Development of an oxidative stress sensor in live bacteria using the optimized HyPer2 protein View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-02

AUTHORS

B. Franco, Felipe Padilla-Vaca, Naurú Idalia Vargas-Maya, Luz Janeth Herrera-Gutiérrez, Josué Daniel Mora-Garduño, Margarita Daniela Tafoya-Ramírez, Itzel Páramo-Pérez, Fernando Anaya-Velázquez, Claudia Leticia Mendoza-Macías

ABSTRACT

Oxidative stress is a key regulator in many cellular processes but also an important burden for living organisms. The source of oxidative damage usually is difficult to measure and assess with analytical tools or chemical indicators. One major limitation is to discriminate the presence of secondary oxidant molecules derived from the cellular metabolism after exposure to the oxidant or the scavenging capacity of reactive oxygen species by cells. Using a whole-cell reporter system based on an optimized HyPer2 protein for Escherichia coli expression, we demonstrate that, as previously shown for eukaryotic organisms, the effect at the transcriptional level of hydrogen peroxide can be monitored in vivo using flow cytometry of bacterial cells without the need of a direct analytical measurement. In this approach, we generated two different HyPer2 expression systems, one that is induced by IPTG and a second one that is induced by oxidative stress responsive promoters to control the expression of the HyPer2 protein and the exposure of higher H2O2 concentrations that has been shown to activate oxidative response genes. Both systems showed that the pathway that leads to the generation of H2O2 in vivo can be traced from H2O2 exposure. Our results indicate that hydrogen peroxide pulses can be readily detected in E. coli cells by a defined fluorescence signature that is H2O2 concentration-dependent. Our findings indicate that although less sensitive than purified protein or expressed in eukaryotic cells, HyPer2 is a good bacterial sensor for H2O2. As proof of concept, this system was used to trace the oxidative capacity of Toluidine Blue O showing that oxidative stress and redox imbalance is generated inside the cell. This system is expanding the repertoire of whole cell probes available for tracing cellular stress in bacteria. More... »

PAGES

1-11

Journal

TITLE

Antonie van Leeuwenhoek

ISSUE

N/A

VOLUME

N/A

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10482-018-1140-7

DOI

http://dx.doi.org/10.1007/s10482-018-1140-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1106118330

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30099683


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35 schema:description Oxidative stress is a key regulator in many cellular processes but also an important burden for living organisms. The source of oxidative damage usually is difficult to measure and assess with analytical tools or chemical indicators. One major limitation is to discriminate the presence of secondary oxidant molecules derived from the cellular metabolism after exposure to the oxidant or the scavenging capacity of reactive oxygen species by cells. Using a whole-cell reporter system based on an optimized HyPer2 protein for Escherichia coli expression, we demonstrate that, as previously shown for eukaryotic organisms, the effect at the transcriptional level of hydrogen peroxide can be monitored in vivo using flow cytometry of bacterial cells without the need of a direct analytical measurement. In this approach, we generated two different HyPer2 expression systems, one that is induced by IPTG and a second one that is induced by oxidative stress responsive promoters to control the expression of the HyPer2 protein and the exposure of higher H<sub>2</sub>O<sub>2</sub> concentrations that has been shown to activate oxidative response genes. Both systems showed that the pathway that leads to the generation of H<sub>2</sub>O<sub>2</sub> in vivo can be traced from H<sub>2</sub>O<sub>2</sub> exposure. Our results indicate that hydrogen peroxide pulses can be readily detected in E. coli cells by a defined fluorescence signature that is H<sub>2</sub>O<sub>2</sub> concentration-dependent. Our findings indicate that although less sensitive than purified protein or expressed in eukaryotic cells, HyPer2 is a good bacterial sensor for H<sub>2</sub>O<sub>2</sub>. As proof of concept, this system was used to trace the oxidative capacity of Toluidine Blue O showing that oxidative stress and redox imbalance is generated inside the cell. This system is expanding the repertoire of whole cell probes available for tracing cellular stress in bacteria.
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