Abstract
Nuclear receptor-binding SET domain protein 2 (NSD2) is a histone H3 lysine 36 (H3K36)-specific methyltransferase enzyme that is overexpressed in a number of cancers, including multiple myeloma. NSD2 binds to S-adenosyl-l-methionine (SAM) and nucleosome substrates to catalyze the transfer of a methyl group from SAM to the ε-amino group of histone H3K36. Equilibrium binding isotope effects and density functional theory calculations indicate that the SAM methyl group is sterically constrained in complex with NSD2, and that this steric constraint is released upon nucleosome binding. Together, these results show that nucleosome binding to NSD2 induces a significant change in the chemical environment of enzyme-bound SAM.
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