作者:Matilde Aguilar-Moncayo、M. Isabel García-Moreno、Arnold E. Stütz、José M. García Fernández、Tanja M. Wrodnigg、Carmen Ortiz Mellet
DOI:10.1016/j.bmc.2010.09.003
日期:2010.11
New fluorescently-labelled sp(2)-iminosugars based on the 5N,6S-[N'-(4-aminobutyl)iminomethylidene]-6-thionojirimycin skeleton have been synthesized as photoprobes to monitor glycosidase binding. Dansyl, dapoxyl and coumarin fluorophores were appended to the terminal amino group at the N'-substituent by either sulfonamide or amide bridging reaction. All the conjugates behaved as strong (low micromolar to nanomolar) and selective inhibitors of beta-glucosidases (almonds and bovine liver) and naringinase, in agreement with the inhibition pattern previously encountered for related iso(thio)urea-type bicyclic sp(2)-iminosugars. The presence of the fluorescent probe allows real-time and continuous monitoring of beta-glucosidase inhibition by fluorescence resonance energy transfer (FRET), taking advantage of the intrinsic tryptophan-associated fluorescence of the protein. (C) 2010 Elsevier Ltd. All rights reserved.