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A fluorescent probe which allows highly specific thiol labeling at low pH.

Jonas W Nielsen1, Kristine Steen Jensen, Rosa E Hansen

  • 1Department of Biology, University of Copenhagen, DK-2100 Copenhagen, Denmark.

Analytical Biochemistry
|December 20, 2011
PubMed
Summary

We developed a new fluorescent reagent, FCAD, for sensitive thiol detection. This reagent works at low pH, preserving thiol-disulfide balance in biological samples for accurate redox potential measurements.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Accurate determination of thiol-disulfide status in biological systems is difficult due to sample preparation challenges.
  • Redox pools are easily perturbed, especially under neutral to alkaline conditions needed for thiol alkylation.

Purpose of the Study:

  • To synthesize and characterize a novel thiol-specific reagent, fluorescent cyclic activated disulfide (FCAD).
  • To enable sensitive and accurate measurement of thiol-disulfide status in biological samples.

Main Methods:

  • Synthesis of fluorescent cyclic activated disulfide (FCAD) incorporating a fluorescein moiety.
  • Utilizing thiol-disulfide exchange chemistry with a reactive leaving group.
  • Performing reactions at low pH (pH 3) to minimize thiol-disulfide exchange.

Main Results:

  • FCAD demonstrates high reactivity at pH 3, allowing modification under conditions that preserve redox balance.
  • The reagent enables picomolar detection of thiols.
  • Applications include determining redox potentials and in-gel detection of labeled proteins.

Conclusions:

  • FCAD is a valuable tool for studying thiol-disulfide dynamics in biological systems.
  • Its low pH reactivity overcomes limitations of existing methods for thiol analysis.
  • FCAD facilitates sensitive detection and characterization of thiols and redox states.