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Coumarin-based blue excitable probe for functional screening of dehalogenase activity

Mion, S.; Mallet, M.; Louis, Y.; Fontanay, S.; Ruaudel, F.; Bastian, F.; Jacolot, M.; Popowycz, F.; Oger, P. M.

2026-10-05 biochemistry
10.64898/2026.10.02.756220 bioRxiv
Show abstract

In the enzymatic toolbox of depollution, hydrolytic dehalogenases are of particular interest for the bioremediation of organohalogenated compounds. To better identify and characterize these enzymes, it is important to develop appropriate sensing methods. Fluorescent probes for dehalogenase detection have been developed in the past years, however, to this date none were available for application using the common FITC parameters (i.e. excitation laser at 488 nm). To address this limitation, we herein report a new fluorescent probe, COU4-Cl, excitable in the violet (405 nm) and blue (488 nm) wavelengths adapted for the detection and characterization of haloalkane dehalogenases. Its applicability is discussed and evaluated in comparison to the previously described COU2-Cl probe only excitable in the violet (405 nm). This study shows the advantages and complementarity of the two probes, and further demonstrate their application for the discrimination of dehalogenase activity in whole cell assays.

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