Synthetic flavonoid derivatives targeting the glycogen phosphorylase inhibitor site: QM/MM-PBSA motivated synthesis of substituted 5,7-dihydroxyflavones, crystallography, in vitro kinetics and ex-vivo cellular experiments reveal novel potent inhibitors
作者:Ben A. Chetter、Efthimios Kyriakis、Daniel Barr、Aikaterini G. Karra、Elisabeth Katsidou、Symeon M. Koulas、Vassiliki T. Skamnaki、Timothy J. Snape、Anna-Maria G. Psarra、Demetres D. Leonidas、Joseph M. Hayes
DOI:10.1016/j.bioorg.2020.104003
日期:2020.9
agents. Flavonoids are novel inhibitors of GP, but their mode of action is unspecific in terms of the GP binding sites involved. Towards design of synthetic flavonoid analogues acting specifically at the inhibitor site and to exploit the site’s hydrophobic pocket, chrysin has been employed as a lead compound for the in silico screening of 1169 new analogues with different B ring substitutions. QM/MM-PBSA
糖原磷酸化酶(GP)是开发新型抗高血糖药的重要目标。黄酮类化合物是GP的新型抑制剂,但是它们的作用方式在涉及的GP结合位点方面没有特异性。为了设计专门作用于抑制剂位点的合成类黄酮类似物,并利用该位点的疏水口袋,采用了菊花蛋白作为先导化合物,用于计算机筛选1169种具有不同B环取代的新类似物。QM / MM-PBSA结合自由能的计算指导了8种化合物的最终选择,随后使用Baker-Venkataraman重排-环化方法进行合成。针对兔肌肉GPa和GPb以及人肝脏GPa的动力学实验揭示了其中的三种化合物(11,20和43)中的最有效的,其结合在现场(ķ我小号<4μM对于所有三种同种型),和比以前更有效报道的天然类黄酮抑制剂。多次抑制研究表明,仅在抑制剂位点结合。该结合与葡萄糖是协同的,表明抑制作用可以通过血糖水平来调节,并且随着达到正常血糖而降低。化合物43是肝细胞糖原分解的有效抑制剂(IC 50