Synthesis, Biological Evaluation, and Crystallographic Studies of Extended Guanine-Based (lin-Benzoguanine) Inhibitors for tRNA-Guanine Transglycosylase (TGT)
作者:Emmanuel A. Meyer、Nicola Donati、Marine Guillot、W. Bernd Schweizer、François Diederich、Bernhard Stengl、Ruth Brenk、Klaus Reuter、Gerhard Klebe
DOI:10.1002/hlca.200690062
日期:2006.4
This paper describes the rational design, synthesis, and biological evaluation of a new generation of inhibitors of the bacterial enzyme tRNA-guanine transglycosylase (TGT), which has been identified as a new target in the fight against bacillary dysentery (Shigellosis). The enzyme catalyzes the exchange of guanine in the anticodon wobble position of tRNA by the modified base preQ1, a guanine derivative
本文描述了新一代细菌酶tRNA-鸟嘌呤转糖基酶(TGT)抑制剂的合理设计,合成和生物学评估,该抑制剂已被确定为对抗细菌性痢疾(志贺氏菌病)的新目标。根据涉及共价TGT-tRNA中间体的乒乓机制,该酶通过修饰的碱基preQ 1(鸟嘌呤衍生物)催化tRNA的反密码子摆动位置中的鸟嘌呤交换(图2)。基于计算机建模(图3),林-benzoguanine(6-氨基咪唑并[4,5-克]喹唑啉-8-(7 ħ) -酮(2))被选作延伸的中心支架,与该蛋白质形成多达七个平面内分子间H键,同时夹在Tyr106和Met260之间。多功能的合成方案被用于合成开发2,和用苯基,苄基和2-苯乙基侧链(衍生物即,16,17A,和12A,12B,13,17,RESP)伸进林立的亲脂性口袋由Val282,Val45和Leu68设计(方案1-3)。考虑到新配体的溶解度有限,并且由于最近对TGT催化机理的详细了解(图2),对酶