Involved in the regulation of the G1/S transition. Increases the DNA binding activity of E2F proteins after heterodimerization. The complex DPB/E2FC restricts cell division and lateral root initiation and may function as a negative regulator of E2F-regulated genes. The interaction with SKP2A is controlled by auxin. Heterodimer with non-phosphorylated E2FC. No interaction with phosphorylated E2FC. Interacts preferentially with E2FC, but also with E2FA and E2FB. Interacts with SKP2A. Targeted for proteasomal degradation by the SCF(SKP2A) E3 ubiquitin ligase complex. Ubiquitous. Expressed during the whole cell cycle. The DIM domain (182-263) is required for heterodimerization. Phosphorylated. Belongs to the E2F/DP family.