Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Bioluminescent Assay of Bovine Liver Riboflavin Kinase Using a Bactreial Luciferase Coupled Reaction

  • Cho, Ki-Woong (Laboratory of Marine Natural Products Division of Marine Chemistry Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Kyunggi-do 425-600)
  • Published : 2000.03.01
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Abstract

For the demonstration of a novel riboflavin kinase assay method based on the bacterial bioluminescence, partially purified riboflavin kinase was prepared from bovine liver through ammonium sulfate precipitation and DEAE-cellulose ion exchange chromatography. Using bacterial luciferase from Photobacterium phosphoreum and the dithionite reduction method, and easy, safe, and fast assay method was established. The optimal temperature, pH, Km values form riboflavin and ATP of boving liver riboflavin kinase determined with this luminescence method were 35$^{\circ}C$, pH 7, 15.3${\mu}$M and 8.3.${\mu}$M, respectively. The detection limit of FMN produced by riboflavin kinase was in the range of 200 pM to 4${\mu}$M which is comparable to the HPLC-fluorescence detection method, while the detection time for each assay was less than 15 sec compared to the HPLC method which requeires at least 10 min for completion.

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References

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