Transcription repressor that specifically binds to the 5'-TATTTT[T/G]-3' consensus sequence on promoters and repress transcription of PGC-1-alpha (PPARGC1A), thereby playing a role in regulation of neuron death. Interacts (via C2H2-type zinc fingers) with PRKN (By similarity). Interacts with TRIM28 (By similarity). Mainly localizes to the cytoplasm; probably translocates to the nucleus to repress selected genes. Ubiquitinated by PRKN. 'Lys-48'-linked polyubiquitination by PRKN leads to degradation by the proteasome and may play a key role in regulation of neuron death (By similarity). Belongs to the krueppel C2H2-type zinc-finger protein family.