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Matches in SemOpenAlex for { <https://semopenalex.org/work/W2112682017> ?p ?o ?g. }

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• W2112682017 abstract "Enhanced translation of giardiavirus-luciferase chimeric mRNA in Giardia lamblia requires the initial 264-nt viral capsid coding region as a putative internal ribosomal entry site (IRES). Essential structural elements in this site include (1) a downstream box (DB) complementary to the anti-DB at the 3' end of 16S-like rRNA, (2) stem-loops I, II, III, and IVA, and (3) a pentanucleotide 5'-UCUCC-3' immediately downstream from stem loop IVA. A search for the structural role of the pentanucleotide suggested that it may form a pseudoknot with another pentanucleotide 5'-GGAGA-3' in loop II. Alteration of the two pentanucleotides by site-directed mutagenesis resulted in a drastic reduction in translation of the transcript. But the loss was recovered by compensatory changes in the two sequences, suggesting Watson-Crick base pairings between them. Results from in vitro enzymatic and chemical structural probing supported the presence of such a pseudoknot 143 nt downstream from the initiation codon. Minor repositioning of this codon led invariably to a complete loss of translation, suggesting that the initiation site is confined within a rigid position defined by all the structural elements in the IRES including the pseudoknot. This is the first pseudoknot of its kind shown to play an important role in a downstream IRES of a viral transcript. The finding is particularly interesting because it could reflect a unique feature of translation initiation in Giardia, which is known to have exceedingly short (1-6 nt) 5' untranslated regions in its mRNAs." @default.
• W2112682017 created "2016-06-24" @default.
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• W2112682017 date "2002-05-01" @default.
• W2112682017 modified "2023-10-16" @default.
• W2112682017 title "Identification of an essential pseudoknot in the putative downstream internal ribosome entry site in giardiavirus transcript" @default.
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• W2112682017 doi "https://doi.org/10.1017/s135583820202071x" @default.
• W2112682017 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1370281" @default.
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