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. 1993 Sep 11;21(18):4268–4271. doi: 10.1093/nar/21.18.4268

Influence of the three nucleotides upstream of the initiation codon on expression of the Escherichia coli lacZ gene in Saccharomyces cerevisiae.

A C Looman 1, J A Kuivenhoven 1
PMCID: PMC310060  PMID: 8414981

Abstract

By introducing synthetic oligonucleotides into a lacZ-yeast expression vector a set of 47 plasmids (out of 64 possible) was generated, differing only in the three bases immediately upstream of the AUG initiation codon of the Escherichia coli lacZ gene. Expression of the beta-galactosidase fusion protein encoded by the different plasmids was determined in Saccharomyces cerevisiae by immunogel electrophoresis. Among the clones tested we found a factor 3 difference in expression. A slight nucleotide preference was found in positions -3(A > G > C = U) and -2 (G > C = U > A). The choice of the nucleotide at position -1 immediately 5' of the AUG did not effect translation efficiency. Increasing homology to the yeast consensus sequence (AAAAAAAUGUCU) was not concomitant with an increased translation efficiency. Our results indicate that the choice of nucleotides immediately preceding the initiation codon in yeast does not dramatically influence translation efficiency, as in prokaryotes or higher eukaryotes.

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Selected References

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