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L3MBTL3 recognizes mono- and dimethylated lysine residues on histone tails. The recently reported X-ray cocrystal structures of the chemical probe UNC1215 and inhibitor UNC2533 bound to the methyl-lysine reading MBT domains of L3MBTL3 demonstrate a unique and flexible 2:2 dimer mode of recognition. In this study, we describe our in vitro analysis of L3MBTL3 dimerization via its MBT domains and additionally show that this dimerization occurs within a cellular context in the absence of small molecule ligands. Furthermore, mutations to the first and second MBT domains abrogated L3MBTL3 dimerization both in vitro and in cells. These observations are consistent with the hypothesis that L3MBTL3 engages methylated histone tails as a dimer while carrying out its normal function and provides an explanation for the presence of repeated MBT domains within L3MBTL3.

The L3MBTL3 Methyl-Lysine Reader Domain Functions As a Dimer