作者:Gangavaram V. M. Sharma、Thota Anupama Yadav、Kanakaraju Marumudi、Prashanth Thodupunuri、Pothula Purushotham Reddy、Ajit C. Kunwar
DOI:10.1002/asia.201402465
日期:2014.11
at the C terminus nucleated by a robust 12/10‐mixed helix, thus providing a ‘helix‐turn’ (HT) motif. The turn and the helix were additionally stabilized by intraresidue electrostatic interaction between the furan oxygen in the carbohydrate side chain and NH in the backbone. However, the hexapeptide with a β‐hGly residue at the N terminus demonstrated the presence of a 10/12 helix through its entire
提出了一个新的由12/10混合螺旋成核的β肽三残基转折。在此设计中,β肽源自C连接的碳-β-氨基酸酯[BocNH-(R)-β-Caa (r) -OMe](Boc =叔丁氧羰基)的1:1交替。由A d -核糖呋喃糖苷侧链和β-hGly残基。与(六肽- [R)-β-CAA (R)在N末端显示由14元NH(4)稳定'转' ⋅⋅⋅C(6)氢键在C末端被坚固的12/10混合螺旋形核,从而提供了“螺旋转角”(HT)图案。碳水化合物侧链中的呋喃氧与主链中的NH之间的残基内静电相互作用进一步稳定了转角和螺旋。然而,在N末端带有β-hGly残基的六肽在其整个长度上显示出10/12螺旋的存在,这再次表明了NH与呋喃氧之间的残基内部相互作用。所述intraresidue NH ⋅⋅⋅ Ó 在单体中观察我的静电相互作用,然而,在所述肽不存在。