Cloning, expression, and transcriptional properties of the human enhancer factor TEF-1.
We describe the cDNA encoding the SV40 transcriptional enhancer factor 1 ( TEF-1) and show that its translation initiates exclusively at an AUU codon in vivo. Cloned TEF-1, which is unrelated to other known transcription factors, specifically binds the SV40 GT-IIC and Sph enhansons. Cloned TEF-1 does not activate these enhansons in lymphoid MPC11 cells where they are known to be inactive, but represses the endogenous HeLa TEF-1 activity in vivo and in vitro. Repression is also observed with chimeras where the DNA-binding domain of the GAL4 activator replaces that of TEF-1, showing that repression results from interference/squelching. Such chimeras stimulate transcription in HeLa, but not in MPC11, cells in vivo and in HeLa cell extracts in vitro. However, high concentrations result in self-interference/squelching. These results strongly suggest that the trans-activation function of TEF-1 is mediated by a highly limiting, possible cell-specific, titratable transcriptional intermediary factor(s).[1]References
- Cloning, expression, and transcriptional properties of the human enhancer factor TEF-1. Xiao, J.H., Davidson, I., Matthes, H., Garnier, J.M., Chambon, P. Cell (1991) [Pubmed]
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