Ada3 is a family of proteins conserved from yeasts to humans [1]. It is an essential component of the Ada transcriptional coactivator (alteration/deficiency in activation) complex. Ada3 plays a key role in linking histone acetyltransferase-containing complexes to p53 (tumour suppressor protein) thereby regulating p53 acetylation, stability and transcriptional activation following DNA damage [2].

1: ADA3: a gene, identified by resistance to GAL4-VP16, with properties similar to and different from those of ADA2. Pina B, Berger S, Marcus GA, Silverman N, Agapite J, Guarente L; Mol Cell Biol. 1993;13:5981-5989. PMID:8413201

2: An essential role of human Ada3 in p53 acetylation. Nag A, Germaniuk-Kurowska A, Dimri M, Sassack MA, Gurumurthy CB, Gao Q, Dimri G, Band H, Band V; J Biol Chem. 2007;282:8812-8820. PMID:17272277