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-Structure paper
タイトル | The structure of a human translation initiation complex reveals two independent roles for the helicase eIF4A. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 31, Issue 3, Page 455-464, Year 2024 |
掲載日 | 2024年1月29日 |
著者 | Jailson Brito Querido / Masaaki Sokabe / Irene Díaz-López / Yuliya Gordiyenko / Christopher S Fraser / V Ramakrishnan / |
PubMed 要旨 | Eukaryotic translation initiation involves recruitment of the 43S pre-initiation complex to the 5' end of mRNA by the cap-binding complex eIF4F, forming the 48S translation initiation complex (48S), ...Eukaryotic translation initiation involves recruitment of the 43S pre-initiation complex to the 5' end of mRNA by the cap-binding complex eIF4F, forming the 48S translation initiation complex (48S), which then scans along the mRNA until the start codon is recognized. We have previously shown that eIF4F binds near the mRNA exit channel of the 43S, leaving open the question of how mRNA secondary structure is removed as it enters the mRNA channel on the other side of the 40S subunit. Here we report the structure of a human 48S that shows that, in addition to the eIF4A that is part of eIF4F, there is a second eIF4A helicase bound at the mRNA entry site, which could unwind RNA secondary structures as they enter the 48S. The structure also reveals conserved interactions between eIF4F and the 43S, probaby explaining how eIF4F can promote mRNA recruitment in all eukaryotes. |
リンク | Nat Struct Mol Biol / PubMed:38287194 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.5 Å |
構造データ | EMDB-17297, PDB-8oz0: |
化合物 | ChemComp-ZN: ChemComp-MG: |
由来 |
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キーワード | TRANSLATION / eIF4A / eIF4F / initiation / ribosome / mRNA |