A multivalent engagement of ENL with MOZ

Area of Science:

• Molecular Biology
• Epigenetics
• Cancer Research

Background:

• The eleven-nineteen-leukemia (ENL) protein and monocytic leukemia zinc finger (MOZ) protein are epigenetic cofactors crucial for transcriptional regulation.
• Both ENL and MOZ are implicated in the pathogenesis of aggressive leukemia.
• Understanding their interaction is key to deciphering leukemic mechanisms.

Purpose of the Study:

• To elucidate the mechanistic basis of the association between ENL and MOZ.
• To investigate how ENL and MOZ interact at the molecular level.
• To explore the role of this interaction in leukemogenesis.

Main Methods:

• Genomic analysis to identify co-occupied genomic regions.
• Structural studies to determine the binding interfaces.
• Biochemical assays to characterize protein-protein interactions and post-translational modifications.

Main Results:

• ENL and MOZ were found to co-occupy active gene promoters, with MOZ recruiting ENL.
• Structural analysis revealed a multivalent assembly of ENL on the intrinsically disordered region (IDR) of MOZ.
• ENL's ET domain binds to a motif in MOZ IDR, while its YEATS domains interact with acetylation sites generated by CREB-binding protein (CBP).

Conclusions:

• A multifaceted coupling of ENL, MOZ, and CBP/p300, involving both acetylation-dependent and independent mechanisms, was identified.
• This intricate interaction network may contribute to the leukemogenic activity of the ENL-MOZ complex.
• The findings provide insights into the role of these proteins in chromosomal translocations associated with leukemia.