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• W2056146570 abstract "The enzyme purine nucleoside phosphorylase (PNP) is a target for the discovery of new lead compounds employed on the treatment severe T-cell mediated disorders. Within this context, the development of new, direct, and reliable methods for ligands screening is an important task. This paper describes the preparation of fused silica capillaries human PNP (HsPNP) immobilized enzyme reactor (IMER). The activity of the obtained IMER is monitored on line in a multidimensional liquid chromatography system, by the quantification of the product formed throughout the enzymatic reaction. The K(M) value for the immobilized enzyme was about twofold higher than that measured for the enzyme in solution (255 ± 29.2 μM and 133 ± 14.9 μM, respectively). A new fourth-generation immucillin derivative (DI4G; IC(50)=40.6 ± 0.36 nM), previously identified and characterized in HsPNP free enzyme assays, was used to validate the IMER as a screening method for HsPNP ligands. The validated method was also used for mechanistic studies with this inhibitor. This new approach is a valuable tool to PNP ligand screening, since it directly measures the hypoxanthine released by inosine phosphorolysis, thus furnishing more reliable results than those one used in a coupled enzymatic spectrophotometric assay." @default.
• W2056146570 created "2016-06-24" @default.
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• W2056146570 date "2012-04-01" @default.
• W2056146570 modified "2023-10-16" @default.
• W2056146570 title "Capillary bioreactors based on human purine nucleoside phosphorylase: A new approach for ligands identification and characterization" @default.
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• W2056146570 doi "https://doi.org/10.1016/j.chroma.2011.10.056" @default.
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