1. Functional mimicry revealed by the crystal structure of an eIF4A:RNA complex bound to the interfacial inhibitor, desmethyl pateamine A.
- Author
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Naineni SK, Liang J, Hull K, Cencic R, Zhu M, Northcote P, Teesdale-Spittle P, Romo D, Nagar B, and Pelletier J
- Subjects
- Cell Line, Crystallography, X-Ray, Humans, Models, Molecular, Molecular Conformation, Epoxy Compounds chemistry, Eukaryotic Initiation Factor-4A chemistry, Macrolides chemistry, RNA chemistry, Thiazoles chemistry
- Abstract
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 crystal structure of an eIF4A1:RNA complex bound to an analog of the marine sponge-derived natural product PatA, C5-desmethyl PatA (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 rationalize the ability of PatA analogs 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., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2020 Elsevier Ltd. All rights reserved.)
- Published
- 2021
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