title: The Krüppel-like zinc-finger protein ZNF224 represses aldolase A gene transcription by interacting with the KAP-1 co-repressor protein.
abstract: Transcription factors belonging to the Krüppel-like zinc finger family of proteins participate in the regulation of cell differentiation and development. Although many of these proteins have been identified, little is known about their structure and function. We recently purified ZNF224, a new Krüppel-like zinc finger protein, that contains a Krüppel-associated box (KRAB) domain at the NH2 terminus, and 19 Cys2-His2 zinc-finger domains at the COOH terminus. Using chromatin immunoprecipitation and transient transfection assays, we demonstrate that ZNF224 binds in vivo to the distal promoter of the aldolase A gene and represses its transcription. The results of transient co-transfection experiments show that ZNF224-mediated transcription repression requires the 45-amino acid long KRAB A domain. The ability of KRAB-containing ZNF224 protein to repress transcription depends on specific interaction with the KAP-1 co-repressor molecule. Finally, using selective treatment with the HDAC1 inhibitor trichostatin A, we demonstrate that ZNF224-mediated repression requires histone deacetylases.
authors.affiliation: Dipartimento di Biochimica e Biotecnologie Mediche, Università di Napoli Federico II, Via S. Pansini 5, 80131 Napoli, Italy.
authors.forename: Lina
authors.initials: L
authors.lastname: Medugno
authors.forename: Francesca
authors.initials: F
authors.lastname: Florio
authors.forename: Rossella
authors.initials: R
authors.lastname: De Cegli
authors.forename: Michela
authors.initials: M
authors.lastname: Grosso
authors.forename: Angelo
authors.initials: A
authors.lastname: Lupo
authors.forename: Paola
authors.initials: P
authors.lastname: Costanzo
authors.forename: Paola
authors.initials: P
authors.lastname: Izzo
mesh_terms: D000107:Acetylation; D000818:Animals; D001665:Binding Sites / Q000235:genetics; D019556:COS Cells; D002460:Cell Line; D002522:Chlorocebus aethiops; D047369:Chromatin Immunoprecipitation; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005634:Fructose-Bisphosphate Aldolase / Q000235:genetics*; D015870:Gene Expression / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases / Q000378:metabolism; D006657:Histones / Q000378:metabolism; D006801:Humans; D006877:Hydroxamic Acids / Q000494:pharmacology; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects / Q000235:genetics*; D014162:Transfection; D000076183:Tripartite Motif-Containing Protein 28; D016335:Zinc Fingers / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D056572:Histone Deacetylase Inhibitors; D006657:Histones; D006877:Hydroxamic Acids; D012097:Repressor Proteins; C470003:ZNF224 protein, human; C012589:trichostatin A; C101116:TRIM28 protein, human; D000076183:Tripartite Motif-Containing Protein 28; D006655:Histone Deacetylases; D005634:Fructose-Bisphosphate Aldolase