The retinoblastoma protein modulates Tbx2 functional specificity

Keith W Vance, Heather M Shaw, Mercedes Rodriguez, Sascha Ott, Colin R Goding

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Tbx2 is a member of a large family of transcription factors defined by homology to the T-box DNA-binding domain. Tbx2 plays a key role in embryonic development, and in cancer through its capacity to suppress senescence and promote invasiveness. Despite its importance, little is known of how Tbx2 is regulated or how it achieves target gene specificity. Here we show that Tbx2 specifically associates with active hypophosphorylated retinoblastoma protein (Rb1), a known regulator of many transcription factors involved in cell cycle progression and cellular differentiation, but not with the Rb1-related proteins p107 or p130. The interaction with Rb1 maps to a domain immediately carboxy-terminal to the T-box and enhances Tbx2 DNA binding and transcriptional repression. Microarray analysis of melanoma cells expressing inducible dominant-negative Tbx2, comprising the T-box and either an intact or mutated Rb1 interaction domain, shows that Tbx2 regulates the expression of many genes involved in cell cycle control and that a mutation which disrupts the Rb1-Tbx2 interaction also affects Tbx2 target gene selectivity. Taken together, the data show that Rb1 is an important determinant of Tbx2 functional specificity.

Original languageEnglish
Pages (from-to)2770-9
Number of pages10
JournalMolecular Biology of the Cell
Volume21
Issue number15
DOIs
Publication statusPublished - 1 Aug 2010

Keywords

  • Amino Acid Motifs
  • Amino Acid Sequence
  • Cell Line
  • DNA
  • Humans
  • Melanoma
  • Molecular Sequence Data
  • Phosphorylation
  • Protein Binding
  • Protein Interaction Mapping
  • Protein Structure, Tertiary
  • Repressor Proteins
  • Retinoblastoma Protein
  • T-Box Domain Proteins
  • Transcription, Genetic

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