The present invention relates to compound that bind Histone H3-lysine79 (H3K79) methyl transferase (DOTIL). The disclosed compounds are useful as for assessing the activity of DOTIL and for identifying inhibitors of DOTIL. Described herein are probes useful for both assessing the activity of DOTIL and identifying inhibitors of DOTIL. These probes can be used in various assays, including Amplified Luminescent Proximity Homogeneous Assays ("ALPHA" assays), Differential Scanning Fluorimetry (DFS) Assay, and Fluorescence Polarization (FP) assays used for high-throughput screening (HTS) for small molecule drug discovery. The compounds can also be used as a pull down agent for target identification.
