Targeting 16S ribosomal DNA for stable recombinant gene expression in Pseudomonas.

08:00 EDT 12th July 2019 | BioPortfolio

Summary of "Targeting 16S ribosomal DNA for stable recombinant gene expression in Pseudomonas."

Ribosomal RNA (rRNA) operons have recently been identified as promising site for chromosomal integration of genetic elements in Pseudomonas putida, a bacterium that has gained considerable popularity as microbial cell factory. We have developed a tool for targeted integration of recombinant genes into the rRNA operons of various Pseudomonas strains, where the native context of the rRNA clusters enables effective transcription of heterologous genes. However, a sufficient translation of foreign messenger RNA (mRNA) transcriptionally fused to rRNA required optimization of RNA secondary structures, which was achieved utilizing synthetic ribozymes and a bicistronic design. The generated tool further enabled the characterization of the six rRNA promoter units of P. putida S12 under different growth conditions. The presence of multiple, almost identical rRNA operons in Pseudomonas also allowed the integration of multiple copies of heterologous genetic elements. The integration of two expression cassettes and the resulting disruption of rRNA units only moderately affects growth rates and the constructs were highly stable over more than 160 generations.


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This article was published in the following journal.

Name: ACS synthetic biology
ISSN: 2161-5063


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Medical and Biotech [MESH] Definitions

The in vitro fusion of GENES by RECOMBINANT DNA techniques to analyze protein behavior or GENE EXPRESSION REGULATION, or to merge protein functions for specific medical or industrial uses.

The integration of exogenous DNA into the genome of an organism at sites where its expression can be suitably controlled. This integration occurs as a result of homologous recombination.

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The effects on gene expression that depend on the location of a gene with respect to its neighboring genes and region of chromosome. Stable position effects are sequence dependent. Variegated position effects depend on whether the gene is located in or adjacent to HETEROCHROMATIN or EUCHROMATIN.

The GENETIC RECOMBINATION of the parts of two or more GENES resulting in a gene with different or additional regulatory regions, or a new chimeric gene product. ONCOGENE FUSION includes an ONCOGENE as at least one of the fusion partners and such gene fusions are often detected in neoplastic cells and are transcribed into ONCOGENE FUSION PROTEINS. ARTIFICIAL GENE FUSION is carried out in vitro by RECOMBINANT DNA technology.

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