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- W4243314293 abstract "The synthesis of monofluorescein, monorhodamine, and mono-4-nitrobenz-2-oxa-1,3-diazole (NBD) derivatives of glucagon is reported. The fluorescent groups were introduced by converting tryptophan-25 to 2-thioltryptophan using thiol-specific fluorescent reagents. All derivatives retained the ability to activate adenylate cyclase when compared to glucagon and thus were considered full agonists. IC50 values of 6.8·10−9, 1.7·10−8, 1.8·10−8 and 5.4·10−9 M were measured in rat liver membranes for NBD-, fluorescein-, rhodamine-Trp25-glucagon and native glucagon, respectively. From the IC50 values Kd values of 2.16·10−9, 4·10−9, 2·10−9, and 1.72·10−9 M were calculated for the binding of NBD-, fluorescein-, rhodamine-Trp25-glucagon and native glucagon, respectively. The highest quantum yield (0.18) of the monomer derivatives was obtained with fluorescein-Trp25-glucagon in phosphate-buffered saline (pH 7.4). Difluorescein-glucagon was also prepared by reacting the amino groups of histidine-1 and lysine-12 with fluorescein isothiocyanate and dimer derivatives were prepared using fluorescein-labelled 2-thiolTrp25-glucagon. Difluorescein-glucagon bound only weakly to glucagon receptors and displayed antagonist properties. The dimer derivative formed from two difluorescein-2-thiolTrp25-glucagon molecules had similar poor binding qualities, whereas the dimer formed from difluorescein-2-thiolTrp25-glucagon and 2-thiolTrp25-glucagon exhibited, at low concentrations, properties similar to monofluorescein-glucagon. Both dimer derivatives were only sparingly soluble in aqueous medium. Specific binding of fluorescein-Trp25-glucagon and difluorescein-glucagon to rat hepatocytes was followed using flow cytometry." @default.
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- W4243314293 date "1988-10-01" @default.
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- W4243314293 title "Fluorescent glucagon derivatives. I. Synthesis and characterisation of fluorescent glucagon derivatives" @default.
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- W4243314293 doi "https://doi.org/10.1016/s0005-2728(88)80044-6" @default.
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