Can stimulate E2F-dependent transcription. Binds DNA cooperatively with E2F family members 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. The E2F1:DP complex appears to mediate both cell proliferation and apoptosis. Blocks adipocyte differentiation by repressing CEBPA binding to its target gene promoters (PubMed:20176812). Component of the E2F:DP transcription factor complex. Forms heterodimers with E2F family members. The complex can interact with hypophosphorylated retinoblastoma protein RB1 and related proteins (RBL1 and RBL2) that inhibit the E2F transactivation domain. This repression involves recruitment of histone deacetylase (HDAC). During the cell cycle, from mid-to-late G1 phase, RB family members become phosphorylated, detach from the DRTF1/E2F complex to render E2F transcriptionally active. Part of the E2F6.com-1 complex in G0 phase is composed of E2F6, MGA, MAX, TFDP1, CBX3, BAT8, EUHMTASE1, RING1, RNF2, MBLR, L3MBTL2 YAF2. Component of the DREAM complex (also named LINC complex) at least composed of E2F4, E2F5, LIN9, LIN37, LIN52, LIN54, MYBL1, MYBL2, RBL1, RBL2, RBBP4, TFDP1 and TFDP2. The complex exists in quiescent cells where it represses cell cycle-dependent genes. It dissociates in S phase when LIN9, LIN37, LIN52 and LIN54 form a subcomplex that binds to MYBL2. The complex TFDP1:E2F1 interacts with CEBPA; the interaction prevents CEBPA binding to target gene promoters and represses its transcriptional activity (By similarity). Shuttles between the cytoplasm and nucleus and translocates into the nuclear compartment upon heterodimerization with E2F1. In the intestinal epithelium, first expressed in undifferentiated and mesenchymal tissues, levels increasing by 12.5 dpc in the epithelial compartment. With epithelial differentiation at 15.5 dpc, Its expression increases substantially in the intervillus epithelium with lower levels in the mesenchyme. At later stages, expression continues in the intervillus epithelium. Also found at lower levels in the developing villi. In the developing brain, highest levels found between 11.5 and 13.5 dpc in the ventricular region. In the developing retina, it is expressed both in retinoblast and ganglion cell layers from 14.5 dpc to 6 days after birth. In other developing tissues, its expression is highest in the thymus. Also present in kidney, lung, liver, heart and chondrocytes. Weakly expressed in skeletal muscle and absent from choroid plexus. Ubiquitinated by the BCR(KBTBD5) complex, leading to its subsequent degradation. Phosphorylation by E2F1-bound cyclin A-CDK2, in the S phase, inhibits E2F-mediated DNA binding and transactivation. Belongs to the E2F/DP family.