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- W2010689904 abstract "Translation initiation in Hepatitis C Virus is controlled by the presence of an internal ribosome entry site element (IRES) principally located in its 5' untranslated region (UTR). Mutation/deletion analyses have shown that the integrity of this structure is essential for initiation of cap-independent protein synthesis. We have developed a strategy to swap the position of the two major domains (II and III) on the 5'UTR sequence. The aim was to further characterize this mechanism by preserving domain-specific interactions but possibly losing contacts that require any interdomain geometry. The expression of dicistronic mRNAs containing these different UTRs showed that the positioning of the different domains on the 5'UTR is essential for efficient IRES functioning. We then used these mutants to identify cellular factors implicated in IRES activity. Using UV crosslinking assays we found that domain III makes direct contact with two proteins (p170/p120) which can be associated with efficient IRES activity. In particular, we have mapped the binding sites of these proteins and shown that p120 binds to the apical loop segment of domain III, whilst p170 binds in the stem portion, independently of domain III position or context. Finally, we provide evidence showing that p170 and p120 represent two subunits of eukaryotic initiation factor eIF3: p170 and p116/p110." @default.
- W2010689904 created "2016-06-24" @default.
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- W2010689904 date "1998-07-01" @default.
- W2010689904 modified "2023-10-16" @default.
- W2010689904 title "Functional analysis of the interaction between HCV 5'UTR and putative subunits of eukaryotic translation initiation factor eIF3" @default.
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- W2010689904 doi "https://doi.org/10.1093/nar/26.13.3179" @default.
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