Left-Handed Helical Preference in an Achiral Peptide Chain Is Induced by an <scp>l</scp>-Amino Acid in an N-Terminal Type II β-Turn
作者:Matteo De Poli、Marta De Zotti、James Raftery、Juan A. Aguilar、Gareth A. Morris、Jonathan Clayden
DOI:10.1021/jo302705k
日期:2013.3.15
Oligomers of the achiral amino acid Aib adopt helical conformations in which the screw-sense may be controlled by a single N-terminal residue. Using crystallographic and NMR techniques, we show that the left- or right-handed sense of helicalinduction arises from the nature of the β-turn at the N terminus: the tertiary amino acid l-Val induces a left-handed type II β-turn in both the solid state and