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Assay Method Information |
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| | Biochemical Assay |
| Description: | The potency of Class IIa Histone Deacetylase (HDAC) inhibitors is quantified by measuring the Histone Deacetylase 4 (HDAC4) catalytic domain enzymatic activity using the Class IIa selective substrate, Boc-Lys(Tfa)-AMC. The substrate is deacetylated to Boc-Lys-AMC by HDAC4. Cleavage by trypsin results in the release of the fluorophore AMC from the deacetylated substrate. The fluorescence of the sample is directly related to the histone deacetylase activity in the sample. 2 ul (200x) of each diluted solution and each control (full activity: 100% DMSO alone or full inhibition 1 mM) is stamped into V-bottomed polypropylene 384-well compound plates using either the Bravo (384-well head from Agilent) or 12.5 ul 16-channel Matrix multi-channel pipette (Matrix Technologies Ltd). Each well with the 200x compound solution is diluted 1:20 by the addition of 38 ul assay buffer+DMSO (10.5% DMSO, 45 mM Tris-HCl, 123 mM NaCl, 2.4 mM KCl, and 0.9 mM MgCl2 at pH 8.0 and equilibrated to room temperature) just prior to the addition of the enzyme to the assay. |
| Affinity data for this assay | |
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