Tetrahedron Letters p. 3039 - 3042 (1997)
Update date:2022-08-04
Topics:
Hayashi, Takashi
Asai, Tomohito
Ogoshi, Hisanobu
In order to evaluate the influence of cyclic secondary amino acids on the stability of β-turn structure, we have prepared Ac-Gly-L-Xxx-L-Leu-Gly-N(CH3)2 (Xxx = Aze, 4-membered ring: 1, Xxx = Pro, 5-membered ring: 2, Xxx = Pip, 6-membered ring: 3). The NOE cross peaks that support β-turn structure were observed in 1-3. The NOE cross peak between both terminals of the synthetic peptides, however, was observed only in the NOESY spectra of 2. This result indicates that 5-membered ring side chain in proline plays a very important role in the formation of β-hairpin structure.
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