Transcription factor that binds promoters containing the CryR2 element, 5'-ACATAWCT-3' (PubMed:25877331). The DNA-binding activity is decreased upon direct physical interaction with the mediator subunits and is modulated by redox conditions (PubMed:25877331). The oxidized protein is the preferential binding form (PubMed:25877331). Mono-, di- and oligomers (PubMed:25877331). Associated with the Mediator complex (PubMed:17560376). Interacts with MED6 (PubMed:17560376). Interacts with MED10A, MED28 and MED32 (PubMed:25877331). Interacts with DEK3 (PubMed:25387881). Belongs to the GeBP family. Truncated N-terminus.