Design and Synthesis of Novel Imidazole-Substituted Dipeptide Amides as Potent and Selective Inhibitors of <i>Candida albicans</i> MyristoylCoA:Protein <i>N</i>-Myristoyltransferase and Identification of Related Tripeptide Inhibitors with Mechanism-Based Antifungal Activity
作者:Balekudru Devadas、Sandra K. Freeman、Mark E. Zupec、Hwang-Fun Lu、Srinivasan R. Nagarajan、Nandini S. Kishore、Jennifer K. Lodge、David W. Kuneman、Charles A. McWherter、Dutt V. Vinjamoori、Daniel P. Getman、Jeffrey I. Gordon、James A. Sikorski
DOI:10.1021/jm970094w
日期:1997.8.1
4-substituted phenacetyl moiety imparts remarkable potency and selectivity to this novel class of inhibitors. The (S,S) stereochemistry of serine and lysine residues is critical for the inhibitory activity, since the (R,R) enantiomer 40 is 10(3)-fold less active than the (S,S) isomer 31. The inhibitory profile exhibited by this new class of NMT ligands is a function of the pKa of the imidazole substituent as
已经发现了新型的抗真菌剂,其通过阻断肉豆蔻酰基辅酶A发挥其活性:蛋白N-肉豆蔻酰基转移酶(NMT; EC 2.1.3.97)。遗传实验已经确定,需要NMT来维持白色念珠菌和新型隐球菌的生存能力,这是免疫功能低下的人体内系统性真菌感染的两个主要原因。从弱八肽抑制剂ALYASKLS-NH2(2,Ki = 15.3 +/- 6.4 microM)开始,已设计并合成了一系列咪唑取代的Ser-Lys二肽酰胺,作为白色念珠菌NMT的有效和选择性抑制剂。导致这些抑制剂的策略是由高亲和力八肽底物GLYASKLS-NH2 1a中那些紧密结合,C端截短,在N末端用间隔基团取代四个氨基酸,并用N-连接的2-甲基咪唑部分取代甘氨酸氨基。初步的结构活性研究导致鉴定出31是一种有效的选择性拟肽抑制剂,相对于人类NMT的IC50为56 nM,选择性为250倍。2-甲基咪唑作为N-末端胺的替代物,与4-取代的苯乙酰基部分