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Updated: Feb 6, 2026

Simultaneous Measurement of HDAC1 and HDAC6 Activity in HeLa Cells Using UHPLC-MS
Published on: August 10, 2017
Quantitative measurement of intracellular HDAC1/2 drug occupancy using a trans-cyclooctene largazole thiol probe
Hua Xu1, Lee R Roberts1, Song Chou2
1Pfizer Inc. Medicine Design , 610 Main Street , Cambridge , MA 02135 , USA .
Abstract:
Histone deacetylases (HDACs) regulate diverse cellular processes, and are promising targets for a number of diseases. Here we describe the design and utilization of a largazole-based chemical probe to quantitatively measure the intracellular occupancy of HDAC1 and HDAC2 by dacinostat. Surprisingly, the probe was unable to enrich HDAC3 despite its nanomolar potency in a biochemical assay, further proving the necessity of cell-based target occupancy assays to understand compound potency in physiologically-relevant settings. This occupancy assay has the potential to aid the development of novel HDAC1/2 inhibitors in drug discovery.
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