Abstract
The retinoblastoma protein (pRB) plays an important role in the control of cell proliferation, apparently by binding to and regulating cellular transcription factors such as E2F. Here we describe the characterization of a cDNA clone that encodes a protein with properties of E2F. This clone, RBP3, was identified by the ability of its gene product to interact with pRB. RBP3 bound to pRB both in vitro and in vivo, and this binding was competed by viral proteins known to disrupt pRB-E2F association. RBP3 bound to E2F recognition sequences in a sequence-specific manner. Furthermore, transient expression of RBP3 caused a 10-fold transactivation of the adenovirus E2 promoter, and this transactivation was dependent on the E2F recognition sequences. These properties suggest that RBP3 encodes E2F, or an E2F-like protein.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Base Sequence
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Binding, Competitive
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Carrier Proteins / biosynthesis
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Carrier Proteins / chemistry*
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Carrier Proteins / metabolism
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Cell Cycle Proteins*
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Cloning, Molecular
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DNA / metabolism
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DNA-Binding Proteins*
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E2F Transcription Factors
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Molecular Sequence Data
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Recombinant Proteins / biosynthesis
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Retinoblastoma Protein / metabolism*
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Retinoblastoma-Binding Protein 1
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Transcription Factors / chemistry*
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Transcription Factors / metabolism
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Viral Proteins / metabolism
Substances
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Carrier Proteins
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Cell Cycle Proteins
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DNA-Binding Proteins
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E2F Transcription Factors
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Recombinant Proteins
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Retinoblastoma Protein
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Retinoblastoma-Binding Protein 1
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Transcription Factors
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Viral Proteins
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DNA
Associated data
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GENBANK/L05499
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GENBANK/M87278
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GENBANK/M94130
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GENBANK/M94264
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GENBANK/M96577
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GENBANK/S72766
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GENBANK/S72767
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GENBANK/S72768
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GENBANK/S72769
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GENBANK/S72771