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Título: | Large-scale movement of eIF3 domains during translation initiation modulate start codon selection |
Autor: | Llácer, José Luis CSIC ORCID ; Hussain, Tanweer; Dong, Jinsheng; Villamayor, Laura CSIC; Gordiyenko, Yuliya; Hinnebusch, Alan G. | Fecha de publicación: | 18-nov-2021 | Editor: | Oxford University Press | Citación: | Nucleic Acids Research 49(20):11491-11511 (2021) | Resumen: | The eukaryotic initiation factor 3 (eIF3) complex is involved in every step of translation initiation, but there is limited understanding of its molecular functions. Here, we present a single particle electron cryomicroscopy (cryo-EM) reconstruction of yeast 48S ribosomal preinitiation complex (PIC) in an open conformation conducive to scanning, with core subunit eIF3b bound on the 40S interface near the decoding center in contact with the ternary complex eIF2·GTP·initiator tRNA. eIF3b is relocated together with eIF3i from their solvent interface locations observed in other PIC structures, with eIF3i lacking 40S contacts. Re-processing of micrographs of our previous 48S PIC in a closed state also suggests relocation of the entire eIF3b-3i-3g-3a-Cter module during the course of initiation. Genetic analysis indicates that high fidelity initiation depends on eIF3b interactions at the 40S subunit interface that promote the closed PIC conformation, or facilitate the relocation of eIF3b/eIF3i to the solvent interface, on start codon selection. | Descripción: | 21 páginas, 7 figuras, 2 tablas. Funding for open access charge: Consejo Superior de Investigaciones Científicas/SpanishNational Research Council | Versión del editor: | https://dx.doi.org/10.1093/nar/gkab908 | URI: | http://hdl.handle.net/10261/255980 | DOI: | 10.1093/nar/gkab908 | ISSN: | 0305-1048 | E-ISSN: | 1362-4962 |
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2021 Nucleic Acids Research 49-11491.pdf | 6,81 MB | Adobe PDF | Visualizar/Abrir |
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