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. 2005 Mar 9;127(9):2974-83.
doi: 10.1021/ja0456003.

Single turn peptide alpha helices with exceptional stability in water

Nicholas E Shepherd  1 , Huy N Hoang, Giovanni Abbenante, David P Fairlie
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Single turn peptide alpha helices with exceptional stability in water

Nicholas E Shepherd et al. J Am Chem Soc. .

Abstract

Cyclic pentapeptides are not known to exist in alpha-helical conformations. CD and NMR spectra show that specific 20-membered cyclic pentapeptides, Ac-(cyclo-1,5) [KxxxD]-NH(2) and Ac-(cyclo-2,6)-R[KxxxD]-NH(2), are highly alpha-helical structures in water and independent of concentration, TFE, denaturants, and proteases. These are the smallest alpha-helical peptides in water.

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