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• W3000986029 abstract "PNGases are crucial targets and valuable tools in analyzing asparagine-linked carbohydrate moieties (N-glycans) of glycoproteins. Activity tests of PNGases have been little improved since their discovery four decades ago, and still rely on observing deglycosylation patterns of glycoproteins or glycopeptides using SDS-PAGE or HPLC analysis. These techniques cannot be easily adapted for automated sampling and high-throughput procedures. Herein, we describe a PNGase activity assay which relies on the conversion of WST-1, a yellowish, water-soluble tetrazolium dye (sodium 2-(4-Iodophenyl)-3-(4-nitro-phenyl)-5-(2,4-disulfophenyl)-2H-tetrazolate), into a blue formazan dye. In this work, we showed that WST-1 could be reduced by N-glycans, which were enzymatically released from glycoprotein substrates. After optimization of the assay conditions, the robustness of the method was challenged by quantifying the activity of various PNGase isoforms at different purification stages using a microwell plate reader. Furthermore, the assay could be used to obtain steady-state kinetics of PNGase H+ wild-type and mutant variants, which showed significant differences in their enzymatic reaction rates. The simplicity and robustness of this method might be of benefit for the detection of PNGase activity in routine applications of large amounts of samples." @default.
• W3000986029 created "2020-01-30" @default.
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• W3000986029 date "2019-01-01" @default.
• W3000986029 modified "2023-10-16" @default.
• W3000986029 title "Development of a colorimetric PNGase activity assay" @default.
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• W3000986029 doi "https://doi.org/10.1016/j.carres.2018.11.007" @default.
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