Abstract
Enhancers and promoters, cis-acting regulators of mammalian gene expression, are modular units containing multiple short binding sites for specific trans-acting transcription factors. To investigate if factors binding to enhancer sequences are functionally different from promoter-binding factors, we asked if a short DNA sequence element in the immunoglobulin kappa (kappa) light chain enhancer that binds to the nuclear factor NF-kappa B could also serve as a functional promoter element. A synthetic oligonucleotide containing this binding site was placed in either orientation upstream of the beta-globin TATA-element. In myeloma cells, the NF-kappa B binding site efficiently directed transcription. The promoter activity was directly correlated with the presence of the nuclear factor NF-kappa B: there was no transcription in fibroblasts or in unstimulated pre-B cells where the factor was absent. Transcription could be stimulated in pre-B cells by treatments known to activate NF-kappa B. Thus, the same nuclear factor can act as a positive activator of both enhancer and promoter function, suggesting that the two functions involve similar events in the transcription process.
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Selected References
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