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Anal Biochem. 2009 May 15;388(2):235-41. doi: 10.1016/j.ab.2009.02.039. Epub 2009 Mar 10.

A Phos-tag-based fluorescence resonance energy transfer system for the analysis of the dephosphorylation of phosphopeptides.

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Department of Functional Molecular Science, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3, 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 system for the detection of phosphopeptides using a phosphate-binding tag molecule, Zn(2+)-Phos-tag (1,3-bis[bis(pyridin-2-ylmethyl)amino]propan-2-olato dizinc(II) complex) attached with a 7-amino-4-methylcoumarin-3-acetic acid (AMCA). Carboxyfluorescein (FAM)-labeled phospho- and nonphosphopeptides were prepared as the target molecules for the FRET system. A set of FAM (a fluorescent acceptor, lambda(em) 520nm) and AMCA (a fluorescent donor, lambda(ex) 345nm) is frequently used for a FRET system. The AMCA-labeled Zn(2+)-Phos-tag specifically captured the FAM-labeled phosphopeptide to form a stable 1:1 complex, resulting in efficient FRET. After the FAM-labeled phosphopeptide was dephosphorylated with alkaline phosphatase, the FRET disappeared. Using this FRET system, we demonstrated the detection of the time-dependent dephosphorylation of the FAM-labeled protein-tyrosine phosphatase 1B substrate.

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