USP1 Inhibitor Screening Assay Kit
The USP1 Inhibitor Screening Assay Kit is a 96-well format fluorogenic assay kit designed to measure the activity of the deubiquitinating (DUB) enzyme USP1 (ubiquitin specific peptidase 1) for screening and profiling applications. The kit contains enough purified USP1/UAF1 (ubiquitin specific peptidase 1 associated factor 1) complex, Ubiquitinated-AMC substrate, and assay buffer for 100 reactions.
To determine the effect of an inhibitor on USP1 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 the 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, with a 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.
Need us to run inhibitor screens or profile your compounds against USP1? Check out our Protease Screening Services or Ubiquitination Screening Services.
- Adjustable micropipettor and sterile tips
- Fluorescence plate reader
| Catalog # | Name | Amount | Storage |
| 101667 | USP1 (G670A, G671A)/UAF1 Complex* | 4 µg | -80°C |
| 81150 | Ub-AMC Substrate | 5 µl | -80°C |
| 79274 | 10x PR-01 Assay Buffer | 3 x 1 ml | -80°C |
| 0.5 M DTT | 200 µl | -20°C | |
| 79685 | 96-well black microplate | 1 | Room Temp |
*The concentration of protein is lot-specific and will be indicated on the tube containing the protein
Ubiquitin specific peptidase 1 (USP1) belongs to a large group of ubiquitin-specific proteases capable of cleaving ubiquitin from other proteins. These enzymes are also referred to as deubiquitinating peptidases, deubiquitinases (DUBs), ubiquitin proteases, ubiquitin hydrolases or ubiquitin isopeptidases. They contribute to the ubiquitin signaling pathway by countering the signal induced by ubiquitin conjugating enzymes and ligases. DUBs are a new therapeutic target for neurodegenerative diseases, cancer, diabetes, and autoimmune pathologies.
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