Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 490020
Title Development of the recombinase-based in vivo expression technology in Streptococcus thermophilus and validation using the lactose operon promoter
Author(s) Junjua, M.; Galia, W.; Gaci, N.; Uriot, O.; Genay, M.; Bachmann, H.; Kleerebezem, M.; Dary, A.; Roussel, Y.
Source Journal of Applied Microbiology 116 (2014)3. - ISSN 1364-5072 - p. 620 - 631.
DOI https://doi.org/10.1111/jam.12376
Department(s) Host-Microbe Interactomics
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) lactic-acid bacteria - gene-expression - lactococcus-lactis - human gut - yogurt - system - mice - identification - transformation - proteinase
Abstract
Aims

To construct and validate the recombinase-based in vivo expression technology (R-IVET) tool in Streptococcus thermophilus (ST).

Methods and Results

The R-IVET system we constructed in the LMD-9 strain includes the plasmid pULNcreB allowing transcriptional fusion with the gene of the site-specific recombinase Cre and the chromosomal cassette containing a spectinomycin resistance gene flanked by two loxP sites. When tested in M17 medium, promoters of the genes encoding the protease PrtS, the heat-shock protein Hsp16 and of the lactose operon triggered deletion of the cassette, indicating promoter activity in these conditions. The lactose operon promoter was also found to be activated during the transit in the murine gastrointestinal tract.

Conclusions

The R-IVET system developed in ST is relatively stable, functional, very sensitive and can be used to assay activity of promoters, which are specifically active in in vivo conditions.

Significance and Impact of the Study

This first adaptation of R-IVET to ST provides a highly valuable tool allowing an exploration of the physiological state of ST in the GIT of mammals, fermentation processes or dairy products.
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