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High-throughput Functional Screening using a Homemade Dual-glow Luciferase Assay
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Single bacterial cell detection using a mutant luciferase.

Kenichi Noda1, Tadahiro Matsuno, Hiroya Fujii

  • 1Interdisciplinary Research on Integration of Semiconductor and Biotechnology, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima, 739-8530, Japan. noda@hiroshima-u.ac.jp

Biotechnology Letters
|January 29, 2008
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Summary

Researchers developed a super-bright luciferase for highly sensitive ATP detection. This breakthrough allows for the detection of single bacterial cells, enabling the identification of contamination at one colony-forming unit (c.f.u.).

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • The wild-type luciferase from Photinus pyralis is a key enzyme for bioluminescence.
  • Enhanced enzyme activity is crucial for sensitive detection methods.

Purpose of the Study:

  • To develop a genetically modified luciferase with significantly increased luminescence intensity.
  • To assess the utility of this enhanced luciferase for detecting minute quantities of adenosine triphosphate (ATP).
  • To evaluate its application in detecting low levels of bacterial contamination.

Main Methods:

  • Genetic modification of Photinus pyralis luciferase to enhance luminescence.
  • Quantification of ATP detection limits using the modified luciferase.
  • Testing the detection of bacterial contamination using colony-forming units (c.f.u.).

Main Results:

  • The genetically modified luciferase exhibits over 10-fold higher luminescence intensity compared to the wild-type.
  • The enhanced enzyme enables ATP detection at concentrations as low as 10(-18) mol.
  • Bacterial contamination, including Escherichia coli and Bacillus subtilis, was detectable at levels of one c.f.u.

Conclusions:

  • The engineered luciferase provides unprecedented sensitivity for ATP detection.
  • This technology offers a powerful tool for detecting single bacterial cells.
  • The method is effective for identifying bacterial contamination at very low levels.