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• W2337839941 endingPage "4265" @default.
• W2337839941 startingPage "4252" @default.
• W2337839941 abstract "Abstract During eukaryotic translation initiation, the 43S preinitiation complex (43S PIC), consisting of the 40S ribosomal subunit, eukaryotic initiation factors (eIFs) and initiator tRNA scans mRNA to find an appropriate start codon. Key roles in the accuracy of initiation codon selection belong to eIF1 and eIF1A, whereas the mammalian-specific DHX29 helicase substantially contributes to ribosomal scanning of structured mRNAs. Here, we show that DHX29 stimulates the recognition of the AUG codon but not the near-cognate CUG codon regardless of its nucleotide context during ribosomal scanning. The stimulatory effect depends on the contact between DHX29 and eIF1A. The unique DHX29 N-terminal domain binds to the ribosomal site near the mRNA entrance, where it contacts the eIF1A OB domain. UV crosslinking assays revealed that DHX29 may rearrange eIF1A and eIF2α in key nucleotide context positions of ribosomal complexes. Interestingly, DHX29 impedes the 48S initiation complex formation in the absence of eIF1A perhaps due to forming a physical barrier that prevents the 43S PIC from loading onto mRNA. Mutational analysis allowed us to split the mRNA unwinding and codon selection activities of DHX29. Thus, DHX29 is another example of an initiation factor contributing to start codon selection." @default.
• W2337839941 created "2016-06-24" @default.
• W2337839941 creator A5055690028 @default.
• W2337839941 creator A5058695820 @default.
• W2337839941 date "2016-04-11" @default.
• W2337839941 modified "2023-10-12" @default.
• W2337839941 title "DHX29 reduces leaky scanning through an upstream AUG codon regardless of its nucleotide context" @default.
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• W2337839941 doi "https://doi.org/10.1093/nar/gkw240" @default.
• W2337839941 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4872109" @default.
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• W2337839941 hasPublicationYear "2016" @default.
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