Synthesis, Structure−Activity Relationships, and the Effect of Polyethylene Glycol on Inhibitors of Phosphatidylinositol-Specific Phospholipase C from <i>Bacillus cereus</i>
作者:Margret Ryan、Miles P. Smith、Thottumkara K. Vinod、Wai Leung Lau、John F. W. Keana、O. Hayes Griffith
DOI:10.1021/jm960434y
日期:1996.1.1
Substrate analog inhibitors of Bacillus cereus phosphatidylinositol-specific phospholipase C (PI-PLC) were synthesized and screened for their suitability to map the active site region of the enzyme by protein crystallography. Analogs of the natural substrate phosphatidylinositol (PI) were designed to examine the importance of the lipid portion and the inositol phosphate head group for binding to the
合成蜡状芽孢杆菌磷脂酰肌醇特异性磷脂酶C(PI-PLC)的底物类似物抑制剂,并筛选它们是否适合通过蛋白质晶体学绘制酶的活性位点区域。设计天然底物磷脂酰肌醇(PI)的类似物,以检查脂质部分和肌醇磷酸酯头基团对于与酶结合的重要性。合成化合物在甘油主链的sn-1和sn-2位置包含戊基,己基或己酰基和辛基脂质链,而在sn-3位置包含膦肌醇,膦酸,膦酸甲酯,磷脂酸或磷酸甲酯。疏水性最强的化合物磷酸二辛酯甲酯14也是最好的抑制剂,IC50为12 microM。在一系列的二己基脂质中,具有膦酰基肌醇头基的化合物比不含肌醇但在其他方面相同的化合物具有更强的抑制作用。化合物29是具有膦酰基肌醇头基团的短链脂质,被发现是一种竞争性抑制剂,是该系列中最有效的抑制剂,IC50为18 microM(Ki = 14 microM)。具有二己基链的类似物比具有二己基链的类似物更好的抑制剂,大概是因为醚连接的脂质比酯连接