Vectors for regulated gene expression in the radioresistant bacterium Deinococcus radiodurans

Deinococcus radiodurans possesses an exceptional capacity to withstand the lethal and mutagenic effects of most form of DNA damage and has received considerable interest for use in both fundamental and applied research. Here we describe vectors that allow regulated expression of Deinococcal genes fo...

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Bibliographic Details
Published in:Gene 2004-07, Vol.336 (1), p.25-35
Main Authors: Lecointe, François, Coste, Geneviève, Sommer, Suzanne, Bailone, Adriana
Format: Article
Language:English
Subjects:
Bacillus subtilis
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
beta-Galactosidase - metabolism
Conditional gene inactivation
Deinococcus - drug effects
Deinococcus - genetics
Deinococcus - growth & development
Deinococcus radiodurans
DNA Gyrase - genetics
DNA repair
Gene Expression Regulation, Bacterial
Genes, Essential - genetics
Genetic Vectors - genetics
Isopropyl Thiogalactoside - pharmacology
Lac Operon - genetics
Life Sciences
Mutation
Plasmids - genetics
Promoter Regions, Genetic - genetics
Rec A Recombinases - genetics
RecA protein
Regulatable promoters
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Summary:Deinococcus radiodurans possesses an exceptional capacity to withstand the lethal and mutagenic effects of most form of DNA damage and has received considerable interest for use in both fundamental and applied research. Here we describe vectors that allow regulated expression of Deinococcal genes for functional analysis. The vectors contain the IPTG-regulated Spac system (P spac promoter and lacI repressor gene), originally designed for Bacillus subtilis, that we have adapted to be functional in D. radiodurans. We show that the Spac system can control the expression of a lacZ reporter gene over two orders of magnitude depending on the inducer concentration and the copy number of the lacI regulatory gene. Furthermore, we demonstrate that the Spac system can be used to regulate the synthesis of a critical repair protein, such as RecA, resulting in a conditional mitomycin-resistant cell phenotype. We have also developed tools for the construction of conditional mutants where the expression of the target gene is regulated by an inducible promoter. The utility of these conditional gene inactivation systems is exemplified by the conditional lethal phenotype of a mutant expressing gyrA from the P spac promoter.
ISSN:0378-1119
1879-0038
DOI:10.1016/j.gene.2004.04.006