title: Specific recognition of ZNF217 and other zinc finger proteins at a surface groove of C-terminal binding proteins.
abstract: Numerous transcription factors recruit C-terminal binding protein (CtBP) corepressors. We show that the large zinc finger protein ZNF217 contacts CtBP. ZNF217 is encoded by an oncogene frequently amplified in tumors. ZNF217 contains a typical Pro-X-Asp-Leu-Ser (PXDLS) motif that binds in CtBP's PXDLS-binding cleft. However, ZNF217 also contains a second motif, Arg-Arg-Thr (RRT), that binds a separate surface on CtBP. The crystal structure of CtBP bound to an RRTGAPPAL peptide shows that it contacts a surface crevice distinct from the PXDLS binding cleft. Interestingly, both PXDLS and RRT motifs are also found in other zinc finger proteins, such as RIZ. Finally, we show that ZNF217 represses several promoters, including one from a known CtBP target gene, and mutations preventing ZNF217's contact with CtBP reduce repression. These results identify a new CtBP interaction motif and establish ZNF217 as a transcriptional repressor protein that functions, at least in part, by associating with CtBP.
authors.affiliation: School of Molecular and Microbial Biosciences, University of Sydney, Sydney, NSW 2006, Australia.
authors.forename: Kate G R
authors.initials: KG
authors.lastname: Quinlan
authors.forename: Marco
authors.initials: M
authors.lastname: Nardini
authors.forename: Alexis
authors.initials: A
authors.lastname: Verger
authors.forename: Pierangelo
authors.initials: P
authors.lastname: Francescato
authors.forename: Paul
authors.initials: P
authors.lastname: Yaswen
authors.forename: Daniela
authors.initials: D
authors.lastname: Corda
authors.forename: Martino
authors.initials: M
authors.lastname: Bolognesi
authors.forename: Merlin
authors.initials: M
authors.lastname: Crossley
mesh_terms: D000429:Alcohol Oxidoreductases; D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D056970:Co-Repressor Proteins; D018360:Crystallography, X-Ray; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D009363:Neoplasm Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D010750:Phosphoproteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D011487:Protein Conformation; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D020798:Two-Hybrid System Techniques; D016335:Zinc Fingers
chemical_list: D056970:Co-Repressor Proteins; D004268:DNA-Binding Proteins; D009363:Neoplasm Proteins; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D015534:Trans-Activators; C113698:ZNF217 protein, human; D000429:Alcohol Oxidoreductases; C111341:Ctbp2 protein, mouse