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Strength of translation initiation signal sequence of mRNA as studied by quantification method: effect of nucleotide substitutions upon translation efficiency in rat preproinsulin mRNA



Strength of translation initiation signal sequence of mRNA as studied by quantification method: effect of nucleotide substitutions upon translation efficiency in rat preproinsulin mRNA



Nucleic Acids Research 24(17): 3313-3316



Concerning the translation initiation signals in vertebrate mRNAs, both the ATG initiation codon and the sequences flanking the initiation codon are required to direct the position of initiation. A consensus sequence for the signal, (GCC)GCC(A or G)CCATGG, has been proposed, but actual initiation sequences differ from it to a greater or lesser degree. In the present report, the translation initiation signal sequences of rat prepro-insulin and its mutant mRNAs were analyzed using a quantification method proposed previously. In this method, each 16 nt sequence in the mRNA was characterized by its sample score, which shows strength of the signal. So far, Kozak has constructed a number of preproinsulin mutant mRNAs in which nucleotides flanking the ATG codon are systematically varied, and measured the translation initiation efficiency in terms of the proinsulin product. Her experimental results were well understood on the basis of the strength of the translation initiation signal sequence.

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Accession: 009461623

Download citation: RISBibTeXText

PMID: 8811083

DOI: 10.1093/nar/24.17.3313


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