title: Pleiotropic effects of p300-mediated acetylation on p68 and p72 RNA helicase.
abstract: Here, we demonstrate that p68 (DDX5) and p72 (DDX17), two homologous RNA helicases and transcriptional cofactors, are substrates for the acetyltransferase p300 in vitro and in vivo. Mutation of acetylation sites affected the binding of p68/p72 to histone deacetylases, but not to p300 or estrogen receptor. Acetylation additionally increased the stability of p68 and p72 RNA helicase and stimulated their ability to coactivate the estrogen receptor, thereby potentially contributing to its aberrant activation in breast tumors. Also, acetylation of p72, but not of p68 RNA helicase, enhanced p53-dependent activation of the MDM2 promoter, pointing at another mechanism of how p72 acetylation may facilitate carcinogenesis by boosting the negative p53-MDM2 feedback loop. Furthermore, blocking p72 acetylation caused cell cycle arrest and apoptosis, revealing an essential role for p72 acetylation. In conclusion, our report has identified for the first time that acetylation modulates RNA helicases and provides multiple mechanisms how acetylation of p68 and p72 may affect normal and tumor cells.
authors.affiliation: Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, USA.
authors.forename: Steven M
authors.initials: SM
authors.lastname: Mooney
authors.forename: Apollina
authors.initials: A
authors.lastname: Goel
authors.forename: Antonino B
authors.initials: AB
authors.lastname: D'Assoro
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Salisbury
authors.forename: Ralf
authors.initials: R
authors.lastname: Janknecht
mesh_terms: D000107:Acetylation; D017209:Apoptosis / Q000502:physiology*; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism; D002453:Cell Cycle / Q000502:physiology*; D053487:DEAD-box RNA Helicases / Q000235:genetics / Q000378:metabolism*; D047628:Estrogen Receptor alpha / Q000235:genetics / Q000378:metabolism; D005260:Female; D006367:HeLa Cells; D006801:Humans; D051736:Proto-Oncogene Proteins c-mdm2 / Q000235:genetics / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism; D050880:p300-CBP Transcription Factors / Q000235:genetics / Q000378:metabolism*; D000099224:p300-CBP-Associated Factor
chemical_list: D053487:DEAD-box RNA Helicases; D047628:Estrogen Receptor alpha; D051736:Proto-Oncogene Proteins c-mdm2; D016159:Tumor Suppressor Protein p53; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor; C495901:TP53 protein, human; C497206:MDM2 protein, human; C102004:DDX17 protein, human; C506749:Ddx5 protein, human