Emanuel Maethner, Maria-Paz Garcia-Cuellar, Constanze Breitinger, Sylvia Takacova, Vladimir Divoky, Jay L. Hess, Robert K. Slany
Stimulation of transcriptional elongation is a key activity of leukemogenic MLL fusion proteins. Here we provide evidence that MLL-ENL also inhibits polycomb-mediated silencing as a prerequisite for efficient transformation. Biochemical studies identified ENL as scaffold that contacted the elongation machinery as well as the PRC1 (polycomb repressive complex 1) component CBX8. These interactions were mutually exclusive in vitro corresponding to an antagonistic behavior of MLL-ENL and CBX8 in vivo. CBX…
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