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Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens

Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens

Published on: June 12, 2013

Caulobacter crescentus as a whole-cell uranium biosensor.

Nathan J Hillson¹, Ping Hu, Gary L Andersen

¹Department of Developmental Biology, Beckman Center, Stanford University School of Medicine, Stanford, California 94305, USA.

Applied and Environmental Microbiology

|October 2, 2007

Summary

Researchers engineered a bacterium, Caulobacter crescentus, to detect uranium. This biosensor glows under UV light when uranium is present, enabling rapid field detection of this toxic metal.

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Synchronization of Caulobacter Crescentus for Investigation of the Bacterial Cell Cycle

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Published on: April 8, 2015

Area of Science:

Environmental microbiology
Biosensor development
Biotechnology

Background:

Uranium contamination poses environmental and health risks.
Existing uranium detection methods can be slow, expensive, or require specialized equipment.
Microarray analysis identified specific bacterial genes responding to uranium.

Purpose of the Study:

To engineer a novel biosensor for rapid, on-site uranium detection.
To utilize the urcA gene from Caulobacter crescentus for uranium sensing.
To develop a user-friendly and cost-effective uranium detection system.

Main Methods:

Engineered Caulobacter crescentus with a reporter construct using the urcA promoter.
The reporter expresses UV-excitable green fluorescent protein in response to uranium.
Tested specificity against other heavy metals and nitrates.
Validated the biosensor using contaminated and uncontaminated groundwater samples.

Main Results:

The engineered Caulobacter strain fluoresces in the presence of micromolar uranium levels.
The reporter demonstrated high specificity for uranium, with minimal cross-reactivity.
Successfully discriminated between contaminated (4.2 microM) and uncontaminated (<0.1 microM) groundwater samples.
The biosensor is effective at ambient temperatures and requires only a UV lamp.

Conclusions:

The Caulobacter-based biosensor provides a rapid, specific, and field-deployable method for uranium detection.
This approach offers advantages over traditional methods, including minimal sample processing and on-demand usability.
Potential applications include environmental monitoring of soil, groundwater, and industrial surfaces.