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- W2789777795 abstract "Activity-based probes (ABPs) are widely used to monitor the activity of enzyme families in biological systems. Inferring enzyme activity from probe reactivity requires that the probe reacts with the enzyme at its active site; however, probe-labeling sites are rarely verified. Here we present an enhanced chemoproteomic approach to evaluate the activity and probe reactivity of deubiquitinase enzymes, using bioorthogonally tagged ABPs and a sequential on-bead digestion protocol to enhance the identification of probe-labeling sites. We confirm probe labeling of deubiquitinase catalytic Cys residues and reveal unexpected labeling of deubiquitinases on non-catalytic Cys residues and of non-deubiquitinase proteins. In doing so, we identify ZUFSP (ZUP1) as a previously unannotated deubiquitinase with high selectivity toward cleaving K63-linked chains. ZUFSP interacts with and modulates ubiquitination of the replication protein A (RPA) complex. Our reactive-site-centric chemoproteomics method is broadly applicable for identifying the reaction sites of covalent molecules, which may expand our understanding of enzymatic mechanisms." @default.
- W2789777795 created "2018-03-29" @default.
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- W2789777795 date "2018-03-21" @default.
- W2789777795 modified "2023-10-01" @default.
- W2789777795 title "Reactive-site-centric chemoproteomics identifies a distinct class of deubiquitinase enzymes" @default.
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- W2789777795 doi "https://doi.org/10.1038/s41467-018-03511-6" @default.
- W2789777795 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5862848" @default.
- W2789777795 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29563501" @default.
- W2789777795 hasPublicationYear "2018" @default.
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