In the Search of Glycogen Phosphorylase Inhibitors: Synthesis of C-D-Glycopyranosylbenzo(hydro)quinones – Inhibition of and Binding to Glycogen Phosphorylase in the Crystal
作者:Li He、Yun Zhi Zhang、Marcelle Tanoh、Guo-Rong Chen、Jean-Pierre Praly、Evangelia D. Chrysina、Costas Tiraidis、Magda Kosmopoulou、Demetres D. Leonidas、Nikos G. Oikonomakos
DOI:10.1002/ejoc.200600548
日期:2007.2
23 were found to be competitive inhibitors of rabbit muscle glycogen phosphorylase b (GPb), with respect to the substrate α-D-glucose-1-phosphate, with Ki values of 1.3 and 0.9 mM, respectively, whereas C-β-D-glucosylhydroquinone 17 was not effective up to a concentration of 8 mM. In order to elucidate the structural basis of inhibition, we determined the crystal structures of 19 and 23 in complex
五-O-乙酰基-β-D-吡喃葡萄糖和 1,4-二甲氧基苯通过亲电取代选择性引导为 C-β-D-吡喃葡萄糖基-1,4-二甲氧基苯,通过简单有效的反应(氧化、还原和脱乙酰化)转化为 C-β-D-吡喃葡萄糖基-1,4-二甲氧基苯) 到相应的 C-糖基氢-和 C-糖基苯醌,具有乙酰化或脱保护的糖部分。发现 C-β-D-葡萄糖基苯醌 19 和 C-β-D-葡萄糖基氢醌 23 是兔肌糖原磷酸化酶 b (GPb) 的竞争性抑制剂,相对于底物 α-D-葡萄糖-1-磷酸,Ki值分别为 1.3 和 0.9 mM,而 C-β-D-葡糖基氢醌 17 在浓度高达 8 mM 时无效。为了阐明抑制的结构基础,我们确定了 19 和 23 与 GPb 复合物在 2.03-2 的晶体结构。05 决议。复杂的结构表明抑制剂可以容纳在与 α-D-葡萄糖大致相同的位置的催化位点,并通过与该环的 Asp283 和 Asn284 的几个有利接触来稳定