+Search query
-Structure paper
Title | eIF5B and eIF1A reorient initiator tRNA to allow ribosomal subunit joining. |
---|---|
Journal, issue, pages | Nature, Vol. 607, Issue 7917, Page 185-190, Year 2022 |
Publish date | Jun 22, 2022 |
Authors | 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 Abstract | 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. |
External links | Nature / PubMed:35732735 / PubMed Central |
Methods | EM (single particle) |
Resolution | 3.2 Å |
Structure data | EMDB-26067, PDB-7tql: |
Chemicals | ChemComp-GNP: ChemComp-5GP: ChemComp-ZN: |
Source |
|
Keywords | RIBOSOME / eIF5B / translation / initiation / eIF1A |