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Título: | Influence of side chain restriction and NH···π interaction on the β-turn folding modes of dipeptides incorporating phenylalanine cyclohexane derivatives |
Autor: | Jiménez, Ana I. CSIC ORCID; Cativiela, Carlos CSIC ORCID; Gómez-Catalán, Jesús; Pérez, Juan J.; Aubry, André; París, Miguel; Marraud, Michel | Fecha de publicación: | 2000 | Editor: | American Chemical Society | Citación: | Journal of the American Chemical Society 122(24): 5811-5821 (2000) | Resumen: | We have synthesized the model dipeptides Piv-l-Pro-c6Phe-NHiPr, incorporating each of the two cis cyclohexane analogues of phenylalanine: (S,S)- and (R,R)-1-amino-2-phenylcyclohexanecarboxylic acid. Their structural analysis has been carried out in solution by 1H NMR and FTIR absorption spectroscopy and in the solid state by X-ray diffraction. In weakly polar chlorinated solvents, the (S,S)c6Phe-containing dipeptide mainly accommodates a type I β-turn, whereas the (R,R) residue shows a greater propensity to βII-folding. This behavior does not differ significantly from that exhibited by the analogous dipeptides containing l- and d-Phe. However, the l-Pro-l-Phe sequence has been shown to undergo a βI-to-βII transition in the presence of a strong solvating medium, such as DMSO, or in the crystalline state. Interestingly, Piv-l-Pro-(S,S)c6Phe-NHiPr, incorporating its cyclohexane analogue with χ1 fixed at +60°, retains the βI-folded structure under these conditions. Theoretical calculations, supported by the experimental data, indicate that a c6Phe-NH to aromatic π-orbitals interaction has an important influence on the observed β-folding preferences. | Versión del editor: | https://doi.org/10.1021/ja993568k | URI: | http://hdl.handle.net/10261/271862 | DOI: | 10.1021/ja993568k | ISSN: | 0002-7863 |
Aparece en las colecciones: | (ICMA) Artículos |
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