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• W2137642502 endingPage "3614" @default.
• W2137642502 startingPage "3606" @default.
• W2137642502 abstract "p107 is a member of the pocket family of proteins that includes the retinoblastoma tumor suppressor. Overexpression of p107 arrests cells in G1, suggesting that it is important for cell cycle control. This growth suppression is mediated at least in part through the interaction of p107 with a member of the E2F family of cell cycle transcription factors, and this interaction can be disrupted by oncoproteins from DNA tumor viruses such as adenovirus E1a that bind p107. Not only does the binding of p107 to E2F inactivate E2F, but also we show that when p107 is tethered to the promoter through binding to E2F it functions as a general transcriptional repressor. This general repressor activity was also evident when p107 was fused to the DNA binding domain of Gal4 so that it could be directly targeted to the promoter in an E2F-independent fashion. Using p107 mutants, we compared the regions of the protein required for transcriptional repression and cell growth suppression. We found that the pocket domain is sufficient for inactivation of E2F, general repressor activity, and most of the growth suppressor activity. Binding of conserved region 1 from Ela to p107 blocked interaction with E2F, but it did not affect general repressor activity, demonstrating that binding and inactivation of E2F and general repressor activity are distinguishable properties of p107. Within the pocket, two conserved domains, A and B, were sufficient for growth suppression and transcriptional repressor activity. Surprisingly, we found that these two domains were fully functional when they were coexpressed as separate proteins, and we present results suggesting that the domains may interact at the promoter to form an active pocket." @default.
• W2137642502 created "2016-06-24" @default.
• W2137642502 creator A5010703227 @default.
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• W2137642502 date "1996-07-01" @default.
• W2137642502 modified "2023-10-12" @default.
• W2137642502 title "Transcriptional Repression and Growth Suppression by the p107 Pocket Protein" @default.
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• W2137642502 doi "https://doi.org/10.1128/mcb.16.7.3606" @default.
• W2137642502 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/231356" @default.
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• W2137642502 hasPublicationYear "1996" @default.
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