... (Fig. 2A). The zinc ions are requiredfor the structural integrity of the protein, as mutation of any of the cysteine residues involved in zinc coordina-tion results in protein unfolding [22]. The ... CBP, CREB-binding protein; CREB, cAMP response element-binding;H3K4, histone H3 lysine 4; HMT, histone methyltransferase; MLL1, mixed lineage leukemia protein-1; PHD, plant homeodomain;TAD, transactivation ... element-binding (CREB) binding protein(CBP) [23], a peptide from the Win motif of MLL1bound to the WD40 repeat protein, WDR5 [24,25] andthe C-terminal SET domain in the presence andabsence of histone...