Inhibition of <scp>dd</scp>-Peptidases by a Specific Trifluoroketone: Crystal Structure of a Complex with the <i>Actinomadura</i> R39 <scp>dd</scp>-Peptidase
作者:Liudmila Dzhekieva、S. A. Adediran、Raphael Herman、Frédéric Kerff、Colette Duez、Paulette Charlier、Eric Sauvage、R. F. Pratt
DOI:10.1021/bi400048s
日期:2013.3.26
was a potent inhibitor, but rather unexpectedly from precedent, the trifluoroketone [d-α-aminopimelyl(1,1,1-trifluoro-3-amino)butan-2-one] was also very effective. Taking into account competing hydration, we found the trifluoroketone was the strongest inhibitor of the Actinomadura R39 dd-peptidase, with a subnanomolar (free ketone) inhibition constant. A crystal structure of the complex between the
细菌抑制剂DD -peptidases代表潜在的抗生素。在寻求替代β内酰胺类,我们已经调查了一系列设计成在与反应,以生成过渡态类似物的结构的化合物的DD -peptidases。该化合物包含肽聚糖模拟物特异性手柄和能够将四面体阴离子递送至酶活性位点的弹头的组合。后者包括一种硼酸、两种醇、一种醛和一种三氟酮。针对两种低分子量 C 类dd -肽酶测试了化合物。正如之前的观察所预期的那样,硼酸是一种有效的抑制剂,但出乎意料的是,三氟酮 [ d-α-aminopimelyl(1,1,1-trifluoro-3-amino)butan-2-one] 也非常有效。考虑到竞争的水合作用,我们发现trifluoroketone是最强的抑制剂马杜拉放线R39 DD 1-肽,具有亚纳摩尔(游离酮)抑制常数。三氟酮和 R39 酶之间的复合物的晶体结构表明,确实与活性位点丝氨酸亲核试剂形成了四面体加合物。的t