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. 1988 Jul;8(7):2964–2975. doi: 10.1128/mcb.8.7.2964

Mutational analysis of the HIS4 translational initiator region in Saccharomyces cerevisiae.

A M Cigan 1, E K Pabich 1, T F Donahue 1
PMCID: PMC363516  PMID: 3043201

Abstract

We have mutated various features of the 5' noncoding region of the HIS4 mRNA in light of established Saccharomyces cerevisiae and mammalian consensus translational initiator regions. Our analysis indicates that insertion mutations that introduce G + C-rich sequences in the leader, particularly those that result in stable stem-loop structures in the 5' noncoding region of the HIS4 message, severely affect translation initiation. Mutations that alter the length of the HIS4 leader from 115 to 39 nucleotides had no effect on expression, and sequence context changes both 5' and 3' to the HIS4 AUG start codon resulted in no more than a twofold decrease of expression. Changing the normal context at HIS4 5'-AAUAAUGG-3' to the optimal sequence context proposed for mammalian initiator regions 5'-CACCAUGG-3' did not result in stimulation of HIS4 expression. These studies, in conjunction with comparative and genetic studies in S. cerevisiae, support a general mechanism of initiation of protein synthesis as proposed by the ribosomal scanning model.

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Selected References

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