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Screening of DUB activity and specificity by MALDI-TOF mass spectrometry

2014; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês

10.1038/ncomms5763

2041-1723

Maria Stella Ritorto, Richard Ewan, Ana B. Pérez‐Oliva, Axel Knebel, Sara J. Buhrlage, Melanie Wightman, Sharon M. Kelly, Nicola T. Wood, Satpal Virdee, Nathanael S. Gray, Nicholas A. Morrice, Dario R. Alessi, Matthias Trost,

Cancer, Hypoxia, and Metabolism

Deubiquitylases (DUBs) are key regulators of the ubiquitin system which cleave ubiquitin moieties from proteins and polyubiquitin chains. Several DUBs have been implicated in various diseases and are attractive drug targets. We have developed a sensitive and fast assay to quantify in vitro DUB enzyme activity using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. Unlike other current assays, this method uses unmodified substrates, such as diubiquitin topoisomers. By analysing 42 human DUBs against all diubiquitin topoisomers we provide an extensive characterization of DUB activity and specificity. Our results confirm the high specificity of many members of the OTU and JAB/MPN/Mov34 metalloenzyme DUB families and highlight that all USPs tested display low linkage selectivity. We also demonstrate that this assay can be deployed to assess the potency and specificity of DUB inhibitors by profiling 11 compounds against a panel of 32 DUBs. Deubiquitylases (DUBs) remove ubiquitin chains from proteins. Here the authors develop a mass spectrometry-based DUB activity screen using unmodified diubiquitin isomers to characterize substrate specificity for 42 human DUBs, and assess the potency and selectivity of 11 DUB inhibitors.