A truncated approach to the design of molecular probes from small molecule libraries is outlined, based upon the incorporation of a bioorthogonal marker. The applicability of this strategy to small molecule chemical genetics screens has been demonstrated using analogues of the known stress activated protein kinase (SAPK) pathway activator, anisomycin. Compounds marked with a propargyl group have shown activation of the SAPK pathways comparable to that induced by their parent structures, as demonstrated by immunoblot assays against the downstream target JNK1/2. The considerable advantages of this new approach to molecular probe design have been illustrated through the rapid development of a functionally active fluorescent molecular probe, through coupling of the marked analogues to fluorescent azides using the copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition reaction. Active molecular probes generated in this study were used to investigate cellular uptake through FACS analysis and confocal microscopy.
本文概述了一种从小分子库设计分子探针的简化方法,基于
生物正交标记的结合。通过使用已知的压力激活蛋白激酶(
SAPK)通路激活剂阿尼索霉素的类似物,验证了这种策略在小分子
化学遗传学筛选中的适用性。标记有炔基团的化合物显示出与其母体结构相媲美的
SAPK通路激活效果,这通过对下游靶标JNK1/2的免疫印迹实验得以证明。通过将标记的类似物与荧光
叠氮化合物耦合,利用
铜(I)催化的胡斯根1,3-双极环加成反应,快速开发了一种功能上活跃的荧光分子探针,展现了这种新方法在分子探针设计中的显著优势。本研究中生成的活性分子探针被用于通过流式细胞术分析和共聚焦显微镜研究细胞摄取。