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-Structure paper
| タイトル | eIF5B and eIF1A reorient initiator tRNA to allow ribosomal subunit joining. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 607, Issue 7917, Page 185-190, Year 2022 |
| 掲載日 | 2022年6月22日 |
著者 | Christopher P Lapointe / Rosslyn Grosely / Masaaki Sokabe / Carlos Alvarado / Jinfan Wang / Elizabeth Montabana / Nancy Villa / Byung-Sik Shin / Thomas E Dever / Christopher S Fraser / Israel S Fernández / Joseph D Puglisi / ![]() |
| PubMed 要旨 | Translation initiation defines the identity and quantity of a synthesized protein. The process is dysregulated in many human diseases. A key commitment step is when the ribosomal subunits join at a ...Translation initiation defines the identity and quantity of a synthesized protein. The process is dysregulated in many human diseases. A key commitment step is when the ribosomal subunits join at a translation start site on a messenger RNA to form a functional ribosome. Here, we combined single-molecule spectroscopy and structural methods using an in vitro reconstituted system to examine how the human ribosomal subunits join. Single-molecule fluorescence revealed when the universally conserved eukaryotic initiation factors eIF1A and eIF5B associate with and depart from initiation complexes. Guided by single-molecule dynamics, we visualized initiation complexes that contained both eIF1A and eIF5B using single-particle cryo-electron microscopy. The resulting structure revealed how eukaryote-specific contacts between the two proteins remodel the initiation complex to orient the initiator aminoacyl-tRNA in a conformation compatible with ribosomal subunit joining. Collectively, our findings provide a quantitative and architectural framework for the molecular choreography orchestrated by eIF1A and eIF5B during translation initiation in humans. |
リンク | Nature / PubMed:35732735 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.2 Å |
| 構造データ | EMDB-26067, PDB-7tql: |
| 化合物 | ![]() ChemComp-GNP: ![]() ChemComp-5GP: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | RIBOSOME / eIF5B / translation / initiation / eIF1A |
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