Inhibition studies on Mycobacterium tuberculosis N-acetylglucosamine-1-phosphate uridyltransferase (GlmU)
作者:Anh Thu Tran、Daying Wen、Nicholas P. West、Edward N. Baker、Warwick J. Britton、Richard J. Payne
DOI:10.1039/c3ob41896k
日期:——
Peptidoglycan is an essential component of the cell wall of bacteria, including Mycobacterium tuberculosis, that provides structural strength and rigidity to enable internal osmotic pressure to be withstood. The first committed step in the biosynthesis of peptidoglycan involves the formation of uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc) from uridine triphosphate (UTP) and GlcNAc-1-phosphate. This reaction is catalysed by N-acetylglucosamine-1-phosphate uridyltransferase (GlmU), a bifunctional enzyme with two independent active sites that possess acetyltransferase and uridyltransferase activities. Herein, we report the first inhibition study targeted against the uridyltransferase activity of M. tuberculosis GlmU. A number of potential inhibitors were initially prepared leading to the discovery of active aminoquinazoline-based compounds. The most potent inhibitor in this series exhibited an IC50 of 74 μM against GlmU uridyltransferase activity and serves as a promising starting point for the discovery of more potent inhibitors.
肽聚糖是细菌细胞壁的重要组成部分,包括结核分枝杆菌,它为细胞提供结构强度和刚性,以抵御内部渗透压。肽聚糖生物合成中的第一个关键步骤是尿苷二磷酸-N-乙酰氨基葡萄糖(UDP-GlcNAc)从尿苷三磷酸(UTP)和GlcNAc-1-磷酸形成。此反应由N-乙酰氨基葡萄糖-1-磷酸尿苷转移酶(GlmU)催化,GlmU是一种双功能酶,具有两个独立的活性位点,分别具备乙酰转移酶和尿苷转移酶活性。在此,我们报告了针对结核分枝杆菌GlmU的尿苷转移酶活性的首次抑制研究。最初准备了一些潜在抑制剂,导致发现了活性氨基喹唑啉类化合物。在这一系列中,最有效的抑制剂对GlmU尿苷转移酶活性的IC50为74μM,是发现更高效抑制剂的良好起点。