of Biomolecules, Unité de Chimie Physique Théorique et Structurale (UCPTS), University of Namur, 61, Rue de Bruxelles, Namur, Belgium
Michaux, Charles ;  Université de Liège - ULiège > Département des productions animales (DPA) > Nutrition des animaux domestiques
Title :
Peptide-surfactant interactions: A combined spectroscopic and molecular dynamics simulation approach
Publication date :
2018
Journal title :
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
ISSN :
1386-1425
Publisher :
Elsevier B.V.
Volume :
190
Pages :
464-470
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
UNamur - Université de Namur [BE]
Available on ORBi :
since 13 February 2018

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