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- W2100025889 abstract "Ornithine decarboxylase (ODC), a key enzyme in polyamine biosynthesis, is a highly inducible protein whose expression involves a complex and variable array of regulatory mechanisms. We investigated the influence of the 5'-untranslated region (5'UTR) of the rat ODC mRNA on translation of the mRNA in a cell-free system and in cultured mammalian cells. ODC mRNA containing the full-length 5'UTR was translated in reticulocyte lysates at approximately 5% of the rate of mRNA containing no ODC 5' leader sequences. The complete 5'UTR inhibited expression of a heterologous gene product, human growth hormone, to the same extent in cultured mammalian cells. Furthermore, the 5'-most 130 bases of the rat ODC 5'UTR, a conserved G/C-rich region predicted to form a stable stem-loop structure (delta G = -68 kcal/mol), repressed translation to the same extent as the entire 5'UTR, both in the lysates and in intact cells. The 3'-most 160 bases of the 5'UTR, containing a small upstream open reading frame, decreased expression by 50-65% both in vitro and in intact cells, compared with controls lacking any ODC 5'UTR sequences. Mutation of the initiation codon AUG beginning this upstream open reading frame to GCG restored expression to rates equivalent to those seen in constructions containing no ODC 5'UTR sequences. We conclude that the rat ODC mRNA 5'UTR can inhibit translation of ODC mRNA both in vitro and in vivo, and that the predicted stem-loop structure at the 5' end of the 5'UTR is both necessary and sufficient for this inhibition." @default.
- W2100025889 created "2016-06-24" @default.
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- W2100025889 date "1990-07-01" @default.
- W2100025889 modified "2023-10-16" @default.
- W2100025889 title "Regulation of rat ornithine decarboxylase mRNA translation by its 5'-untranslated region." @default.
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- W2100025889 doi "https://doi.org/10.1016/s0021-9258(19)38471-6" @default.
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