title: Modulation of YY1 activity by SAP30.
abstract: Yin Yang 1 (YY1) is a highly conserved and multifunctional transcription factor. The diverse activities of YY1 are regulated and sometimes modified by interaction with various other proteins. By using a yeast two-hybrid screening system, SAP30 was identified as a protein that associates with YY1 and it is able to enhance YY1-mediated repression in a dose-dependent manner. SAP30 is a 30kDa nuclear protein and is a component of the human histone deacetylase complex. In this study, the interaction of SAP30 and YY1 was confirmed both by in vitro and in vivo assays. The interaction domains between YY1 and SAP30 were mapped to the C-terminal segment of YY1 (295-414) and the C-terminal 91 amino acid region of SAP30. The observation that YY1, SAP30, and HDAC1 form a complex in vivo provides evidence that YY1 also recruits HDAC1 indirectly via its binding to SAP30. These results describe a novel mechanism for YY1-mediated repression.
authors.affiliation: Graduate Institute of Life Sciences, National Defense Medical Center, ROC, Taipei, Taiwan.
authors.forename: Nu En
authors.initials: NE
authors.lastname: Huang
authors.forename: Ching Hui
authors.initials: CH
authors.lastname: Lin
authors.forename: Young Sun
authors.initials: YS
authors.lastname: Lin
authors.forename: Winston C Y
authors.initials: WC
authors.lastname: Yu
mesh_terms: D001665:Binding Sites; D050981:Erythroid-Specific DNA-Binding Factors; D006367:HeLa Cells; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D046911:Macromolecular Substances; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D020798:Two-Hybrid System Techniques; D050986:YY1 Transcription Factor; D016335:Zinc Fingers
chemical_list: D050981:Erythroid-Specific DNA-Binding Factors; D046911:Macromolecular Substances; D011994:Recombinant Proteins; D012097:Repressor Proteins; C113294:SAP30 protein, human; D014157:Transcription Factors; D050986:YY1 Transcription Factor; C494698:YY1 protein, human; C110550:HDAC1 protein, human; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases