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. 1986 Jul 11;14(13):5481–5497. doi: 10.1093/nar/14.13.5481

Secondary structure as primary determinant of the efficiency of ribosomal binding sites in Escherichia coli.

A C Looman, J Bodlaender, M de Gruyter, A Vogelaar, P H van Knippenberg
PMCID: PMC311554  PMID: 3526283

Abstract

Using a previously described vector (pKL203) we fused several heterologous ribosomal binding sites (RBSs) to the lacZ gene of E. coli and then studied the variation in expression of the fusions. The RBSs originated from bacteriophage Q beta and MS2 genes and the E. coli genes for elongation factor EF-Tu A and B and ribosomal protein L11 (rplK). The synthesis of the lacZ fusion proteins was measured by an immuno precipitation method and found to vary at least 100-fold. Lac-specific mRNA synthesis follows the variation in protein production. It appears that there is a correlation between the efficiency of an RBS to function in the expression of the fused gene and the lack of secondary structure, involving the Shine and Dalgarno nucleotides (SDnts) and/or the initiation codon. This efficiency is context dependent. The sequence of the SD nts and the length and sequence of the spacer region up to the initiation codon alone are not able to explain our results. Deletion mutations, created in the phage Q beta replicase RBS, reveal a complex pattern of control of expression, probably involving the use of a "false" initiation site.

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Selected References

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