Fig. 3. Co-crystal structure of MRK-740 bound to PRDM9.
a Surface representation of PRDM9 PR domain (white) bound by SAM (blue) and MRK-740. b Intermolecular interactions between MRK-740 and its binding pocket. Hydrophobic interactions (light blue), pi–pi interactions (yellow), CH–pi interactions (pink) and polar interactions (green) are represented by dashes. Structural alignment with the mouse holoenzyme (PDB accession code 4C1Q) showing steric clashes between MRK-740 and (c) the substrate lysine residue (green) and (d) the post-SET substrate recognition helix when in an active, substrate-bound conformation (orange). The corresponding helix in the inhibited, human structure is shown in (teal).