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• W3089102526 endingPage "6974" @default.
• W3089102526 startingPage "6974" @default.
• W3089102526 abstract "Hepatitis C virus (HCV) genome translation is initiated via an internal ribosome entry site (IRES) embedded in the 5′-untranslated region (5′UTR). We have earlier shown that the conserved RNA stem-loops (SL) SL47 and SL87 of the HCV core-encoding region are important for viral genome translation in cell culture and in vivo. Moreover, we have reported that an open reading frame overlapping the core gene in the +1 frame (core+1 ORF) encodes alternative translation products, including a protein initiated at the internal AUG codons 85/87 of this frame (nt 597–599 and 603–605), downstream of SL87, which is designated core+1/Short (core+1/S). Here, we provide evidence for SL47 and SL87 possessing a novel cis-acting element that directs the internal translation initiation of core+1/S. Firstly, using a bicistronic dual luciferase reporter system and RNA-transfection experiments, we found that nucleotides 344–596 of the HCV genotype-1a and -2a genomes support translation initiation at the core+1 frame AUG codons 85/87, when present in the sense but not the opposite orientation. Secondly, site-directed mutagenesis combined with an analysis of ribosome–HCV RNA association elucidated that SL47 and SL87 are essential for this alternative translation mechanism. Finally, experiments using cells transfected with JFH1 replicons or infected with virus-like particles showed that core+1/S expression is independent from the 5′UTR IRES and does not utilize the polyprotein initiation codon, but it requires intact SL47 and SL87 structures. Thus, SL47 and SL87, apart from their role in viral polyprotein translation, are necessary elements for mediating the internal translation initiation of the alternative core+1/S ORF." @default.
• W3089102526 created "2020-10-01" @default.
• W3089102526 creator A5004345445 @default.
• W3089102526 creator A5015740141 @default.
• W3089102526 creator A5022346445 @default.
• W3089102526 creator A5029738443 @default.
• W3089102526 creator A5044505779 @default.
• W3089102526 creator A5059174311 @default.
• W3089102526 creator A5071325857 @default.
• W3089102526 date "2020-09-22" @default.
• W3089102526 modified "2023-10-18" @default.
• W3089102526 title "A Novel Cis-Acting RNA Structural Element Embedded in the Core Coding Region of the Hepatitis C Virus Genome Directs Internal Translation Initiation of the Overlapping Core+1 ORF" @default.
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• W3089102526 doi "https://doi.org/10.3390/ijms21186974" @default.

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