E2F-1, PBR3, PRB-binding protein E2F-1, RBAP-1, RBBP-3, RBBP3.
Transcription activator that binds DNA cooperatively with DP proteins through the E2 recognition site, 5-TTTC[CG]CGC-3 found in the promoter region of a number of genes whose products are involved in cell cycle regulation or in DNA replication.