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Solvent polarity controls the helical conformation of short peptides rich in Calpha-tetrasubstituted amino acids

Bellanda M.
•
Mammi S.
•
GEREMIA, SILVANO
altro
Scrimin P.
2007
  • journal article

Periodico
CHEMISTRY-A EUROPEAN JOURNAL
Abstract
The two peptides, rich in Calfatetrasubstituted amino acids, Ac-[AibL-(alfaMe)Val-Aib]2-l-His-NH2 (1) and Ac-[Aib-L-(alfaMe)Val-Aib]2-O-tBu (2a) are prevalently helical. They present the unique property of changing their conformation from the alfa- to the 3 10-helix as a function of the polarity of the solvent: a in more polar solvents, 3 10 in less polar ones. Conclusive evidence of this reversible change of conformation is reported on the basis of the circular dichroism (CD) spectra and a detailed two-dimensional NMR analysis in two solvents (trifluoroethanol and methanol) refined with molecular dynamics calculations. The X-ray diffractometric analysis of the crystals of both peptides reveals that they assume a prevalent 3 10-helix conformation in the solid state. This conformation is practically superimposable on that obtained from the NMR analysis of 1 in methanol. The NMR results further validate the reported CD signature of the 3 10-helix and the use of the CD technique for its assessment.
DOI
10.1002/chem.200600719
WOS
WOS:000243519000004
SCOPUS
2-s2.0-33846217858
Archivio
http://hdl.handle.net/11368/2626251
Diritti
metadata only access
Soggetti
  • helical structures

  • NMR spectroscopy

  • peptides

  • solvent effects

  • structure elucidation...

Web of Science© citazioni
40
Data di acquisizione
Feb 6, 2024
Visualizzazioni
5
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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