Abstract
Bacterial reporter assays are powerful tools used to study the effect of different compounds that affect the physiology of cellular processes. Most bacterial reporters are luciferase based and can be monitored in real time. In the present study we designed and implemented two sets of Escherichia coli bacterial reporter assays, using a multicopy plasmid system. Each reporter strain was constructed using either green fluorescent protein or β-galactosidase (LacZ) proteins. The designed reporter strains are capable of responding in a specific manner to molecules that either oxidative stress, or membrane, protein, or DNA damage. In order to respond to the desired stimulus, promoter sequences from E. coli were used. These sequences correspond to the promoter of the major catalase (KatG) activated with cellular oxidative damage, the promoter of the β-hydroxydecanoyl-ACP dehydrase (FabA) which is activated with membrane perturbation, the promoter of DNA recombinase (RecA) which is activated by DNA lesions. For protein misfolding, the promoter of the heat-shock responsive chaperon (DnaK) was used. Our constructs displayed activation to damage from specific stimuli, and low response to nonspecific stimuli was detected. Our results suggest that these types of bacterial reporter strains can be used in semiquantitative (fluorometric) and qualitative (β-galactosidase activity) studies of different xenobiotic substances and pollutants.
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Acknowledgments
The authors would like to acknowledge CONACyT (Grant Number CB-2012-01 182671), Promep-SEP (Grant Number F-PROMEP-38/Rev-03 SEP-23-005) and University of Guanajuato (Grant Number FO-DAI-05) for financial support. We thank Dr. Elizabeth Rodriguez-Salinas for critically reading the manuscript. We acknowledge Dr. Laura Ongay and Guadalupe Códiz at the Molecular Biology Unit at IFC, UNAM, for plasmid sequencing.
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The authors declare no commercial or financial conflict of interest.
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Communicated by Erko Stackebrandt.
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Padilla-Martínez, F., Carrizosa-Villegas, L.A., Rangel-Serrano, Á. et al. Cell damage detection using Escherichia coli reporter plasmids: fluorescent and colorimetric assays. Arch Microbiol 197, 815–821 (2015). https://doi.org/10.1007/s00203-015-1119-y
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DOI: https://doi.org/10.1007/s00203-015-1119-y