Conformational analysis of peptides and glycopeptides derived from the consensus sequence for β-O-glucosylation
- Somovilla, V.J. 2
- Martínez-Sáez, N. 2
- Fernández-Tejada, A. 1
- García De La Torre, Beatriz 5
- Andreu, D. 5
- Jiménez-Barbero, J. 136
- Asensio, J.L. 4
- Avenoza, A. 2
- Busto, J.H. 2
- Corzana, F. 2
- Peregrina, J.M. 2
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1
Centro de Investigaciones Biológicas
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2
Universidad de La Rioja
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- 3 IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
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4
Instituto de Química Orgánica General
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5
Universitat Pompeu Fabra
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- 6 Structural Biology Unit, CIC bioGUNE, Parque Tecnologico de Bizkaia Building 801A, Derio, Spain
ISSN: 1568-0266
Year of publication: 2014
Volume: 14
Issue: 23
Pages: 2712-2721
Type: Article
More publications in: Current Topics in Medicinal Chemistry
Abstract
Cys-Xxx-Ser-Xxx-Pro-Cys (Xxx= any amino acid but Pro) is the most common sequence present in naturally occurring peptides and proteins glycosylated with β-O-glucose (β-O-Glc). Taking into account the lack of studies concerning the spatial disposition of this sequence, we have synthesized and analyzed, in aqueous solution, the conformational behavior of peptides and a glycopeptide derived from the particular fragment Cys-Ala-Ser-Ser-Pro-Cys. This sequence is found in the crystal structure of the complex of blood coagulation factor VIIa with soluble tissue factor. Our studies, based on the use of NOESY experiments in combination with molecular dynamics (MD) simulations, indicate that for this particular fragment, initially characterized by a type I β-turn motif, the glycosylation with β-O-Glc forces the peptide backbone into an extended conformation. This conformation is stabilized by the presence of both hydrogen bonds and water pockets between the peptide and the sugar moieties. © 2014 Bentham Science Publishers.