Protein AATF (AATF) functions as a general inhibitor of the histone deacetylase HDAC1. The binding of AATF to the pocket region of RB1 may displace HDAC1 from RB1/E2F comple, Xenopus/Amphibian,es, leading to activation of E2F target genes and cell cycle progression. Conversely, displacement of HDAC1 from SP1 bound to the CDKN1A promoter leads to increased e, Xenopus/Amphibian,pression of this CDK inhibitor and blocks cell cycle progression. AATF also antagonizes PAWR mediated induction of aberrant amyloid peptide production in Alzheimer