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The retinoblastoma susceptibility gene-product represses transcription when directly bound to the promoter

Academic Article
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Overview

authors

  • Adnane, J.
  • Shao, Z. H.
  • Robbins, Paul D.

publication date

  • April 1995

journal

  • Journal of Biological Chemistry  Journal

abstract

  • Rb represses E2F-mediated transcription in part by blocking the trans-activation domain of E2F. In addition, Rb can convert an E2F binding site from a positive to a negative element. To examine the effect of a Rb-DNA-bound complex on transcription, full-length Rb was fused to the DNA binding domain of GAL4. Here, we report that GAL4-Rb can repress transcription mediated by either Sp1, AP-1, or p53, dependent upon the presence of both the GAL4 DNA binding domain and GAL4 binding sites. Moreover, GAL4-Rb inhibited the activity of the herpes simplex virus tk promoter from GAL4 binding sites located at a distance from the promoter. In contrast, GAL4-Rb was unable to repress basal transcription. Cotransfection of specific cyclins and cyclin-dependent kinases or SV40 T-antigen abolished the repressive activity of GAL4-Rb. The domains of Rb involved in mediating the repression of transcription were mapped to regions that are overlapping, but not identical, to those required for the interaction with E2F. We propose that Rb can function as a general repressor of transcription when bound to the promoter region.

subject areas

  • Antigens, Polyomavirus Transforming
  • Base Sequence
  • Binding Sites
  • Cyclin-Dependent Kinases
  • Cyclins
  • DNA-Binding Proteins
  • Fungal Proteins
  • Gene Expression Regulation
  • Molecular Sequence Data
  • Oligodeoxyribonucleotides
  • Promoter Regions, Genetic
  • Protein Binding
  • Retinoblastoma Protein
  • Saccharomyces cerevisiae Proteins
  • Transcription Factor AP-1
  • Transcription Factors
  • Transcription, Genetic
  • Tumor Suppressor Protein p53
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Identity

International Standard Serial Number (ISSN)

  • 0021-9258

PubMed ID

  • 7721791
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Additional Document Info

start page

  • 8837

end page

  • 8843

volume

  • 270

issue

  • 15

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