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A set of synthetic versatile genetic control elements for the efficient expression of genes in Actinobacteria
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A set of synthetic versatile genetic control elements for the efficient expression of genes in Actinobacteria
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Journal Article
A set of synthetic versatile genetic control elements for the efficient expression of genes in Actinobacteria
2018
Overview
The design and engineering of secondary metabolite gene clusters that are characterized by complicated genetic organization, require the development of collections of well-characterized genetic control elements that can be reused reliably. Although a few intrinsic terminators and RBSs are used routinely, their translation and termination efficiencies have not been systematically studied in Actinobacteria. Here, we analyzed the influence of the regions surrounding RBSs on gene expression in these bacteria. We demonstrated that inappropriate RBSs can reduce the expression efficiency of a gene to zero. We developed a genetic device – an
in vivo
RBS-selector – that allows selection of an optimal RBS for any gene of interest, enabling rational control of the protein expression level. In addition, a genetic tool that provides the opportunity for measurement of termination efficiency was developed. Using this tool, we found strong terminators that lead to a 17–100-fold reduction in downstream expression and are characterized by sufficient sequence diversity to reduce homologous recombination when used with other elements. For the first time, a C-terminal degradation tag was employed for the control of protein stability in
Streptomyces
. Finally, we describe a collection of regulatory elements that can be used to control metabolic pathways in Actinobacteria.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
