title: Impaired repressor activity and biological functions of PU.1 in MEL cells induced by mutations in the acetylation motifs within the ETS domain.
abstract: PU.1, a hematopoietic Ets transcription factor, is required for development of the lymphoid and myeloid lineages. We have previously shown that PU.1 functions as both a transcriptional activator and repressor through complex formation with CBP/p300 and HDAC1/mSin3A/MeCP2, respectively. To determine whether modification of PU.1 is responsible for switching its association between co-activators and co-repressors, we examined whether acetylation regulates the physical and functional activities of PU.1. PU.1 was acetylated in vivo and its repressor activity was reduced when the putative acetylation motifs in the Ets domain were mutated. The mutant cooperated with CBP similar to wild type PU.1, but insufficiently with GATA-1 and mSin3A. Whereas overexpression of wild type PU.1 induced differentiation block, growth inhibition, and apoptotic cell death in MEL erythroleukemia cells as we reported previously, overexpression of the mutant-acetylation motif PU.1 did not. Taken together, our data suggest that acetylation might regulate the biological functions of PU.1 in erythroid cells.
authors.affiliation: Department of Cell Genetics, Sasaki Institute, 2-2 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
authors.forename: Fumiko
authors.initials: F
authors.lastname: Kihara-Negishi
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Suzuki
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Yamada
authors.forename: Takuya
authors.initials: T
authors.lastname: Sakurai
authors.forename: Tsuneyuki
authors.initials: T
authors.lastname: Oikawa
mesh_terms: D000107:Acetylation; D020816:Amino Acid Motifs; D000818:Animals; D017209:Apoptosis; D019556:COS Cells; D002454:Cell Differentiation; D002460:Cell Line; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000378:metabolism; D041905:Erythroid Cells / Q000166:cytology; D050981:Erythroid-Specific DNA-Binding Factors; D050982:GATA1 Transcription Factor; D005982:Glutathione Transferase / Q000378:metabolism; D006801:Humans; D047468:Immunoprecipitation; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D009154:Mutation; D010957:Plasmids / Q000378:metabolism; D017434:Protein Structure, Tertiary; D011518:Proto-Oncogene Proteins / Q000737:chemistry* / Q000378:metabolism; D012097:Repressor Proteins / Q000378:metabolism; D015682:Retroviridae Proteins, Oncogenic / Q000737:chemistry; D020133:Reverse Transcriptase Polymerase Chain Reaction; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D013997:Time Factors; D015534:Trans-Activators / Q000737:chemistry* / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism; D015533:Transcriptional Activation; D000099232:Proto-Oncogene Protein Spi-1
chemical_list: D004268:DNA-Binding Proteins; D050981:Erythroid-Specific DNA-Binding Factors; D050982:GATA1 Transcription Factor; D005982:Glutathione Transferase; D008156:Luciferases; D011518:Proto-Oncogene Proteins; D012097:Repressor Proteins; D015682:Retroviridae Proteins, Oncogenic; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D015534:Trans-Activators; D014157:Transcription Factors; D000099232:Proto-Oncogene Protein Spi-1; C494688:GATA1 protein, human; C494689:Gata1 protein, mouse; C099683:SIN3A transcription factor; C050379:oncogene proteins v-ets