Figure 4. Comparison between DUX4 and HoxB1-Pbx1 Heterodimer.
(A and B) A side-by-side comparison between DUX4 (A) and HoxB1-Pbx1 heterodimer (B) (LaRonde-LeBlanc and Wolberger, 2003; Piper et al., 1999) bound to respective DNA substrate, highlighting similarity in the positioning of a key Trp residue in coordinating the two homeodomains. (C and D) Close-up views of DUX4 (C) and HoxB1-Pbx1 heterodimer (D) bound to respective DNA substrate (as in A and B) highlighting distinct local interactions surrounding the key Trp residue docked in a hydrophobic pocket.