Design of Substrate Transmembrane Mimetics as Structural Probes for γ-Secretase
作者:Sanjay Bhattarai、Sujan Devkota、Kathleen M. Meneely、Minli Xing、Justin T. Douglas、Michael S. Wolfe
DOI:10.1021/jacs.9b13405
日期:2020.2.19
γ-secretase. Moreover, enzyme inhibition kinetics and photoaffinity probe displacement experiments demonstrate that both the docking exosite and the active site are engaged by the bipartite inhibitors. The solution conformations of these potent transmembrane-mimetic inhibitors are similar to those of bound natural substrates, suggesting these probes are preorganized for high-affinity binding and should
γ-分泌酶是一种膜包埋的天冬氨酰蛋白酶复合物,在生物学和医学中处于核心地位。这种酶如何识别跨膜底物并催化脂双层中的水解尚不清楚。模拟整个底物跨膜结构域并与活性位点结合的抑制剂应该为结构生物学提供重要的工具,从而深入了解底物门控和捕获处于活性状态的蛋白酶。在这里,我们报告了 γ-分泌酶复合物的跨膜肽模拟抑制剂,其包含一个 N 端螺旋肽区域,该区域与底物对接外位点和 C 端过渡态类似物部分结合,靶向活性位点。γ-分泌酶的化学计量抑制需要这两个区域。而且,酶抑制动力学和光亲和探针置换实验表明,对接的外部位点和活性位点都被二分抑制剂接合。这些有效的跨膜模拟抑制剂的溶液构象与结合的天然底物的溶液构象相似,表明这些探针是为高亲和力结合而预先组织的,并且应该允许通过冷冻电子可视化准备用于膜内蛋白水解的活性 γ-分泌酶复合物显微镜。
Design of Transmembrane Mimetic Structural Probes to Trap Different Stages of γ-Secretase–Substrate Interaction
作者:Sanjay Bhattarai、Sujan Devkota、Michael S. Wolfe
DOI:10.1021/acs.jmedchem.1c01395
日期:2021.10.28
substrate, identifying potent inhibitors for each class. These TMD mimetics exhibited non-competitive inhibition and occupy both the exosite and the activesite, as demonstrated by inhibitor cross-competition experiments and photoaffinity probe binding assays. The new probes should be important structural tools for trapping different stages of substrate recognition and processing via ongoing cryo-electron
This invention relates to compounds, and in particular to polypeptides, their use and methods for their production. The polypeptides are produced from “pseudo-cystein” amino acids that facilitate the assembly of polypeptides by native chemical ligation. The invention provides a compound comprising a polypeptide, the polypeptide having at a C-terminal end a pseudo amino acid, the pseudo amino acid having a side chain containing a 1-amino-2-thiol moiety. For example the polypeptide comprises the structure: formula (I) wherein: R is a polypeptide chain; X is a linker.