Functional mimicry revealed by the crystal structure of an eIF4A:RNA complex bound to the interfacial inhibitor, desmethyl pateamine A.

Functional mimicry revealed by the crystal structure of an eIF4A:RNA complex bound to the interfacial inhibitor, desmethyl pateamine A.
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DOI:
10.1016/j.chembiol.2020.12.006
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发表时间:
2021-06-17
影响因子:
8.6
通讯作者:
Pelletier J
Pelletier J
中科院分区:
生物学1区
文献类型:
--
作者:
Naineni SK;Liang J;Hull K;Cencic R;Zhu M;Northcote P;Teesdale-Spittle P;Romo D;Nagar B;Pelletier J

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界面抑制剂是通过与两个大分子相互作用而发挥其生物学效应的。Pateamine A(PatA)类分子通过将真核起始因子(eIF)4A RNA解旋酶稳定到RNA上而发挥功能,导致翻译起始抑制。在这里,我们提出了第一个晶体结构的eIF 4A 1:RNA复合物绑定到一个类似物的海洋海绵衍生的天然产物PatA,C5-去甲基帕特胺A(DMPatA)。这种小分子的一端楔入两个RNA碱基之间,而另一端则由几个蛋白质残基支撑。引人注目的是,DMPatA与eIF 4A 1:RNA复合物的相互作用方式与罗格列胺A(RocA)几乎相同,尽管从结构角度来看完全无关。与RocA相比,结构数据合理化了PatA类似物靶向更广泛的RNA底物的能力。我们定义了DMPatA如何能够将eIF 4A 1夹在RNA上的分子基础,从而赋予该分子有效的抑制特性。
Interfacial inhibitors exert their biological effects through co-association with two macromolecules. The pateamine A (PatA) class of molecules function by stabilizing eukaryotic initiation factor (eIF) 4A RNA helicase onto RNA, resulting in translation initiation inhibition. Here, we present the first crystal structure of an eIF4A1:RNA complex bound to an analogue of the marine sponge-derived natural product PatA, C5-desmethyl pateamine A (DMPatA). One end of this small molecule wedges itself between two RNA bases while the other end is cradled by several protein residues. Strikingly, DMPatA interacts with the eIF4A1:RNA complex in an almost identical fashion as rocaglamide A (RocA), despite being completely unrelated from a structural standpoint. The structural data rationalizes the ability of PatA analogues to target a wider range of RNA substrates compared to RocA. We define the molecular basis of how DMPatA is able to clamp eIF4A1 onto RNA, imparting potent inhibitory properties to this molecule.
DOI: 10.1006/meth.1996.0431
发表时间: 1997-04-01
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