coiled coil domain of disruptor of telomeric-silencing 1-like (DOT1L) and similar proteins
This family contains DOT1L (disruptor of telomeric-silencing 1-like), a non-SET domain histone lysine methyltransferase (HKMT) that catalyzes monomethylation, dimethylation, and trimethylation of nucleosomal H3K79. DOT1L is recruited to the homeobox A by AF10 (ALL1-Fused gene from chromosome 10 protein), one of the mixed-lineage leukemia 1 (MLL1)-fusion partners that function in acute myeloid leukemia (ALL). Aberration of the MLL gene is implicated in acute leukemia; chromosomal translocations of MLL1 generate oncogenic chimeric proteins, containing the non-catalytic N-terminal portion of MLL1 fused with many partners such as AF10. The aberrant recruitment of DOT1L by MLL fusions and the resulting H3K79 methylation are thought to affect gene expression by altering chromatin accessibility. AF10 and DOT1L interact through their coiled coil domains.