Abstract
Dynamic histone methylation regulates gene activation and repression. It is involved in proliferation, differentiation, lineage specification, and development. Histone demethylase assays are invaluable in studying histone demethylation substrate recognition, kinetics, regulation, and inhibition by small molecules, many of which are potential therapeutics. Here we describe general procedures to purify recombinant enzymes from different expression hosts, and to prepare a broad range of substrates, as well as to set up a variety of in vitro histone demethylase assays. These assays provide useful tools for discoveries from enzymes to drugs.
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