P22077 (1247819-59-5) is a selective (tested against 23 other DUBs) inhibitor of USP7 (IC50?= 8 μM) and the closely related USP47.1,2?It destabilizes claspin, a scaffolding protein involved in regulating Chk1 kinase, a DNA damage response enzyme.2?P22077 inhibits neuroblastoma growth?via?induction of p53-mediated apoptosis.3?N-Myc was destabilized by P22077 inhibition of USP7 in human neuroblastoma cells.4?It was able to stabilize p53 levels in conjunction with an Mdm2 inhibitor (Nutlin-3,?Cat# 10-1350)?in HCT116 colorectal carcinoma cells.5
P22077 is an analog of the ubiquitin-specific protease (USP7) inhibitor P5091. It inhibits USP7, as well.
1) Tian?et al. (2011),?Characterization of Selective Ubiquitin and Ubiquitin-like Protease Inhibitors Using a Fluorescence-Based Multiplex Assay Format; Assay Drug Dev. Technol.?9?165
2) Altun?et al.?(2011),?Activity-based chemical proteomics accelerates inhibitor development for deubiquitinylating enzymes; Chem. Biol.?18?1401
3) Fan?et al.?(2013),?USP7 inhibitor P22077 inhibits neuroblastoma growth via inducing p53-mediated apoptosis;?Cell Death Dis.?4?e867
4) Tavana?et al.?(2016),?HAUSP deubiquitinates and stabilizes M-Myc in neuroblastoma; Nat. Med.?22?1180
5) Tavana?et al.?(2018),?Targeting HAUSP in both p53 wildtype and p53-mutant tumors; Cell Cycle?17?823
