RIZ1: Proteins and Enzymes

RIZ1 (Retinoblastoma proteininteracting zinc finger), also known as PRDM2, is a nuclear protein containing 8 zinc finger motifs. RIZ1 contains a PR domain that may function as protein binding interface in the regulation of chromatin-mediated gene expression. RIZ 1 acts as a tumor suppressor, and RIZ 1 inactivation is common in many types of human cancers, including neuroendocrine, breast, liver, colon, skin, and lymphoid tumors. Similarly, RIZ1 over-expression in breast cancer cells caused cell cycle arrest in G2-M and apoptosis. RIZ1 is highly expressed in human retinoblastoma cells and at low levels in all other human cell lines.