Reference : Conformational behaviour of a synthetic peptide of the C-terminus of villin that inte...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
Conformational behaviour of a synthetic peptide of the C-terminus of villin that interacts with actin: an NMR, CD and stimulated annealing study.
Simenel, C. [> >]
Rose, T. [> >]
Goethals, M. [> >]
Vandekerckhove, J. [> >]
Friederich, Evelyne mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit >]
Louvard, D. [> >]
Delepierre, M. [> >]
International journal of peptide and protein research
Yes (verified by ORBilu)
[en] Actins/chemistry ; Amino Acid Sequence ; Calcium-Binding Proteins/chemistry ; Carboxylic Acids ; Carrier Proteins/chemistry ; Circular Dichroism ; Computer Simulation ; Magnetic Resonance Spectroscopy ; Microfilament Proteins/chemistry ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Structure, Secondary ; Temperature
[en] The solution structure of a synthetic 22-amino acid peptide (P1) corresponding to the extreme C-terminal end and one of the F-actin binding sites of villin has been determined by 1H NMR and CD spectroscopy. The structure of this peptide was compared to that of a peptide in which lysine to glutamic acid substitutions were introduced at positions 17 and 19 (P11), abolishing F-actin binding. Both peptides are largely unstructured in aqueous solution. Changes observed in the NMR and CD spectra of both peptides are consistent with alpha-helix formation in trifluoroethanol/water mixtures. A set of 189 interproton distances derived from nuclear Overhauser enhancement (NOE) measurements, 17 phi-angle constraints obtained from 3JNH alpha coupling constants, as well as about 10 N ... O distance restraints deduced from amide proton exchange kinetics with deuterium, were used for the structure determination. The three-dimensional structure of P1 and P11 is characterized by two helical regions, one extending from residues 2 to 5 and a second covering residues 7 to 17. The central fragment, ranging from Leu-7 to Leu-15, is more stable. The C-terminal residues are less structured, particularly within peptide P11. The significance of these structural results is discussed in relation to the biological activity of villin.

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