Abstract
Sendai virus P/C mRNA, human erythrocyte membrane protein 4.1 mRNA and PDGF-B chain mRNA were used to test whether translation initiation from non-AUG codons in COS1 cells was mRNA species dependent. Site-directed mutants of the authentic translation start sites of these mRNAs to alternate start codons showed that while P/C mRNA is capable of initiating translation from non-AUG start sites the other two mRNAs are not. Our study shows that translation initiation from non-AUG codons is mRNA species dependent and suggests that higher order structure of an mRNA determines the non-AUG translation start site.
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