Discovery of a quorum sensing modulator pharmacophore by 3D small-molecule microarray screening
作者:David M. Marsden、Rebecca L. Nicholson、Mette E. Skindersoe、Warren R. J. D. Galloway、Hannah F. Sore、Michael Givskov、George P. C. Salmond、Mark Ladlow、Martin Welch、David R. Spring
DOI:10.1039/c0ob00300j
日期:——
The screening of large arrays of drug-like small-molecules was traditionally a time consuming and resource intensive task. New methodology developed within our laboratories provides an attractive low cost, 3D microarray-assisted screening platform that could be used to rapidly assay thousands of compounds. As a proof-of-principle the platform was exploited to screen a number of quorum sensing analogs. Quorum sensing is used by bacterium to initiate and spread infection; in this context its modulation may have significant clinical value. 3D microarray slides were probed with fluorescently labeled ligand-binding domains of the LuxR homolog CarR from Erwinia carotovora subsp. carotovora. The 3D microarray platform was used to discover the biologically active chloro-pyridine pharmacophore, which was validated using a fluorometric ligand binding assay and ITC. Analogs containing the chloro-pyridine pharmacophore were found to be potent inhibitors of N-acyl-homoserine-lactone (AHL) mediated quorum sensing phenotypes in Serratia (IC50 = ∼5 μM) and Pseudomonas aeruginosa (IC50 = 10–20 μM).
筛选大量类药物小分子的工作传统上是一个耗时且资源密集的任务。在我们的实验室中开发的新方法提供了一种经济划算的3D微阵列辅助筛选平台,可以快速检测成千上万的化合物。作为原理验证,该平台被用来筛选多种群体感应类似物。群体感应是细菌用来启动和传播感染的机制;在这个背景下,调节它可能具有重要的临床价值。3D微阵列载片使用了来自土壤腐生菌Erwinia carotovora subsp. carotovora的LuxR同源物CarR的荧光标记配体结合结构域进行探测。该3D微阵列平台用于发现生物活性的氯吡啶药效团,并通过荧光配体结合测定和等温量热法(ITC)进行了验证。含有氯吡啶药效团的类似物被发现能够有效抑制Serratia(IC50 ≈ 5 μM)和铜绿假单胞菌(Pseudomonas aeruginosa)(IC50 = 10–20 μM)中N-酰基同源肉桂酸内酯(AHL)介导的群体感应表型。