Small α/γ-peptides alternating α-aminoisobutyric acid and cyclic γ-amino acid residues are described. NMR studies together with restrained simulated annealing revealed that an extended backbone conformation largely dominates in solution for as short as 4-residues long oligomers. This new fold type is devoid of any hydrogen bond and characterized by a four-fold symmetry.
介绍了交替含有δ-
氨基
异丁酸和环δ-
氨基酸残基的小δ/δ-肽。核磁共振研究和约束模拟退火法发现,对于短至 4 个残基长的寡聚体,在溶液中延伸的骨架构象在很大程度上占主导地位。这种新的折叠类型没有任何氢键,具有四折对称性。