title: Conserved structure for single-stranded telomeric DNA recognition.
abstract: The essential Cdc13 protein in the yeast Saccharomyces cerevisiae is a single-stranded telomeric DNA binding protein required for chromosome end protection and telomere replication. Here we report the solution structure of the Cdc13 DNA binding domain in complex with telomeric DNA. The structure reveals the use of a single OB (oligonucleotide/oligosaccharide binding) fold augmented by an unusually large loop for DNA recognition. This OB fold is structurally similar to OB folds found in the ciliated protozoan telomere end-binding protein, although no sequence similarity is apparent between them. The common usage of an OB fold for telomeric DNA interaction demonstrates conservation of end-protection mechanisms among eukaryotes.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Rachel M
authors.initials: RM
authors.lastname: Mitton-Fry
authors.forename: Emily M
authors.initials: EM
authors.lastname: Anderson
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Hughes
authors.forename: Victoria
authors.initials: V
authors.lastname: Lundblad
authors.forename: Deborah S
authors.initials: DS
authors.lastname: Wuttke
mesh_terms: D001665:Binding Sites; D004271:DNA, Fungal / Q000737:chemistry / Q000378:metabolism*; D004277:DNA, Single-Stranded / Q000737:chemistry / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism; D008024:Ligands; D008958:Models, Molecular; D019906:Nuclear Magnetic Resonance, Biomolecular; D011485:Protein Binding; D011487:Protein Conformation; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000378:metabolism; D016615:Telomere / Q000378:metabolism*; D034501:Telomere-Binding Proteins
chemical_list: C452219:Cdc13 protein, S cerevisiae; D004271:DNA, Fungal; D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D008024:Ligands; D029701:Saccharomyces cerevisiae Proteins; D034501:Telomere-Binding Proteins