A New Strategy to Induce γ-Turns: Peptides Composed of Alternating α-Aminoxy Acids and α-Amino Acids
- 1 October 2003
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 125 (43) , 13018-13019
- https://doi.org/10.1021/ja036136p
Abstract
It is known that the seven-membered-ring intramolecular hydrogen bond (γ-turn) is seldom formed in naturally occurring peptides composed of α-amino acids. Here we report a new strategy to induce γ-turns in short linear peptides. We designed and synthesized several peptides (1−5) containing alternating α-l-aminoxy acids and α-d-amino acids. 1H NMR studies revealed that the γ-turn could be initiated by the following N−O turn, an eight-membered-ring intramolecular hydrogen bond induced by an α-aminoxy acid. Moreover, NOESY and CD studies suggested peptides 4 and 5 form a novel secondary structure, a mixed 7−8 helix. Theoretical calculations on several di-, tri-, and tetrapeptide models provided strong support to the above conclusions.Keywords
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