title: Acetylation of beta-catenin by p300 regulates beta-catenin-Tcf4 interaction.
abstract: Lysine acetylation modulates the activities of nonhistone regulatory proteins and plays a critical role in the regulation of cellular gene transcription. In this study, we showed that the transcriptional coactivator p300 acetylated beta-catenin at lysine 345, located in arm repeat 6, in vitro and in vivo. Acetylation of this residue increased the affinity of beta-catenin for Tcf4, and the cellular Tcf4-bound pool of beta-catenin was significantly enriched in acetylated form. We demonstrated that the acetyltransferase activity of p300 was required for efficient activation of transcription mediated by beta-catenin/Tcf4 and that the cooperation between p300 and beta-catenin was severely reduced by the K345R mutation, implying that acetylation of beta-catenin plays a part in the coactivation of beta-catenin by p300. Interestingly, acetylation of beta-catenin had opposite, negative effects on the binding of beta-catenin to the androgen receptor. Our data suggest that acetylation of beta-catenin in the arm 6 domain regulates beta-catenin transcriptional activity by differentially modulating its affinity for Tcf4 and the androgen receptor. Thus, our results describe a new mechanism by which p300 might regulate beta-catenin transcriptional activity.
authors.affiliation: Unité d'Oncogenèse et Virologie Moléculaire (INSERM U579), Institut Pasteur, 75015 Paris, France.
authors.forename: Laurence
authors.initials: L
authors.lastname: Lévy
authors.forename: Yu
authors.initials: Y
authors.lastname: Wei
authors.forename: Charlotte
authors.initials: C
authors.lastname: Labalette
authors.forename: Yuanfei
authors.initials: Y
authors.lastname: Wu
authors.forename: Claire-Angélique
authors.initials: CA
authors.lastname: Renard
authors.forename: Marie Annick
authors.initials: MA
authors.lastname: Buendia
authors.forename: Christine
authors.initials: C
authors.lastname: Neuveut
mesh_terms: D000107:Acetylation; D000123:Acetyltransferases / Q000378:metabolism*; D000595:Amino Acid Sequence; D018797:Cell Cycle Proteins / Q000378:metabolism*; D002460:Cell Line; D003598:Cytoskeletal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D017930:Genes, Reporter; D051548:Histone Acetyltransferases; D006801:Humans; D008239:Lysine / Q000378:metabolism; D008969:Molecular Sequence Data; D010455:Peptides / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D051820:TCF Transcription Factors; D015534:Trans-Activators / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D058118:Transcription Factor 7-Like 2 Protein; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D051153:Wnt Proteins; D029961:Zebrafish Proteins; D051176:beta Catenin; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor
chemical_list: D000123:Acetyltransferases; D018797:Cell Cycle Proteins; D003598:Cytoskeletal Proteins; D004268:DNA-Binding Proteins; D051548:Histone Acetyltransferases; D008239:Lysine; D010455:Peptides; D011518:Proto-Oncogene Proteins; D011993:Recombinant Fusion Proteins; D051820:TCF Transcription Factors; D015534:Trans-Activators; D058118:Transcription Factor 7-Like 2 Protein; D014157:Transcription Factors; D051153:Wnt Proteins; D029961:Zebrafish Proteins; D051176:beta Catenin; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor; C495270:CTNNB1 protein, human; C544894:TCF7L2 protein, human