P5091 (P005091)

Catalog No.S7132

P5091(P005091) is a selective and potent inhibitor of ubiquitin-specific protease 7 (USP7) with EC50 of 4.2 μM and the closely related USP47.

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P5091 (P005091) Chemical Structure

P5091 (P005091) Chemical Structure
Molecular Weight: 348.22

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Product Information

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  • Research Area
  • Inhibition Profile

Product Description

Biological Activity

Description P5091(P005091) is a selective and potent inhibitor of ubiquitin-specific protease 7 (USP7) with EC50 of 4.2 μM and the closely related USP47.
Targets USP7 [1] Calpain 1 [1] MMP13 [1] Cathepsin D [1]

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IC50 4.2 μM(EC50) >100 μM(EC50) >100 μM(EC50) >100 μM(EC50)
In vitro P5091 is a trisubstituted thiophene with dichlorophenylthio, nitro, and acetyl substituents mediating anti-USP7 activity. P5091 exhibits potent, specific, and selective deubiquitylating activity against USP7. In contrast, P5091 does not inhibit other DUBs or other families of cysteine proteases tested (EC50 > 100 mM). P5091 inhibits the labeling of USP7 with HA-UbVME in a concentration-dependent manner. USP7-mediated cleavage of high molecular weight polyubiquitin chains is inhibited in a dose-dependent manner by P5091. Moreover, P5091 inhibits USP7- but not USP2- or USP8-mediated cleavage of poly K48-linked ubiquitin chains. USP7 inhibition by P5091 induces HDM2 polyubiquitylation and accelerates degradation of HDM2. P5091 inhibits USP7 deubiquitylating activity, without blocking proteasome activity in MM Cells. P5091 inhibits growth in MM cells and overcomes bortezomib-resistance. P5091 induces a dose-dependent decrease in viability of various MM cell lines, including those that are resistant to conventional therapies dexamethasone (Dex) (MM.1R), doxorubicin (Dox-40), or melphalan (LR5) (IC50 range 6–14 μM). P5091 overcomes bone marrow stromal cell-induced growth of MM Cells. P5091 decreased HDM2 and HDMX, as well as upregulated p53 and p21 levels. Overall, P5091-induced cytotoxicity is mediated in part via HDM2-p21 signaling axis and although p53 is upregulated in response to P5091 treatment, the cytotoxic activity of P5091 is not dependent on p53. [1]
In vivo In animal tumor model studies, P5091 is well tolerated, inhibits tumor growth, and prolongs survival. Combining P5091 with lenalidomide, HDAC inhibitor SAHA, or dexamethasone triggers synergistic anti-MM activity. [1]

Protocol(Only for Reference)

Kinase Assay: [1]

Ubiquitin Protease Assays Recombinant enzymes in 20 mM Tris-HCl (pH 8.0), 2 mM CaCl2, and 2 mM β-mercaptoethanol are incubated with dose ranges of P5091 for 30 min in a 96-well plate before the addition of Ub-PLA2 and NBD C6-HPC or Ub-EKL and EKL substrate. The liberation of a fluorescent product within the linear range of the assay is monitored using a Perkin Elmer Envision fluorescence plate reader. Vehicle (2% [v/v] DMSO) and 10 mM N-ethylmaleimide (NEM) are included as controls.

Animal Study: [1]

Animal Models CB-17 SCID-mice
Formulation 4% NMP (N-methyl-2-Pyrrolidone), 4% Tween-80, and 92% Milli-Q water
Dosages 10 mg/kg

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)
Body Surface Area (m2)0.0070.0250.
Km factor36128520
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)


[1] Chauhan D, et al. Cancer Cell, 2012, 22(3), 345-358.

Chemical Information

Download P5091 (P005091) SDF
Molecular Weight (MW) 348.22


CAS No. 882257-11-6
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms N/A
Solubility (25°C) * In vitro DMSO 28 mg/mL (80.4 mM)
Water <1 mg/mL
Ethanol <1 mg/mL
In vivo 4% DMSO+30% PEG 400+ddH2O 5mg/mL
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Chemical Name Ethanone, 1-[5-[(2,3-dichlorophenyl)thio]-4-nitro-2-thienyl]-

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
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