In Silico Discovery and Validation of Amide Based Small Molecule Targeting the Enzymatic Site of Shiga Toxin
作者:Vinita Chauhan、Dilip Chaudhary、Uma Pathak、Nandita Saxena、Ram Kumar Dhaked
DOI:10.1021/acs.jmedchem.6b01517
日期:2016.12.8
Shiga toxin (Stx), a category B biothreat agent, is a ribosome inactivating protein and toxic to human and animals. Here, we designed and synthesized small molecules that block the active site of the Stx A subunit. On the basis of binding energy, 20 molecules were selected for synthesis and evaluation. These molecules were primarily screened using fluorescence-based thermal shift assay and in vitro
志贺毒素(Stx)是B类生物威胁剂,是一种核糖体失活蛋白,对人和动物有毒。在这里,我们设计和合成了小分子,它们阻断了Stx A亚基的活性位点。基于结合能,选择了20个分子用于合成和评估。这些分子主要使用基于荧光的热位移分析进行筛选,并在Vero细胞中进行体外筛选。在32个分子(包括报告的12个分子)中,有6个分子提供了保护,IC 50为2.60–23.90μM。4-硝基-N- [2-(2-(苯基硫烷基乙基氨基)乙基]苯甲酰胺盐酸盐是最有效的IC 50抑制剂在7.96μM的条件下,选择性指数为22.23,优于任何已知的Stx小分子抑制剂。与Stx的预温育可对小鼠的志贺毒素提供完全保护。表面等离子体共振分析进一步证实了这些分子与Stx A亚基特异性结合。继续进行进一步的优化以鉴定在体内有效的潜在候选物。