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The activated form of p53 is not a transactivator of the intracisternal A particle long terminal repeat promoter.

Published observations have suggested that the activated form of p53 protein could transactivate the Intracisternal A particle long terminal repeat promoter (IAP-LTR). In this paper we demonstrate that the increased expression from this promoter was due to effects of the co-transferred plasmids and not p53 per se. In transient expression experiments, co-transfer of either a p53 or a p53 frame-shift mutant plasmid with an IAP-LTR driven chloramphenicol acetyl transferase (CAT) plasmid gave a similar increase in CAT activity. Further, this increase in CAT gene activity could also be achieved by co-transfer of a plasmid containing a viral promoter alone.