Abstract
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.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amino Acid Sequence
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Animals
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Base Sequence
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Carrier Proteins*
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Cell Cycle Proteins*
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Cell Line
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DNA / metabolism
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DNA, Complementary / genetics
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism*
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Drosophila Proteins*
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E2F Transcription Factors
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E2F1 Transcription Factor
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Gene Expression
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Humans
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Mice
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Molecular Sequence Data
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Protein Binding
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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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Retinoblastoma-Binding Protein 1
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Trans-Activators / genetics
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Trans-Activators / metabolism*
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Transcription Factor DP1
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Transcription Factors / genetics
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Transcription Factors / metabolism*
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Transcriptional Activation
Substances
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Arid4a protein, mouse
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Carrier Proteins
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Cell Cycle Proteins
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DNA, Complementary
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DNA-Binding Proteins
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Dp transcription factor, Drosophila
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Drosophila Proteins
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E2F Transcription Factors
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E2F1 Transcription Factor
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E2F1 protein, human
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E2f1 protein, mouse
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RNA, Messenger
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Retinoblastoma-Binding Protein 1
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Tfdp1 protein, mouse
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Trans-Activators
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Transcription Factor DP1
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Transcription Factors
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DNA