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Related Experiment Video

Updated: Jan 19, 2026

Bacterial Detection & Identification Using Electrochemical Sensors
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Hybrid Two-Component Sensors for Identification of Bacterial Chemoreceptor Function.

Rita A Luu1, Rebecca A Schomer1, Ceanne N Brunton1

  • 1Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California, Davis, Davis, California, USA.

Applied and Environmental Microbiology
|September 8, 2019
PubMed
Summary

Researchers created hybrid sensor proteins to identify chemicals that soil bacteria detect. This method rapidly screens for chemoeffectors, aiding studies in biodegradation and microbial interactions.

Keywords:
Pseudomonas putidabiosensormethyl-accepting chemotaxis proteinreceptortwo-component system

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Soil bacteria utilize complex sensory systems to adapt to environmental changes.
  • Two-component systems and chemotaxis pathways are crucial for bacterial signal transduction and environmental response.
  • Identifying the specific ligands (chemoeffectors) for bacterial chemoreceptors remains a significant challenge.

Purpose of the Study:

  • To develop a simplified method for identifying chemoeffectors sensed by bacterial chemoreceptors.
  • To construct and validate hybrid sensor proteins for detecting specific chemical attractants.
  • To enable rapid and sensitive screening of potential chemoeffectors for bacterial chemoreceptors.

Main Methods:

  • Constructed hybrid sensor proteins by fusing sensor domains of *Pseudomonas putida* chemoreceptors with *Escherichia coli* nitrate sensor signaling domains.
  • Utilized a *E. coli* reporter strain with a nitrate-responsive promoter fused to *lacZ* to monitor responses via β-galactosidase assays.
  • Performed chemotaxis assays in the native *P. putida* strain to validate findings from the reporter system.

Main Results:

  • Hybrid receptors derived from PcaY, McfR, and NahY specifically detected known attractants for aromatic acids, TCA cycle intermediates, and naphthalene.
  • β-galactosidase activities in the *E. coli* reporter system correlated well with chemotaxis assay results.
  • Identified six novel receptors that detect propionate, expanding the known ligand repertoire for bacterial chemoreceptors.

Conclusions:

  • Hybrid sensor proteins coupled with an *E. coli* reporter system provide a rapid, sensitive, and effective method for identifying bacterial chemoeffectors.
  • This approach facilitates functional characterization of numerous uncharacterized chemoreceptors in bacterial genomes.
  • The developed system holds potential for creating sensitive biosensors for diverse environmental applications, including biodegradation and host-microbe interactions.