– UHRF1 PHD inhibitor MLD4 is a specific compound that selectively inhibits the UHRF1-histone interaction (IC50=12.4 uM), targets the PHD finger of UHRF1, specifically disrupting histone H3 arginine 2 interactions with the PHD finger.UHRF1 PHD inhibitor MLD4 inhibited binding between H3K9me3(FAM) and UHRF1 with IC50 of 24-26 uM, displace UHRF1-histone H3 binding in cells.