Evaluation of a Cyclopentane-Based γ-Amino Acid for the Ability to Promote α/γ-Peptide Secondary Structure
作者:Michael W. Giuliano、Stacy J. Maynard、Aaron M. Almeida、Andrew G. Reidenbach、Li Guo、Emily C. Ulrich、Ilia A. Guzei、Samuel H. Gellman
DOI:10.1021/jo401501g
日期:2013.12.20
We report the asymmetric synthesis of the gamma-amino acid (1R,2R)-2-aminomethyl-1-cyclopentane carboxylic acid (AMCP) and an evaluation of this residue's potential to promote secondary structure in alpha/gamma-peptides. Simulated annealing calculations using NMR-derived distance restraints obtained for alpha/gamma-peptides in chloroform reveal that AMCP-containing oligomers are conformationally flexible. However, additional evidence suggests that an internally hydrogen-bonded helical conformation is partially populated in solution. From these data, we propose characteristic NOE patterns for the formation of the alpha/gamma-peptide 12/10-helix and discuss the apparent conformational frustration of AMCP-containing oligomers.