title: The crystal structure of a partial mouse Notch-1 ankyrin domain: repeats 4 through 7 preserve an ankyrin fold.
abstract: Folding and stability of proteins containing ankyrin repeats (ARs) is of great interest because they mediate numerous protein-protein interactions involved in a wide range of regulatory cellular processes. Notch, an ankyrin domain containing protein, signals by converting a transcriptional repression complex into an activation complex. The Notch ANK domain is essential for Notch function and contains seven ARs. Here, we present the 2.2 A crystal structure of ARs 4-7 from mouse Notch 1 (m1ANK). These C-terminal repeats were resistant to degradation during crystallization, and their secondary and tertiary structures are maintained in the absence of repeats 1-3. The crystallized fragment adopts a typical ankyrin fold including the poorly conserved seventh AR, as seen in the Drosophila Notch ANK domain (dANK). The structural preservation and stability of the C-terminal repeats shed a new light onto the mechanism of hetero-oligomeric assembly during Notch-mediated transcriptional activation.
authors.affiliation: Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
authors.forename: Olga Y
authors.initials: OY
authors.lastname: Lubman
authors.forename: Raphael
authors.initials: R
authors.lastname: Kopan
authors.forename: Gabriel
authors.initials: G
authors.lastname: Waksman
authors.forename: Sergey
authors.initials: S
authors.lastname: Korolev
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D018360:Crystallography, X-Ray; D051379:Mice; D008969:Molecular Sequence Data; D011487:Protein Conformation; D051881:Receptor, Notch1; D011956:Receptors, Cell Surface / Q000737:chemistry*; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000737:chemistry*
chemical_list: C497762:Notch1 protein, mouse; D051881:Receptor, Notch1; D011956:Receptors, Cell Surface; D014157:Transcription Factors