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Angewandte Chemie International Edition

Angewandte Chemie International Edition

IF: 16.1
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A Direct Fluorescent Activity Assay for Glycosyltransferases Enables Convenient High-Throughput Screening: Application to O-GlcNAc Transferase

Published:24 February 2020 DOI: 10.1002/anie.202000621 PMID: 32092778
Matthew G. Alteen, Dr. Christina Gros, Dr. Richard W. Meek, David A. Cardoso, Jil A. Busmann, Gontran Sangouard, Matthew C. Deen, Hong-Yee Tan, David L. Shen, Cecilia C. Russell, Prof. Gideon J. Davies, Prof. Phillip J. Robinson, Prof. Adam McCluskey, Prof. David J. Vocadlo

Abstract

Glycosyltransferases carry out important cellular functions in species ranging from bacteria to humans. Despite their essential roles in biology, simple and robust activity assays that can be easily applied to high-throughput screening for inhibitors of these enzymes have been challenging to develop. Herein, we report a bead-based strategy to measure the group-transfer activity of glycosyltransferases sensitively using simple fluorescence measurements, without the need for coupled enzymes or secondary reactions. We validate the performance and accuracy of the assay using O-GlcNAc transferase (OGT) as a model system through detailed Michaelis–Menten kinetic analysis of various substrates and inhibitors. Optimization of this assay and application to high-throughput screening enabled screening for inhibitors of OGT, leading to a novel inhibitory scaffold. We believe this assay will prove valuable not only for the study of OGT, but also more widely as a general approach for the screening of glycosyltransferases and other group-transfer enzymes.

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