Adaptor proteins are usually required for transcriptional activation, possibly to acetylate and destabilize nucleosomes, thereby relieving chromatin constraints at the promoter.TADA3L is a transcriptional activator adaptor and has been found to be part of the PCAF histone acetylase complex. In addition, it associates with the tumor suppressor protein p53 and is required for full activity of p53 and p53-mediated apoptosis.