title: Histone deacetylase associated with mSin3A mediates repression by the acute promyelocytic leukemia-associated PLZF protein.
abstract: The PLZF gene was identified first by its fusion with the retinoic acid receptor alpha gene in the t(11;17) translocation associated with a retinoic acid resistant form of acute promyelocytic leukemia (APL). It encodes a krüppel-like zinc finger protein with a POZ domain shared with a subset of regulatory proteins including the BCL6 leukemogenic protein. PLZF, like BCL6, strongly represses transcription initiated from different promoters. Here we show that PLZF associates in vitro and in vivo with the Mad co-repressor mSin3A and the histone deacetylase HDAC1. Two domains in PLZF and the PAH1 structure of mSin3A mediate these interactions. Trichostatin A, a specific inhibitor of histone deacetylases, significantly reduces PLZF repression. These data strongly suggest that, like nuclear receptors and Mad, PLZF represses transcription by recruiting a histone deacetylase through the SMRT-mSin3-HDAC co-repressor complex. We also show that BCL6 associates with HDAC1 indicating that this type of regulation might be common to POZ/Zinc finger proteins involved in human leukemias. This work supports a role for deregulated histone deacetylation in the development of both lymphoid and myeloid neoplasia in human and suggests that targeted histone deacetylase inhibitors may be useful for treatment of certain types of malignancies.
authors.affiliation: Unité de Recombinaison et Expression Génétique, INSERM U163, Institut Pasteur, Paris, France.
authors.forename: G
authors.initials: G
authors.lastname: David
authors.forename: L
authors.initials: L
authors.lastname: Alland
authors.forename: S H
authors.initials: SH
authors.lastname: Hong
authors.forename: C W
authors.initials: CW
authors.lastname: Wong
authors.forename: R A
authors.initials: RA
authors.lastname: DePinho
authors.forename: A
authors.initials: A
authors.lastname: Dejean
mesh_terms: D001665:Binding Sites; D002461:Cell Line, Transformed; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases / Q000378:metabolism*; D006801:Humans; D051741:Kruppel-Like Transcription Factors; D000075722:Promyelocytic Leukemia Zinc Finger Protein; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000378:metabolism*; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D016335:Zinc Fingers
chemical_list: D004268:DNA-Binding Proteins; D051741:Kruppel-Like Transcription Factors; D000075722:Promyelocytic Leukemia Zinc Finger Protein; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; C099683:SIN3A transcription factor; D014157:Transcription Factors; C092037:ZBTB16 protein, human; C110550:HDAC1 protein, human; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases; D056264:Sin3 Histone Deacetylase and Corepressor Complex