May be involved in transcriptional regulation. Has in vitro transcription inhibition activity. Acts as a tumor suppressor in hepatocellular carcinoma (HCC) cells. Self-associates (via leucine zipper). Interacts (via leucine zipper) with ZIPK/DAPK3 (via leucine zipper). Interacts with MAD4. Expressed in liver and testis. Expressed in the seminiferous tubules (at protein level). Belongs to the TCP10 family.