title: An RNA aptamer that binds to the beta-catenin interaction domain of TCF-1 protein.
abstract: The architectural transcription factor TCF-1 interacts directly with beta-catenin and activates transcription of various target genes that are important for early development and carcinogenesis. We selected an RNA aptamer that specifically bound to the beta-catenin-interacting N-terminal motif of TCF-1. Structural analysis revealed that it formed a stem-loop structure that was responsible for binding TCF-1 and contained a pair of internal loops. The RNA aptamer interfered with the binding of TCF-1 to beta-catenin and also inhibited the formation of TCF-1/beta-catenin complexes. Disruption of TCF-1/beta-catenin complexes could alter the transcriptional activity of TCF-1. Taken together our observations show that a rationally designed RNA aptamer can disrupt protein-protein interactions required for the formation of an active transcription complex.
authors.affiliation: Department of Molecular Biology, Institute of Nanosensor and Biotechnology, Dankook University, Seoul 140-714, Republic of Korea.
authors.forename: Su Kyung
authors.initials: SK
authors.lastname: Lee
authors.forename: Min Woo
authors.initials: MW
authors.lastname: Park
authors.forename: Eun Gyeong
authors.initials: EG
authors.lastname: Yang
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Yu
authors.forename: Sunjoo
authors.initials: S
authors.lastname: Jeong
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D051538:Hepatocyte Nuclear Factor 1-alpha; D051821:Lymphoid Enhancer-Binding Factor 1; D051379:Mice; D008969:Molecular Sequence Data; D046912:Multiprotein Complexes / Q000737:chemistry / Q000378:metabolism; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D012680:Sensitivity and Specificity; D051822:T Cell Transcription Factor 1; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D051176:beta Catenin
chemical_list: C495267:CTNNB1 protein, mouse; D003598:Cytoskeletal Proteins; D004268:DNA-Binding Proteins; D051538:Hepatocyte Nuclear Factor 1-alpha; C496488:Hnf1a protein, mouse; D051821:Lymphoid Enhancer-Binding Factor 1; D046912:Multiprotein Complexes; D051822:T Cell Transcription Factor 1; D015534:Trans-Activators; D014157:Transcription Factors; D051176:beta Catenin; D012313:RNA