Discovery and Development of a Small Molecule Library with Lumazine Synthase Inhibitory Activity
作者:Arindam Talukdar、Meghan Breen、Adelbert Bacher、Boris Illarionov、Markus Fischer、Gunda Georg、Qi-Zhuang Ye、Mark Cushman
DOI:10.1021/jo900238q
日期:2009.8.7
(E)-5-Nitro-6-(2-hydroxystyryl)pyrimdine-2,4(1H,3H)-dione (9) was identified as a novel inhibitor of Schizosaccharomyces pombe lumazine synthase by high-throughput screening of a 100000 compound library. The K-i of 9 vs Mycobacterium tuberculosis lumazine synthase was 95 mu M. Compound 9 is a structural analogue of the lumazine synthase substrate 5-amino-6-(D-ribitylamino)-2,4-(1H,3H)pyrimidinedione (1). This indicates that the ribitylamino side chain of the substrate is not essential for binding to the enzyme. Optimization of the enzyme inhibitory activity through systematic structure modification of the lead compound 9 led to (E)-5-nitro-6-(4-nitrostyryl)pyrimidine-2,4(1H,3H)-dione (26), which has a K-i of 3.7 mu M vs M. tuberculosis lumazine synthase.
(E)-5-硝基-6-(2-羟基丙二烯酰胺基)亚二噁嗪-2,4-(1H,3H)-双酮(编号9)通过对10万个化合物semble的高通量筛选,被识别为沙拉科斯角藻(Schizosaccharomyces pombe)亚胺合成都酶的新颖抑制剂。与结核菌(Mycobacterium tuberculosis)亚胺合成都酶的比结合位点(K_i)为95 μM。化合物9是亚胺合成都酶底物5-氨基-6-(D-inals-酰氨基)-2,4-(1H,3H)亚二噁嗪-双酮(编号1)的结构模拟物。这表明底物中的n-酰氨基侧链对酶的结合活性并非必不可少。通过系统修改第9号化合物的结构进行酶抑制活性优化,获得(E)-5-硝基-6-(4-硝基丙二烯酰胺基)亚二噁嗪-2,4-(1H,3H)-双酮(编号26)。其与结核菌亚胺合成都酶的比结合位点(K_i)为3.7 μM。