Involved in lineage commitment of primary hemopoietic progenitors by restricting erythroid formation and enhancing myeloid formation.
Interferes with erythropoietin-induced erythroid terminal differentiation by preventing cells from exiting the cell cycle through suppression of CDKN1B/p27Kip1 levels.
Suppresses RFWD2/COP1 activity via CSN3 which activates p53 and induces cell cycle arrest.
Binds DNA and affects the expression of a number of genes so may function as a transcription factor in the nucleus.Yoneda-Kato N., Oncogene 12:265-275(1996) [PubMed: 8570204].