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TitleeIF5B and eIF1A reorient initiator tRNA to allow ribosomal subunit joining.
Journal, issue, pagesNature, Vol. 607, Issue 7917, Page 185-190, Year 2022
Publish dateJun 22, 2022
AuthorsChristopher 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 AbstractTranslation 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 linksNature / PubMed:35732735 / PubMed Central
MethodsEM (single particle)
Resolution3.2 Å
Structure data

26067

7tql

EMDB-26067, PDB-7tql:
CryoEM structure of the human 40S small ribosomal subunit in complex with translation initiation factors eIF1A and eIF5B.
Method: EM (single particle) / Resolution: 3.2 Å

Chemicals

ChemComp-GNP:
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER / GppNHp, GMPPNP, energy-carrying molecule analogue*YM

ChemComp-5GP:
GUANOSINE-5'-MONOPHOSPHATE

ChemComp-ZN:
Unknown entry

Source
  • homo sapiens (human)
KeywordsRIBOSOME / eIF5B / translation / initiation / eIF1A

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