title: A novel Krüppel-Associated Box identified in a panel of mammalian zinc finger proteins.
abstract: Krüppel-related zinc finger proteins probably constitute the largest individual family of transcription factors in mammals. These proteins often carry a potent repressor domain called the Krüppel Associated Box (KRAB), which is known to effectively repress transcription through interaction with transcriptional intermediary factor 1beta (TIF1beta). Here we report the isolation and characterization of a novel human KRAB A zinc finger protein, HZF12. The gene encoding HZF12 is located on Chromosome (Chr) 19p13.11-p12, and a 4.4-kb transcript from this gene is expressed in a variety of adult and fetal tissues. Two additional, larger transcripts are expressed in testis only. Interestingly, the KRAB A domain of HZF12 is followed by a 21-amino acid domain, encoded by a separate exon. This domain, which we designate KRAB C, was also identified in more than 25 additional human, mouse, and rat KRAB zinc finger proteins. On the basis of results from a previous study, we conclude that this novel KRAB domain strengthens the interaction with TIF1beta, thereby improving the ability of these KRAB zinc finger proteins to recruit TIF1beta to specific sites.
authors.affiliation: Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden.
authors.forename: Camilla
authors.initials: C
authors.lastname: Looman
authors.forename: Lars
authors.initials: L
authors.lastname: Hellman
authors.forename: Magnus
authors.initials: M
authors.lastname: Abrink
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002888:Chromosomes, Human, Pair 19 / Q000235:genetics; D003001:Cloning, Molecular; D016384:Consensus Sequence; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D015723:Gene Library; D006801:Humans; D051741:Kruppel-Like Transcription Factors; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins; D020033:Protein Isoforms; D017434:Protein Structure, Tertiary; D051381:Rats; D012097:Repressor Proteins / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D013737:Testis; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D000076183:Tripartite Motif-Containing Protein 28; D016335:Zinc Fingers / Q000502:physiology*
chemical_list: D004268:DNA-Binding Proteins; D051741:Kruppel-Like Transcription Factors; D009687:Nuclear Proteins; D020033:Protein Isoforms; D012097:Repressor Proteins; D014157:Transcription Factors; C497245:ZNF101 protein, human; C101116:TRIM28 protein, human; C103190:Trim28 protein, mouse; C486304:Trim28 protein, rat; D000076183:Tripartite Motif-Containing Protein 28