A miniaturized screen for inhibitors of Jumonji histone demethylases.
2-Oxoglutarate- and Fe(ii)-dependent oxygenases are a major class of N(epsilon)-methyl lysine demethylases that are involved in epigenetic regulation. Assays suitable for implementation in a high-throughput manner have been lacking for these enzymes. Here, we describe the design and implementation of a robust and miniaturized high-throughput kinetic assay for inhibitors of JMJD2E using a formaldehyde dehydrogenase-coupled reaction with real-time fluorescence detection. Reactant compatibility studies resulted in simplification of the assay scheme to the mixing of two reagent solutions, both of which were stable overnight. The assay was miniaturized to a 4 microL volume in 1536-well format and was used to screen the library of pharmacologically active compounds (LOPAC(1280)). Inhibitors identified by the screen were further characterized in secondary assays including FDH counterscreen and demethylation assays that monitored demethylation by MALDI-TOF MS. The assay developed here will enable the screening of large compound libraries against the Jumonji demethylases in a robust and automated fashion.
Sakurai
Masaaki
M
NIH Chemical Genomics Center, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892-3370, USA.
Rose
Nathan R
NR
Schultz
Lena
L
Quinn
Amy M
AM
Jadhav
Ajit
A
Ng
Stanley S
SS
Oppermann
Udo
U
Schofield
Christopher J
CJ
Simeonov
Anton
A
D000445:Aldehyde Oxidoreductases / Q000378:metabolism; D055808:Drug Discovery / Q000379:methods; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006801:Humans; D056484:Jumonji Domain-Containing Histone Demethylases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D007700:Kinetics; D008904:Miniaturization / Q000379:methods; D013050:Spectrometry, Fluorescence / Q000379:methods; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D004791:Enzyme Inhibitors; D056484:Jumonji Domain-Containing Histone Demethylases; D000445:Aldehyde Oxidoreductases; C087006:formaldehyde dehydrogenase, glutathione-independent