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Mol. Cell. Biol., 05 1995, 2536-2546, Vol 15, No. 5
CL Wu, LR Zukerberg, C Ngwu, E Harlow and JA Lees
The mammalian transcription factor E2F plays an important role in
regulating the expression of genes that are required for passage through
the cell cycle. This transcriptional activity is inhibited by association
with the retinoblastoma tumor suppressor protein (pRB) or its relatives
p107 and p103. The first cDNA from the E2F family to be cloned was
designated E2F-1, and multiple E2F family members have now been identified.
They bind to DNA as heterodimers, interacting with proteins known as DP.
Here we demonstrate that DP is also a family of polypeptides with at least
two members (hDP-1 and hDP-2). Both hDP-1 and hDP-2 bind to all E2F family
members in vivo, and each complex is capable of activating transcription.
However, the various E2F/DP complexes display strong differences in the
ability to bind to either pRB or p107 in vivo, and the specificity of pRB
or p107 binding is mediated by the E2F subunit.
Copyright © 1995, American Society for Microbiology
In vivo association of E2F and DP family proteins
Massachusetts General Hospital Cancer Center, Charlestown 02129, USA.
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