USP2 Inhibitor Screening Assay Kit

The Ubiquitin specific peptidase 2 (USP2) Inhibitor Screening Assay Kit is a homogeneous fluorogenic assay designed to measure the activity of the deubiquitinating (DUB) enzyme USP2 for screening and profiling applications. The kit contains enough purified USP2 recombinant protein, Ubiquitinated-AMC substrate, and assay buffer for 100 reactions.

To determine the effect of an inhibitor on USP2 activity, the enzyme should be preincubated with or without the test inhibitor prior to adding the Ub-AMC substrate to the reaction. The assay was functionally validated using Ub-Aldehyde, a potent inhibitor of DUB subfamilies Ubiquitin C-terminal Hydrolases (UCHs), Ubiquitin-Specific Proteases (USPs), Ovarian Tumor Proteases (OTU), and Machado-Josephin Domain (MJD) proteases.

Figure 1: Illustration of the assay principle.
Ubiquitin-AMC is a fluorogenic substrate for ubiquitin hydrolases based on the C-terminus derivatization of ubiquitin with 7-amido-4-methylcoumarin (AMC). In the conjugated form, the energy emitted from fluorochrome AMC is quenched. Upon proteolysis, AMC is no longer quenched and emits fluorescence with an λexcitation/ λemission maxima of 350/460 nm. The increase in fluorescence is proportional to the DUB activity.