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Identification of a promoter-specific transcriptional activation domain at the C terminus of the Wnt effector protein T-cell factor 4.

Wnt growth factors control numerous cell fate decisions in development by altering specific gene expression patterns through the activity of heterodimeric transcriptional activators. These consist of beta-catenin and one of the four members of the T-cell factor (TCF) family of DNA-binding proteins. How can the Wnt/beta-catenin pathway control various sets of target genes in distinct cellular settings with such a limited number of nuclear effectors? Here we asked whether different TCF proteins could perform specific, nonredundant functions at natural beta-catenin/TCF-regulated promoters. We found that TCF4E but not LEF1 supported beta-catenin-dependent activation of the Cdx1 promoter, whereas LEF1 specifically activated the Siamois promoter. Deletion of a C-terminal domain of TCF4E prevented Cdx1 promoter induction. A chimeric protein consisting of LEF1 and the C terminus of TCF4E was fully functional. Therefore, the TCF4E C terminus harbors a promoter-specific transactivation domain. This domain influences the DNA binding properties of TCF4 and additionally mediates an interaction with the transcriptional coactivator p300. Apparently, the C terminus of TCF4E cooperates with beta-catenin and p300 to form a specialized transcription factor complex that specifically supports the activation of the Cdx1 promoter.

Pubmed ID: 12446687


  • Hecht A
  • Stemmler MP


The Journal of biological chemistry

Publication Data

February 7, 2003

Associated Grants


Mesh Terms

  • Animals
  • Base Sequence
  • Cytoskeletal Proteins
  • E1A-Associated p300 Protein
  • Electrophoretic Mobility Shift Assay
  • Enhancer Elements, Genetic
  • Homeodomain Proteins
  • Humans
  • Mice
  • Nuclear Proteins
  • Phosphorylation
  • Promoter Regions, Genetic
  • TCF Transcription Factors
  • Trans-Activators
  • Transcription Factor 7-Like 2 Protein
  • Transcription Factors
  • Transcriptional Activation
  • beta Catenin