title: The brain-specific actin-related protein ArpN alpha interacts with the transcriptional co-repressor CtBP.
abstract: Actin-related protein (Arp) is found in many chromatin remodeling and histone acetyltransferase complexes. We previously identified ArpN alpha as an isoform of ArpN beta/BAF53, which is included in mammalian SWI/SNF chromatin remodeling complex, and showed that ArpN alpha is a potential component of the complex. Although it has a structure highly similar to ArpN beta/BAF53, ArpN alpha is expressed exclusively in brain and in neural differentiated embryonal carcinoma cells. Since ArpN alpha possesses a region that shows low similarity to ArpN beta/BAF53, we hypothesized that proteins interacting with this region contribute to the ArpN alpha-specific function in brain. Here we showed that ArpN alpha, but not ArpN beta/BAF53, interacts with the transcriptional co-repressor CtBP (C-terminal binding protein). Transactivation by the SWI/SNF complex and glucocorticoid receptor was repressed by the CtBP in the presence of ArpN alpha. These findings suggest that SWI/SNF complex containing ArpN alpha might regulate certain genes involved in brain development and/or its function differently from SWI/SNF complex containing ArpN beta/BAF53.
authors.affiliation: Laboratory of Molecular Biology, Department of Molecular and Cell Biology, Division of Life Science, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-Amamiyamachi 1-1, Aoba-ku, Sendai 981-8555, Japan.
authors.forename: Yukako
authors.initials: Y
authors.lastname: Oma
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Nishimori
authors.forename: Masahiko
authors.initials: M
authors.lastname: Harata
mesh_terms: D000199:Actins / Q000737:chemistry / Q000378:metabolism; D000429:Alcohol Oxidoreductases; D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000378:metabolism* / Q000502:physiology; D019556:COS Cells; D002868:Chromosomal Proteins, Non-Histone / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D020033:Protein Isoforms / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D015533:Transcriptional Activation; D020798:Two-Hybrid System Techniques
chemical_list: C467332:ACTL6B protein, human; D000199:Actins; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D010750:Phosphoproteins; D020033:Protein Isoforms; D012097:Repressor Proteins; D014157:Transcription Factors; D000429:Alcohol Oxidoreductases; C096794:C-terminal binding protein