Acts as a transcriptional repressor. Increases DNMT3B-mediated repressive transcriptional activity when DNMT3B is tethered to DNA. May link molecule between DNMT3B and other co-repressor proteins (By similarity). Forms homodimers. Heterodimer (via HD1 domain) with ZHX2 (via HD1 domain). Also forms a heterodimer with ZHX3 which is a prerequisite for repressor activity. Interacts with ATF7IP and NFYA. Interacts (via homeobox domains) with DNMT3B (via PWWP domain) (By similarity). Colocalized in the nucleus with DNMT3B. Widely expressed with highest levels in brain. By interleukin-2. Belongs to the ZHX family.