The cap-binding translation initiation factor, eIF4E, binds a pseudoknot in a viral cap-independent translation element.
The cap-binding translation initiation factor, eIF4E, binds a pseudoknot in a viral cap-independent translation element.
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DOI:
10.1016/j.str.2011.03.013
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发表时间:
2011-06-08
期刊:
影响因子:
5.7
通讯作者:
Miller, W. Allen
中科院分区:
文献类型:
--
作者:
Wang, Zhaohui;Parisien, Marc;Scheets, Kay;Miller, W. Allen
Eukaryotic initiation factor eIF4E performs a key early step in translation by specifically recognizing the m7GpppN cap structure at the 5' end of cellular mRNAs. Many viral mRNAs lack a 5' cap and thus bypass eIF4E. In contrast, we reported a novel cap-independent translation element (PTE) in Pea enation mosaic virus RNA2 that binds and requires eIF4E for translation initiation. To understand how this uncapped RNA is bound tightly by eIF4E we employ SHAPE probing, phylogenetic comparisons with new PTEs discovered in panico- and carmoviruses, footprinting of the eIF4E binding site, and 3D RNA modeling using NAST, MC-Fold, and MC-Sym to predict a compact, three-dimensional structure of the RNA. We propose that the cap-binding pocket of eIF4E clamps around a pseudoknot, placing a highly SHAPE-reactive guanosine in the pocket in place of the normal m7GpppN cap. This reveals a new mechanism of mRNA recognition by eIF4E.
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