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Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Binuclear terbium(III) complex as a probe for tyrosine phosphorylation.

Hiroki Akiba1, Jun Sumaoka, Makoto Komiyama

  • 1Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo, 153-8904 Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 15, 2010
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Summary

Researchers developed a new method using terbium (Tb(III)) binuclear complexes to selectively detect phosphorylated tyrosine (pTyr) in peptides. This technique offers sensitive and real-time monitoring of enzymatic phosphorylation events.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Materials Science

Background:

  • Phosphorylated tyrosine (pTyr) plays a crucial role in cellular signaling pathways.
  • Accurate detection of pTyr is essential for understanding disease mechanisms and drug development.
  • Existing methods for pTyr detection can be limited in sensitivity or specificity.

Purpose of the Study:

  • To develop a novel luminescent assay for selective detection of phosphorylated tyrosine (pTyr) residues in peptides.
  • To investigate the utility of binuclear terbium (Tb(III)) complexes for pTyr sensing.
  • To enable real-time monitoring of enzymatic phosphorylation reactions.

Main Methods:

  • Synthesis and characterization of binuclear Tb(III) complexes (Tb(2)-L(1) and Tb(2)-L(2)).
  • Luminescence spectroscopy to measure the interaction between Tb(III) complexes and phosphorylated peptides.
  • Testing selectivity against non-phosphorylated tyrosine, phosphoserine, phosphothreonine, and other biomolecules.
  • Real-time monitoring of peptide phosphorylation by tyrosine kinase.

Main Results:

  • Binuclear Tb(III) complexes selectively enhanced luminescence upon binding to pTyr residues in neutral aqueous solutions.
  • The assay showed high selectivity, with minimal interference from non-phosphorylated Tyr, pSer, pThr, or other phosphate-containing biomolecules.
  • The binding affinity of binuclear complexes for pTyr was significantly higher (two orders of magnitude) than mononuclear complexes.
  • Successful real-time monitoring of enzymatic peptide phosphorylation by tyrosine kinase was achieved.

Conclusions:

  • Binuclear Tb(III) complexes provide a sensitive and selective platform for pTyr detection.
  • This luminescent assay enables efficient real-time monitoring of tyrosine kinase activity.
  • The developed method holds potential for applications in biochemical research and diagnostics.