The binding of β-d-glucopyranosyl-thiosemicarbazone derivatives to glycogen phosphorylase: A new class of inhibitors
作者:Kyra-Melinda Alexacou、Alia-Cristina Tenchiu (Deleanu)、Evangelia D. Chrysina、Maria-Despoina Charavgi、Ioannis D. Kostas、Spyros E. Zographos、Nikos G. Oikonomakos、Demetres D. Leonidas
DOI:10.1016/j.bmc.2010.09.039
日期:2010.11.15
glucosyl thiosemicarbazones possess a moiety derived from substituted benzaldehydes with NO2, F, Cl, Br, OH, OMe, CF3, or Me at the ortho-, meta- or para-position of the aromatic ring as well as a moiety derived from 4-pyridinecarboxaldehyde. These fit tightly into the β-pocket, a side channel from the catalytic site with no access to the bulk solvent. The differences in their inhibitory potency can be interpreted
糖原磷酸化酶(GP)是治疗2型糖尿病的有希望的靶标。在GP的基于结构的药物设计过程中,合成了15种芳香醛4-(β- d-吡喃葡萄糖基)硫代半氨基甲酮,并通过动力学研究对其作为兔肌肉糖原磷酸化酶b(GPb)的抑制剂进行了评估。这些化合物是具有IC 50的关于α - d-葡萄糖-1-磷酸的GPb竞争性抑制剂值范围为5.7至524.3μM。为了阐明其抑制作用的结构基础,测定了这些化合物与GPb的复合物的晶体结构,分离度为1.95–2.23Å。复杂的结构表明,抑制剂被安置在催化位点,其中吡喃葡萄糖基部分的位置与α- d-葡萄糖大致相同,并稳定了280s环的T构象。所研究的葡糖缩氨基硫脲的缩氨基硫脲部分具有从取代苯甲醛与衍生NO的部分2,F,氯,溴,OH,青梅,CF 3在,或Me邻- ,间位-或对位芳环的-位以及衍生自4-吡啶甲醛的部分。它们紧密地装配在β袋中,β袋是催化位点的侧通道,无法接触大量溶