Abstract
The promoter of the cholecystokinin (CCK) gene possesses evolutionary conserved juxtaposed E-box and cAMP/TPA responsive elements (CRE/TRE). We have examined the functional interaction of these two sites. As previously noted, c-Jun/c-Fos heterodimers greatly increase promoter activity through association with the CRE/TRE. Mutation of the E-box enhanced the activation by c-Jun/c-Fos, as well as stimulation by forskolin and bFGF, that acts through the CRE/TRE site. Moreover, c-Jun/c-Fos stimulation was inhibited by co-expression of c-Myc and Max. The results indicate that factors associating with the E-box exhibit a negative cooperative effect on the activation via the CRE/TRE element. We propose that this mechanism plays a significant role in CCK gene transcription and other genes with juxtaposed E-box and CRE/TRE.
| Original language | English |
|---|---|
| Journal | FEBS Letters |
| Volume | 448 |
| Issue number | 1 |
| Pages (from-to) | 15-8 |
| Number of pages | 4 |
| ISSN | 0014-5793 |
| DOIs | |
| Publication status | Published - 1 Apr 1999 |
| Externally published | Yes |
Keywords
- Animals
- Base Sequence
- Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
- Basic-Leucine Zipper Transcription Factors
- Cholecystokinin/genetics
- Cyclic AMP/metabolism
- Cyclic AMP Response Element-Binding Protein/genetics
- DNA-Binding Proteins/genetics
- Gene Expression Regulation
- Helix-Loop-Helix Motifs
- Humans
- Leucine Zippers
- Mice
- Molecular Sequence Data
- Mutagenesis
- Promoter Regions, Genetic
- Proto-Oncogene Proteins c-fos/genetics
- Proto-Oncogene Proteins c-jun/genetics
- Proto-Oncogene Proteins c-myc/genetics
- Response Elements
- Tetradecanoylphorbol Acetate/metabolism
- Transcription Factors/genetics
- Tumor Cells, Cultured
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