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- W2068442662 abstract "We have used site-directed mutagenesis to determine whether the structural context surrounding the AUG triplet influences its ability to be selected as an initiation codon by the eukaryotic preinitiation complex. AUG triplets were introduced in a loop and stem structure naturally occurring at the midpoint of the 129-nucleotides-long 5'-untranslated region of the porcine proopiomelanocortin mRNA; one AUG triplet was inserted in the loop while another was inserted in the stem of the hairpin structure. The proopiomelanocortin cDNA and the mutant cDNAs were inserted downstream from the early promoter of an expression vector derived from simian virus 40 (SV40) and transfected into monkey kidney COS-1 cells. Analysis of the proopiomelanocortin-related peptides present in the culture medium 72 h after transfection revealed that both mutant cDNAs direct the synthesis of more proopiomelanocortin than the non-mutant cDNA. The increased translational efficiency observed with both mutants is probably due to the decreased secondary structures of the shortened 5'-untranslated region. In addition, comparison of the two mutants indicates that the mutant mRNA with the AUG triplet inserted in the loop region of the hairpin structure directs the synthesis of approximately 75% more proopiomelanocortin than the mutant mRNA with the AUG triplet inserted in the stem region of the same hairpin structure, supporting a role for the structural context in the efficiency of translational initiation." @default.
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- W2068442662 date "1990-08-01" @default.
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- W2068442662 title "Effect of mRNA secondary structure on the efficiency of translational initiation by eukaryotic ribosomes" @default.
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- W2068442662 doi "https://doi.org/10.1111/j.1432-1033.1990.tb19170.x" @default.
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