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Does a 2----5 beta-turn structure exist in enkephalins? Study of a fully protected Leu-enkephalin in organic solution
E Moret1, I P Gerothanassis, R N Hunston
1Institut de Chimie Organique, Université de Lausanne, Switzerland.
FEBS Letters
|March 26, 1990
Abstract:
The 17O chemical shifts of the Gly-2 and Gly-3 oxygens of a fully protected Leu-enkephalin were measured to be identical in acetone solution. This allows the conclusion that neither of these peptide oxygens is hydrogen bonded and that no specific 2----5 beta-turn structure exists to an appreciable extent.