Structure-Based Design of Novel Pyrimido[4,5-c]pyridazine Derivatives as Dihydropteroate Synthase Inhibitors with Increased Affinity
作者:Ying Zhao、Dalia Hammoudeh、Mi-Kyung Yun、Jianjun Qi、Stephen W. White、Richard E. Lee
DOI:10.1002/cmdc.201200049
日期:2012.5
Dihydropteroate synthase (DHPS) is the validated drug target for sulfonamide antimicrobial therapy. However, due to widespread drug resistance and poor tolerance, the use of sulfonamide antibiotics is now limited. The pterin binding pocket in DHPS is highly conserved and is distinct from the sulfonamide binding site. It therefore represents an attractive alternative target for the design of novel antibacterial
二氢蝶酸合酶 (DHPS) 是磺胺类抗菌治疗的有效药物靶点。然而,由于普遍存在耐药性和耐受性差,目前磺胺类抗生素的使用受到限制。DHPS 中的蝶呤结合口袋高度保守,与磺胺结合位点不同。因此,它代表了设计新型抗菌剂的有吸引力的替代目标。我们之前在炭疽芽孢杆菌顺式 DHPS 蝶呤位点中对已知哒嗪抑制剂进行了结构表征,并确定了许多不利的相互作用,这些相互作用似乎会损害结合。有了这些结构信息,一系列 4,5-dioxo-1,4,5,6-tetrahydropyrimido[4,5- c]哒嗪旨在提高结合亲和力。最重要的是,去除了N-甲基环取代以改善蝶呤口袋内的结合,并且优化了侧链羧酸的长度以完全接合焦磷酸结合位点。这些抑制剂是通过酶活性测定、X 射线晶体学、等温量热法和表面等离子体共振合成和评估的,以从结构、动力学和热力学角度全面了解结合相互作用。该研究清楚地表明,缺乏N-甲基取代的化合物对 DHPS