Distance-dependent translational coupling and interference in Lactococcus lactis - PubMed (original) (raw)
Distance-dependent translational coupling and interference in Lactococcus lactis
M van de Guchte et al. Mol Gen Genet. 1991 May.
Free article
Abstract
The possibility of raising the expression level of a heterologous gene in Lactococcus lactis by exploiting the principle of translational coupling was investigated. For this purpose, the Escherichia coli lacZ gene was transcriptionally fused to a short open reading frame (ORF) of lactococcal origin. A Shine-Dalgarno (SD) sequence was introduced at the boundary of the two ORFs. In a series of otherwise identical plasmids, the relative positions of the translational stop codon of the upstream ORF and the translational start codon of the downstream ORF (lacZ) were varied. The expression of lacZ gradually increased as the stop and start codons were placed in closer proximity. A concomitant switch from translational interference to translational coupling was observed. Best results were obtained with partially overlapping stop and start codons. It is concluded that the principle of translational coupling offers good possibilities to increase the level of heterologous gene expression in L. lactis.
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