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Eukaryotic translation initiation factor 3 plays distinct roles at the mRNA entry and exit channels of the ribosomal preinitiation complex

机译:真核翻译起始因子3在核糖体预启动复合体的mRNA进入和退出通道中起着不同的作用

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摘要

Eukaryotic translation initiation factor 3 (eIF3) is a central player in recruitment of the pre-initiation complex (PIC) to mRNA. We probed the effects on mRNA recruitment of a library of S. cerevisiae eIF3 functional variants spanning its 5 essential subunits using an in vitro-reconstituted system. Mutations throughout eIF3 disrupt its interaction with the PIC and diminish its ability to accelerate recruitment to a native yeast mRNA. Alterations to the eIF3a CTD and eIF3b/i/g significantly slow mRNA recruitment, and mutations within eIF3b/i/g destabilize eIF2•GTP•Met-tRNAi binding to the PIC. Using model mRNAs lacking contacts with the 40S entry or exit channels, we uncovered a critical role for eIF3 requiring the eIF3a NTD, in stabilizing mRNA interactions at the exit channel, and an ancillary role at the entry channel requiring residues of the eIF3a CTD. These functions are redundant: defects at each channel can be rescued by filling the other channel with mRNA.>DOI:
机译:真核翻译起始因子3(eIF3)是将启动前复合物(PIC)募集到mRNA的重要角色。我们使用体外重组系统,探讨了啤酒酵母eIF3功能变体库跨越其5个必需亚基对mRNA募集的影响。整个eIF3的突变会破坏其与PIC的相互作用,并削弱其加速招募至天然酵母mRNA的能力。 eIF3a CTD和eIF3b / i / g的改变显着减慢了mRNA募集,eIF3b / i / g内的突变使eIF2•GTP•Met-tRNAi与PIC的结合不稳定。使用与40S进入或退出通道缺乏接触的模型mRNA,我们发现了需要eIF3a NTD的eIF3在稳定出口通道上的mRNA相互作用中以及在进入通道中需要eIF3a CTD残基的辅助作用中发挥了关键作用。这些功能是多余的:可以通过在另一个通道中填充mRNA来挽救每个通道上的缺陷。> DOI:

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