A Phos-Tag-Based Fluorescence Quenching System for Activity Assay and Inhibitor Screening for Alkaline Phosphatase
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Department
of Functional Molecular Science, Institute of Biomedical & Health
Sciences, Hiroshima University, Hiroshima, Japan.
Department of Structure-Function Physical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
Department of Structure-Function Physical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
Fluorescence resonance energy transfer (FRET) is a
distance-dependent interaction between the electronic excited states of
two dye molecules. Here we introduce a novel FRET-based fluorescence
quenching system for assaying the activity of alkaline phosphatase (AP)
by using a phos-phate-binding tag molecule, Phos-tag
{1,3-bis[bis(pyridine-2-ylmethyl)amino]propan-2-olato dizinc(II)
complex}, attached to a nonfluorescent
4-{[4-(dimethylamino)phenyl]diazenyl}benzoyl (Dabcyl: λmax 475 nm) dye group. The fluorogenic biomolecule riboflavin 5’-phosphate (FMN: λem
525 nm) was used as an AP substrate. The Dabcyl-labeled Phos-tag
specifically captured FMN to form a stable 1:1 complex, resulting in
efficient fluorescence quenching. The quenching efficiency was more than
95% for a mixture of 12 μM FMN and 13.5 μM Dabcyl-labeled Phos-tag in
aqueous solution at pH 7.4 and 25°C. When FMN was dephosphorylated with
AP, riboflavin was released into the solution and fluorescence from the
flavin moiety appeared. By using this quenching system, we succeeded in
detecting time- and dose-dependent dephosphorylation of FMN by AP under
near-physiological conditions.
KEYWORDS
Cite this paper
Kinoshita-Kikuta, E. , Kurosaki, H. , Kunisada, N. ,
Kinoshita, E. and Koike, T. (2014) A Phos-Tag-Based Fluorescence
Quenching System for Activity Assay and Inhibitor Screening for Alkaline
Phosphatase. American Journal of Analytical Chemistry, 5, 796-804. doi: 10.4236/ajac.2014.512088.
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