title: Three-dimensional structure of the armadillo repeat region of beta-catenin.
abstract: Beta-catenin is essential for cadherin-based cell adhesion and Wnt/Wingless growth factor signaling. In these roles, it binds to cadherins, Tcf-family transcription factors, and the tumor suppressor gene product Adenomatous Polyposis Coli (APC). A core region of beta-catenin, composed of 12 copies of a 42 amino acid sequence motif known as an armadillo repeat, mediates these interactions. The three-dimensional structure of a protease-resistant fragment of beta-catenin containing the armadillo repeat region has been determined. The 12 repeats form a superhelix of helices that features a long, positively charged groove. Although unrelated in sequence, the beta-catenin binding regions of cadherins, Tcfs, and APC are acidic and are proposed to interact with this groove.
authors.affiliation: Department of Structural Biology, Stanford University School of Medicine, California 94305, USA.
authors.forename: A H
authors.initials: AH
authors.lastname: Huber
authors.forename: W J
authors.initials: WJ
authors.lastname: Nelson
authors.forename: W I
authors.initials: WI
authors.lastname: Weis
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D051186:Armadillo Domain Proteins; D001665:Binding Sites; D015820:Cadherins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D003598:Cytoskeletal Proteins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D029721:Drosophila Proteins; D019476:Insect Proteins / Q000737:chemistry; D051379:Mice; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D012091:Repetitive Sequences, Nucleic Acid; D015534:Trans-Activators; D051176:beta Catenin
chemical_list: D051186:Armadillo Domain Proteins; C495267:CTNNB1 protein, mouse; D015820:Cadherins; D003598:Cytoskeletal Proteins; D029721:Drosophila Proteins; D019476:Insect Proteins; D015534:Trans-Activators; D051176:beta Catenin