PUBCHEM_BIOASSAY: SAR Selectivity Analysis of small molecule inhibitors of PEST using pCAP in a fluorescence assay. (Class of assay: confirmatory) [Related pubchem assays (depositor defined):AID1779, AID1784, AID2135]
Enzyme Kinetic Assay: PTP activity was assayed using p-nitrophenyl phosphate (pNPP) as a substrate in 3,3-dimethylglutarate buffer (50 mM 3,3-dimethylglutarate, pH 7.0, 1 mM EDTA, 150 mM NaCl, 2 mM DTT, 0.1 mg/mL BSA) at 25° C. The assays were performed in 96-well plates. Normally, to determine the IC50 values, the reaction was initiated by the addition of enzyme (final concentration at 10 nM) to a reaction mixture (0.2 mL) containing 2 mM (Km for the substrate) pNPP with various concentrations of inhibitors. The reaction rate was measured using a SpectraMax Plus 384 Microplate Spectrophotometer (Molecular Devices). To determine the mode of inhibition, the reactions were initiated by the addition of PTP-MEG2 to the reaction mixtures (0.2 mL) containing various concentrations of pNPP with different concentrations of the inhibitor 7.
Inhibition of PTP-PEST (unknown origin) using p-nitrophenyl phosphate as substrate preincubated for 10 mins followed by substrate addition measured every minute for 10 mins by UV-VIS spectrophotometric analysis
Inhibition of recombinant human PTP-PEST using p-nitrophenyl phosphate as substrate preincubated for 10 mins followed by substrate addition and measured every minute for 10 mins by UV-VIS spectrophotometric analysis
Inhibition of PTPN12 (unknown origin) assessed as change in enzyme activity at 150 uM using tyrosine phosphopeptide-2 substrate incubated for 15 mins relative to control
Competitive inhibition of PTP-PEST (unknown origin) assessed as inhibition constant using varying level of pNPP as substrate by Lineweaver-Burk plot analysis
Inhibition of PTP-PEST (unknown origin) expressed in Escherichia coli BL21 using p-nitrophenyl phosphate as substrate measured after 30 mins by UV-vis spectrophotometric method
Inhibition of PTPN12 (unknown origin) pre-incubated for 20 mins followed by fluorescence substrate addition and measured after 120 mins by DiFMUP assay
Inhibition of His-tagged PTP-PEST (unknown origin) expressed in Escherichia coli BL21 cells using para-nitrophenyl phosphate as substrate incubated for 5 to 10 mins by microplate reader based spectrophotometric analysis