{"doi":"10.1101/gad.282418.116","title":"Toward the mechanism of eIF4F-mediated ribosomal attachment to mammalian capped mRNAs","abstract":"Ribosomal attachment to mammalian capped mRNAs is achieved through the cap–eukaryotic initiation factor 4E (eIF4E)–eIF4G–eIF3–40S chain of interactions, but the mechanism by which mRNA enters the mRNA-binding channel of the 40S subunit remains unknown. To investigate this process, we recapitulated initiation on capped mRNAs in vitro using a reconstituted translation system. Formation of initiation complexes at 5′-terminal AUGs was stimulated by the eIF4E–cap interaction and followed “the first AUG” rule, indicating that it did not occur by backward scanning. Initiation complexes formed even at the very 5′ end of mRNA, implying that Met-tRNAiMet inspects mRNA from the first nucleotide and that initiation does not have a “blind spot.” In assembled initiation complexes, the cap was no longer associated with eIF4E. Omission of eIF4A or disruption of eIF4E–eIF4G–eIF3 interactions converted eIF4E into a specific inhibitor of initiation on capped mRNAs. Taken together, these results are consistent with the model in which eIF4E–eIF4G–eIF3–40S interactions place eIF4E at the leading edge of the 40S subunit, and mRNA is threaded into the mRNA-binding channel such that Met-tRNAiMet can inspect it from the first nucleotide. Before entering, eIF4E likely dissociates from the cap to overcome steric hindrance. We also found that the m7G cap specifically interacts with eIF3l.","journal":"Genes & Development","year":2016,"id":22272,"datarank":4.702371876081314,"base_score":4.990432586778736,"endowment":4.990432586778736,"self_citation_contribution":0.7485648880168105,"citation_network_contribution":3.9538069880645033,"self_endowment_contribution":0.7485648880168105,"citer_contribution":3.9538069880645033,"corpus_percentile":null,"corpus_rank":null,"citation_count":146,"citer_count":142,"citers_with_citation_signal":114,"citers_with_endowment":114,"datacite_reuse_total":6,"is_dataset":false,"is_dataset_confidence":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":136910,"name":"Christopher U.T. Hellen","orcid":null,"position":1,"is_corresponding":false},{"id":136906,"name":"Tatyana V. Pestova","orcid":null,"position":2,"is_corresponding":false},{"id":140585,"name":"Parimal Kumar","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"base_score":4.990432586778736,"endowment":4.990432586778736,"datacite_reuse_total":6,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"27401559","pmcid":"PMC4949329","openalex_id":"https://openalex.org/W2468892893","authors":[],"funders":[{"funder_name":"National Institutes of Health","grant_id":"GM59660","title":null},{"funder_name":"NIGMS NIH HHS","grant_id":"R01 GM059660","title":null},{"funder_name":"National Institutes of Health","grant_id":"5R01GM059660-03","title":"SCANNING PROCESS IN EUKARYOTIC TRANSLATION"}],"total_grants":3,"fwci":null,"citation_percentile":null,"influential_citations":12,"citation_trend":[{"year":2016,"count":2},{"year":2017,"count":10},{"year":2018,"count":21},{"year":2019,"count":15},{"year":2020,"count":12},{"year":2021,"count":15},{"year":2022,"count":8},{"year":2023,"count":19},{"year":2024,"count":20},{"year":2025,"count":17},{"year":2026,"count":7}],"oa_status":"gold","license":"cc-by-nc","oa_locations":[{"url":"http://genesdev.cshlp.org/content/30/13/1573.full.pdf","host_type":"journal"},{"url":"http://genesdev.cshlp.org/content/30/13/1573.full.pdf","host_type":"GOLD"},{"url":"http://genesdev.cshlp.org/content/30/13/1573.full.pdf","host_type":"publisher"},{"url":"https://syndication.highwire.org/content/doi/10.1101/gad.282418.116","host_type":"publisher"},{"url":"https://doi.org/10.1101/gad.282418.116","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/27401559","host_type":"repository"},{"url":"http://genesdev.cshlp.org/cgi/content/short/30/13/1573","host_type":"repository"},{"url":"https://www.ncbi.nlm.nih.gov/pmc/articles/4949329","host_type":"repository"},{"url":"https://europepmc.org/articles/PMC4949329","host_type":"Europe_PMC"},{"url":"https://europepmc.org/articles/PMC4949329?pdf=render","host_type":"Europe_PMC"},{"url":"http://dx.doi.org/10.1101/gad.282418.116","host_type":""},{"url":"https://dx.doi.org/10.1101/gad.282418.116","host_type":""}],"fields_of_study":["RNA and protein synthesis mechanisms","RNA Research and Splicing","RNA modifications and cancer","Biology","Medicine","0301 basic medicine","0303 health sciences","03 medical and health sciences","Animals","Eukaryotic Initiation Factor-4F","Mammals","Mutation","RNA Caps","RNA, Messenger","RNA, Transfer","Recombinant Proteins","Ribosome Subunits, Small, Eukaryotic","Ribosomes"],"mesh_terms":["Animals","Mammals","Mutation","Recombinant Proteins","Ribosomes","RNA Caps","RNA, Messenger","RNA, Transfer","Eukaryotic Initiation Factor-4F","Ribosome Subunits, Small, Eukaryotic"],"keywords":["EIF4G","EIF4E","Eukaryotic Small Ribosomal Subunit","Biology","Initiation factor","Eukaryotic initiation factor","eIF4A","Eukaryotic translation","Messenger RNA","Cell biology","Protein subunit","Translation (biology)","EIF4A1","Molecular biology","Biochemistry","Gene","Eif4f","Eukaryotic Translation Initiation","40S Ribosomal Subunit","Eif3l","M7g","Mammals","RNA Caps","Ribosome Subunits, Small, 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