The protein encoded by this gene is a member of the E2F family of transcription factors. The E2F family plays a crucial role in the control of cell cycle and action of tumor suppressor proteins and is also a target of the transforming proteins of small DNA tumor viruses. The E2F proteins contain several evolutionally conserved domains found in most members of the family. These domains include a DNA binding domain, a dimerization domain which determines interaction with the differentiation regulated transcription factor proteins (DP), a transactivation domain enriched in acidic amino acids, and a tumor suppressor protein association domain which is embedded within the transactivation domain. This protein and another 2 members, E2F1 and E2F3, have an additional cyclin binding domain. This protein binds specifically to retinoblastoma protein pRB in a cell-cycle dependent manner, and it exhibits overall 46% amino acid identity to E2F1.
^Crowley TE, Kaine EM, Yoshida M, Nandi A, Wolgemuth DJ (August 2002). "Reproductive cycle regulation of nuclear import, euchromatic localization, and association with components of Pol II mediator of a mammalian double-bromodomain protein". Mol. Endocrinol. 16 (8): 1727–37. PMID12145330. doi:10.1210/me.2001-0353.
Magae J, Wu CL, Illenye S, Harlow E, Heintz NH (1997). "Nuclear localization of DP and E2F transcription factors by heterodimeric partners and retinoblastoma protein family members". J. Cell. Sci. 109 (7): 1717–26. PMID8832394.
Hofmann F, Livingston DM (1996). "Differential effects of cdk2 and cdk3 on the control of pRb and E2F function during G1 exit". Genes Dev. 10 (7): 851–61. PMID8846921. doi:10.1101/gad.10.7.851.
Wu L, Timmers C, Maiti B, Saavedra HI, Sang L, Chong GT, Nuckolls F, Giangrande P, Wright FA, Field SJ, Greenberg ME, Orkin S, Nevins JR, Robinson ML, Leone G (2001). "The E2F1-3 transcription factors are essential for cellular proliferation". Nature. 414 (6862): 457–62. PMID11719808. doi:10.1038/35106593.
Yamochi T, Semba K, Tsuji K, Mizumoto K, Sato H, Matsuura Y, Nishimoto I, Matsuoka M (2002). "ik3-1/Cables is a substrate for cyclin-dependent kinase 3 (cdk 3)". Eur. J. Biochem. 268 (23): 6076–82. PMID11733001. doi:10.1046/j.0014-2956.2001.02555.x.
Crowley TE, Kaine EM, Yoshida M, Nandi A, Wolgemuth DJ (2003). "Reproductive cycle regulation of nuclear import, euchromatic localization, and association with components of Pol II mediator of a mammalian double-bromodomain protein". Mol. Endocrinol. 16 (8): 1727–37. PMID12145330. doi:10.1210/me.2001-0353.