title: p300 regulates p63 transcriptional activity.
abstract: The transcriptional co-activator p300 has been reported to regulate the tumor suppressor p53 and its ortholog p73. Here we describe a study showing that this coactivator also regulates the transcriptional function of p63. p300 bound to the N-terminal domain of p63gamma, and p63gamma bound to the N terminus of p300 in vitro and in cells. p300, but not its acetylase-defective mutant AT2, stimulated p63gamma-dependent transcription and induction of p21 in cells, consequently leading to G1 arrest. Inversely, the deltaN-p63gamma isoform as well as p300AT2 inhibited the induction of p21 by p63gamma. These results suggest that p300 regulates p63-dependent transcription of p21.
authors.affiliation: Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, Oregon 97239, USA.
authors.forename: Mary
authors.initials: M
authors.lastname: MacPartlin
authors.forename: Shelya
authors.initials: S
authors.lastname: Zeng
authors.forename: Hunjoo
authors.initials: H
authors.lastname: Lee
authors.forename: Daniel
authors.initials: D
authors.lastname: Stauffer
authors.forename: Yetao
authors.initials: Y
authors.lastname: Jin
authors.forename: Mathew
authors.initials: M
authors.lastname: Thayer
authors.forename: Hua
authors.initials: H
authors.lastname: Lu
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000378:metabolism; D002460:Cell Line; D045744:Cell Line, Tumor; D050759:Cyclin-Dependent Kinase Inhibitor p21; D004268:DNA-Binding Proteins; D016147:Genes, Tumor Suppressor / Q000502:physiology*; D005982:Glutathione Transferase / Q000378:metabolism; D006639:Histidine / Q000737:chemistry; D006801:Humans; D047468:Immunoprecipitation; D009154:Mutation; D009687:Nuclear Proteins / Q000378:metabolism / Q000502:physiology*; D010750:Phosphoproteins / Q000235:genetics / Q000502:physiology*; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D014157:Transcription Factors; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D014162:Transfection; D025521:Tumor Suppressor Proteins
chemical_list: C493956:CDKN1A protein, human; D018797:Cell Cycle Proteins; D050759:Cyclin-Dependent Kinase Inhibitor p21; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; C115051:TP63 protein, human; D015534:Trans-Activators; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; D006639:Histidine; D005982:Glutathione Transferase