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Applied Microbiology and Biotechnology

, Volume 73, Issue 6, pp 1251–1258 | Cite as

Applications of whole-cell bacterial sensors in biotechnology and environmental science

  • Kiyohito YagiEmail author
Mini-Review

Abstract

Biosensors have major advantages over chemical or physical analyses with regard to specificity, sensitivity, and portability. Recently, many types of whole-cell bacterial biosensors have been developed using recombinant DNA technology. The bacteria are genetically engineered to respond to the presence of chemicals or physiological stresses by synthesizing a reporter protein, such as luciferase, β-galactosidase, or green fluorescent protein. In addition to an overview of conventional biosensors, this minireview discusses a novel type of biosensor using a photosynthetic bacterium as the sensor strain and the crtA gene, which is responsible for carotenoid synthesis, as the reporter. Since bacteria possess a wide variety of stress-response mechanisms, including antioxidation, heat-shock responses, nutrient-starvation, and membrane-damage responses, DNA response elements for several stress-response proteins can be fused with various reporter genes to construct a versatile set of bacterial biosensors for a variety of analytes. Portable biosensors for on-site monitoring have been developed using a freeze-dried biosensing strain, and cell array biosensors have been designed for high-throughput analysis. Moreover, in the future, the use of single-cell biosensors will permit detailed analyses of samples. Signals from such sensors could be detected with digital imaging, epifluorescence microscopy, and/or flow cytometry.

Keywords

Whole-cell biosensor Reporter gene Luciferase β-galactosidase Green fluorescent protein crtA 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Graduate School of Pharmaceutical SciencesOsaka UniversitySuitaJapan

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