Abstract
We wanted to discover whether the conformation of the mRNA leader sequence is involved in translational fidelity. For this purpose we constructed several mutants of Semliki Forest virus 26S mRNA and inserted AUG codons into the leader sequence. We then analyzed the results of in vitro and in vivo translation of these mRNAs, probed enzymatically the secondary structure and performed minimal energy folding of the transcripts. Our results indicate that the position of a hairpin in the leader sequence determines at which AUG codon downstream from that hairpin translation is initiated.
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