Serine versus Threonine Glycosylation witha-O-GalNAc: Unexpected Selectivity in Their Molecular Recognition with Lectins
- Madariaga, D. 2
- Martínez-Sáez, N. 2
- Somovilla, V.J. 2
- García-García, Laura. 2
- Berbis, M.Á. 1
- Valero-Gónzalez, J. 4
- Martín-Santamaría, S. 3
- Hurtado-Guerrero, R. 4
- Asensio, J.L. 5
- Jiménez-Barbero, J. 1
- 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
Universidad CEU San Pablo
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4
Universidad de Zaragoza
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5
Instituto de Química Orgánica General
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ISSN: 0947-6539
Año de publicación: 2014
Volumen: 20
Número: 39
Páginas: 12616-12627
Tipo: Artículo
beta Ver similares en nube de resultadosOtras publicaciones en: Chemistry - A European Journal
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Resumen
The molecular recognition of several glycopeptides bearing Tn antigen (α-O-GalNAc-Ser or α-O-GalNAc-Thr) in their structure by three lectins with affinity for this determinant has been analysed. The work yields remarkable results in terms of epitope recognition, showing that the underlying amino acid of Tn (serine or threonine) plays a key role in the molecular recognition. In fact, while Soybean agglutinin and Vicia villosa agglutinin lectins prefer Tn-threonine, Helix pomatia agglutinin shows a higher affinity for the glycopeptides carrying Tn-serine. The different conformational behaviour of the two Tn biological entities, the residues of the studied glycopeptides in the close proximity to the Tn antigen and the topology of the binding site of the lectins are at the origin of these differences