E2F-independent transcriptional repression by p107, a member of the retinoblastoma family of proteins

L. Dagnino, Liang Zhu, K. L. Skorecki, H. L. Moses

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The Rb family of proteins includes pRb, p107, and p130. These nuclear polypeptides associate with cyclins and transcription factors involved in the control of cell proliferation. This has suggested that members of the pRb family may modulate cell growth, at least in part, by regulating gene transcription. We have investigated the ability of p107 to modulate transcription and compared it with that of pRb. Whereas pRb inhibition of the c-myc promoter required the presence of E2F sites, p107 inhibition did not. Moreover, p107, but not pRb, repressed transcription from other promoters including fibronectin, herpes virus thymidine kinase, and a synthetic promoter containing a SV40 repeat activator motif upstream from the adenovirus major late-promoter TATA box. In contrast, the activity of the TATA-lacking promoters from the epidermal growth factor receptor and the cytoplasmic phospholipase A2 genes was unaffected by either p107 or pRb. Likewise, overexpression of p107 or pRb had no effect on the activity of a synthetic promoter lacking a TATA box and containing the SV40 repeat motif upstream from the terminal transferase gene initiator element. The domains in p107 required for transcriptional repression included the A segment of the pocket region and parts of the B segment, but not the spacer domain. In spite of their structural similarities, p107 and pRb may contribute to the control of cell proliferation by modulating the transcription of different genes.

Original languageEnglish (US)
Pages (from-to)191-198
Number of pages8
JournalCell Growth and Differentiation
Volume6
Issue number2
StatePublished - 1995
Externally publishedYes

Fingerprint

Retinoblastoma Protein
TATA Box
Genes
Cell Proliferation
Cyclins
Aptitude
Thymidine Kinase
Phospholipases A2
Transferases
Fibronectins
Epidermal Growth Factor Receptor
Adenoviridae
Transcription Factors
Viruses
Peptides
Growth
Inhibition (Psychology)

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

Cite this

E2F-independent transcriptional repression by p107, a member of the retinoblastoma family of proteins. / Dagnino, L.; Zhu, Liang; Skorecki, K. L.; Moses, H. L.

In: Cell Growth and Differentiation, Vol. 6, No. 2, 1995, p. 191-198.

Research output: Contribution to journalArticle

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