The role of the disulfide bond in amyloid-like fibrillogenesis in a model peptide system
作者:Apurba Kumar Das、Michael G. B. Drew、Debasish Haldar、Arindam Banerjee
DOI:10.1039/b509083k
日期:——
Three terminally protected short peptides Bis[Boc-D-Leu1-Cys2-OMe] 1, Bis[Boc-Leu1-Cys2-OMe] and Bis[Boc-Val1-Cys2-OMe] 3 exhibit amyloid-like fibrillar morphology. Single crystal X-ray diffraction analysis of peptide 1 clearly demonstrates that it adopts an overall extended backbone molecular conformation that self-assembles to form an intermolecular hydrogen-bonded antiparallel supramolecular beta-sheet
三个末端保护的短肽Bis [Boc-D-Leu1-Cys2-OMe] 1,Bis [Boc-Leu1-Cys2-OMe]和Bis [Boc-Val1-Cys2-OMe] 3表现出淀粉样原纤维形态。肽1的单晶X射线衍射分析清楚地表明,它采用了整体扩展的骨架分子构象,该构象自组装以在晶体中形成分子间氢键合的反平行超分子β-折叠结构。扫描电子显微镜(SEM)图像,透射电子显微镜(TEM)图像和刚果红结合研究生动地证明了肽1、2和3的淀粉样样原纤维形成。但是,在肽1、2和3的二硫键还原后3,三个新生成的肽Boc-D-Leu1-Cys2-OMe 4,