Abstract
The DOT1L lysine methyltransferase has emerged as a validated therapeutic target in MLL-rearranged (MLLr) acute leukemias. Although S-adenosylmethionine competitive inhibitors have demonstrated pharmacological proof-of-principle in MLLr-leukemia, these compounds require further optimization to improve cellular potency and pharmacokinetic stability. Limiting DOT1L inhibitor discovery and ligand optimization have been complex biochemical methods often using radionucleotides and cellular methods requiring prolonged culture. We therefore developed a new suite of assay technologies that allows comparative assessment of chemical tools for DOT1L in a miniaturized format. Coupling these assays with structural information, we developed new insights into DOT1L ligand binding and identified several functionalized probes with increased cellular potency (IC50 values ∼10 nM) and excellent selectivity for DOT1L. Together these assay technologies define a platform capability for discovery and optimization of small-molecule DOT1L inhibitors.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenosine / analogs & derivatives
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Adenosine / chemical synthesis
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Adenosine / pharmacology
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Antineoplastic Agents / chemical synthesis*
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Antineoplastic Agents / pharmacology
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Cell Line, Tumor
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Enzyme Inhibitors / chemical synthesis*
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Enzyme Inhibitors / pharmacology
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Epithelial Cells / drug effects
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Epithelial Cells / enzymology
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Epithelial Cells / pathology
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Gene Expression Regulation, Neoplastic*
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High-Throughput Screening Assays*
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Histone-Lysine N-Methyltransferase
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Histones / antagonists & inhibitors*
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Histones / genetics
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Histones / metabolism
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Humans
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Ligands
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Methylation
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Methyltransferases / antagonists & inhibitors*
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Methyltransferases / chemistry
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Methyltransferases / genetics
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Methyltransferases / metabolism
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Models, Molecular
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Phenylurea Compounds / chemical synthesis
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Phenylurea Compounds / pharmacology
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / metabolism
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S-Adenosylmethionine / chemistry
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S-Adenosylmethionine / metabolism
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Small Molecule Libraries / chemical synthesis
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Small Molecule Libraries / pharmacology
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Structure-Activity Relationship
Substances
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Antineoplastic Agents
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EPZ004777
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Enzyme Inhibitors
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Histones
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Ligands
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Phenylurea Compounds
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Recombinant Fusion Proteins
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Small Molecule Libraries
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S-Adenosylmethionine
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DOT1L protein, human
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Methyltransferases
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Histone-Lysine N-Methyltransferase
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Adenosine