Modifications of the 7-Hydroxyl Group of the Transthyretin Ligand Luteolin Provide Mechanistic Insights into Its Binding Properties and High Plasma Specificity
作者:Lina Nilsson、Andreas Larsson、Afshan Begum、Irina Iakovleva、Marcus Carlsson、Kristoffer Brännström、A. Elisabeth Sauer-Eriksson、Anders Olofsson
DOI:10.1371/journal.pone.0153112
日期:——
has been exchanged for a chlorine (7-Cl-Lut) or a methoxy group (7-MeO-Lut). Using an in vitro model, based on human liver microsomes, we verified that these modifications increase the persistence of the drug. Crystal structure determinations show that 7-Cl-Lut binds similarly to luteolin. The larger MeO substituent cannot be accommodated within the same space as the chlorine or hydroxy group and as
血浆蛋白运甲状腺素蛋白(TTR)的淀粉样蛋白形成与家族性淀粉样蛋白多神经病和老年性系统性淀粉样变性有关。配体在其天然激素结合位点内的结合可稳定四聚体结构并损害淀粉样蛋白的形成。我们最近显示,类黄酮木犀草素以很高的选择性稳定人血浆中的TTR。然而,木犀草素通过葡糖醛酸化作用在体内失活,其优选位点是其芳香族A环上7位的羟基。我们已经评估了两种木犀草素变体的性质,其中7-羟基已被氯(7-Cl-Lut)或甲氧基(7-MeO-Lut)交换。使用基于人肝微粒体的体外模型,我们证实了这些修饰增加了药物的持久性。晶体结构测定表明7-Cl-Lut与木犀草素类似地结合。较大的MeO取代基无法容纳在与氯或羟基相同的空间内,结果7-MeO-Lut在相反的方向上结合,位置7的甲氧基面对溶剂。7-Cl-Lut和7-MeO-Lut均可以作为高亲和力结合剂,但与木犀草素相反,它们对其他血浆成分表现出高度非特异性结合。详细