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Updated: May 10, 2026

Fluorescence Anisotropy as a Tool to Study Protein-protein Interactions
Published on: October 21, 2016
Fluorescein aldehyde with disulfide functionality as a fluorescence turn-on probe for cysteine and homocysteine in
1Department of Chemistry, Hankuk University of Foreign Studies, Yongin 449-791, Republic of Korea.
Abstract:
We developed a fluorescein aldehyde probe with disulfide functionality for the fluorescence detection of biologically important thiols. The probe displayed highly selective responses to cysteine (Cys) and homocysteine (Hcy) over glutathione (GSH) due to the rapid ring formation reaction of Cys and Hcy with the aldehyde group of the probe and the concomitant cleavage of the disulfide group followed by subsequent intramolecular cyclization. The fluorescent probe also exhibited a highly sensitive fluorescence turn-on response to Hcy with a detection limit of 2.4 μM Hcy in HEPES buffer.
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