Pterin–sulfa conjugates as dihydropteroate synthase inhibitors and antibacterial agents
作者:Ying Zhao、William R. Shadrick、Miranda J. Wallace、Yinan Wu、Elizabeth C. Griffith、Jianjun Qi、Mi-Kyung Yun、Stephen W. White、Richard E. Lee
DOI:10.1016/j.bmcl.2016.07.006
日期:2016.8
The sulfonamide class of antibiotics has been in continuous use for over 70years. They are thought to act by directly inhibiting dihydropteroate synthase (DHPS), and also acting as prodrugs that sequester pterin pools by forming dead end pterin-sulfonamide conjugates. In this study, eight pterin-sulfonamide conjugates were synthesized using a novel synthetic strategy and their biochemical and microbiological
磺酰胺类抗生素已连续使用了70多年。人们认为它们通过直接抑制二氢蝶呤合酶(DHPS)起作用,并且还可以作为前药,通过形成死角的蝶呤-磺酰胺结合物来隔离蝶呤池。在这项研究中,使用一种新颖的合成策略合成了八种蝶呤-磺酰胺共轭物,并研究了它们的生化和微生物学特性。结合物显示出竞争性抑制DHPS,并且焦磷酸的存在增强了抑制作用,焦磷酸对催化至关重要,并且已知能促进DHPS活性位点的有序化。鼠疫耶尔森氏菌DHPS的共晶体结构与一种更有效的结合物结合后,显示出与酶促产物类似物蝶酸相似的结合模式。在存在和不存在叶酸前体和依赖性代谢产物的情况下,测定了蝶呤-磺酰胺结合物对大肠杆菌的抗菌活性。这些结果表明,缀合物具有明显的抗菌活性,并通过靶标抗叶酸途径机制起作用,而不是作为简单的死角产物。