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. 1988 Aug;85(15):5439–5443. doi: 10.1073/pnas.85.15.5439

Translation initiation controls the relative rates of expression of the bacteriophage lambda late genes.

L L Sampson 1, R W Hendrix 1, W M Huang 1, S R Casjens 1
PMCID: PMC281772  PMID: 2969591

Abstract

The late operon of bacteriophage lambda contains the genes encoding the morphogenetic proteins of the phage. These genes are transcribed equally from the single late promoter. Although the functional half-lives of the mRNA for the various genes of this operon vary less than 2-fold, their relative rates of expression have been shown to vary by nearly 1000-fold. This variation could result from differing rates of translation initiation, from overlapping upstream translation, or from differential elongation rates due to the presence of codons for which the corresponding tRNAs are rare. To distinguish between these possibilities, we have cloned sequences surrounding the initiator codons of several of these genes and measured their ability to drive synthesis of hybrid lambda-beta-galactosidase proteins. The rates of expression of the hybrid genes thus produced correlate very well with the natural rates of expression of the corresponding phage genes, suggesting that the rate of initiation of translation controls the relative expression rates of these genes.

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Selected References

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