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• W2014651657 abstract "The lengthy 5' untranslated region (5'UTR) of coxsackievirus B3 (CVB3) forms a highly ordered secondary structure, which plays an important role in controlling viral transcription and translation. Our previous work has delineated the internal ribosome entry site (IRES) by mutation of mono- and bicistronic plasmids containing the 5'UTR and subsequent cell- free translation in rabbit reticular lysate (D. Yang, J. E. Wilson, D. R. Anderson, L. Bohunek, C. Cordeiro, R. Kandolf, and B. M. McManus. (1997). Virology 228, 63-73). To further identify the sequence elements responsible for viral translation and infectivity in tissue culture cells, >30 full-length mutants of CVB3 were constructed by mutations of the IRES and its flanking regions. Viral RNAs were transcribed from these constructs and transfected into HeLa cells. When the stem-loops G and H in the putative IRES were deleted, viral infectivity was abolished and viral protein translation was also undetectable by immunoblot analysis. However, when stem-loops A and B were deleted or stem-loop E was partially deleted, viral protein translation could be detected although cytopathic effect could not be observed. The data suggest that the crucial sequence of the IRES is located at stem-loops G and H. Further serial deletion mapping up and down stream of the crucial sequence defined more accurately the 5' and 3' boundaries of the IRES, located at nucleotides (nts) 309-432 and 639-670, respectively. These results indicate that the core sequence of the IRES should be located at nts 432-639. This IRES segment is much shorter and located closer to the initiation codon than that of poliovirus. To further define critical nucleotides within the IRES core, site-directed mutagenesis was conducted at the IRES core sequence by PCR. A 46-nt deletion in the pyrimidine-rich tract of stem-loop G abolished viral translation and infectivity. Interestingly, five single-nt substitutions in the pyrimidine-rich tract aimed at destabilizing the base pairing between the viral IRES and host 18S rRNA did not abolish CVB3 infectivity although viral protein translation was significantly reduced. This finding suggests that ribosomal internal initiation of translation and viral infectivity not only may require RNA secondary structure but also may need tertiary structure and perhaps the assistance of host protein factors." @default.
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• W2014651657 date "1999-12-01" @default.
• W2014651657 modified "2023-09-25" @default.
• W2014651657 title "Structural and Functional Analysis of the 5′ Untranslated Region of Coxsackievirus B3 RNA: In Vivo Translational and Infectivity Studies of Full-Length Mutants" @default.
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• W2014651657 doi "https://doi.org/10.1006/viro.1999.0048" @default.
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