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Rudimentary G-quadruplex-based telomere capping in Saccharomyces cerevisiae.

Telomere capping conceals chromosome ends from exonucleases and checkpoints, but the full range of capping mechanisms is not well defined. Telomeres have the potential to form G-quadruplex (G4) DNA, although evidence for telomere G4 DNA function in vivo is limited. In budding yeast, capping requires the Cdc13 protein and is lost at nonpermissive temperatures in cdc13-1 mutants. Here, we use several independent G4 DNA-stabilizing treatments to suppress cdc13-1 capping defects. These include overexpression of three different G4 DNA binding proteins, loss of the G4 DNA unwinding helicase Sgs1, or treatment with small molecule G4 DNA ligands. In vitro, we show that protein-bound G4 DNA at a 3' overhang inhibits 5'→3' resection of a paired strand by exonuclease I. These findings demonstrate that, at least in the absence of full natural capping, G4 DNA can play a positive role at telomeres in vivo.

Pubmed ID: 21399640

Authors

  • Smith JS
  • Chen Q
  • Yatsunyk LA
  • Nicoludis JM
  • Garcia MS
  • Kranaster R
  • Balasubramanian S
  • Monchaud D
  • Teulade-Fichou MP
  • Abramowitz L
  • Schultz DC
  • Johnson FB

Journal

Nature structural & molecular biology

Publication Data

April 6, 2011

Associated Grants

  • Agency: Cancer Research UK, Id: 11961
  • Agency: Cancer Research UK, Id: A5709
  • Agency: NIA NIH HHS, Id: P01 AG031862
  • Agency: NIA NIH HHS, Id: P01 AG031862
  • Agency: NIA NIH HHS, Id: P01 AG031862-02
  • Agency: NIA NIH HHS, Id: P01 AG031862-03
  • Agency: NIA NIH HHS, Id: R01 AG021521
  • Agency: NIA NIH HHS, Id: R01 AG021521
  • Agency: NIGMS NIH HHS, Id: T32 GM008216-22
  • Agency: NIGMS NIH HHS, Id: T32 GM07229
  • Agency: Cancer Research UK, Id:

Mesh Terms

  • Base Sequence
  • DNA Primers
  • G-Quadruplexes
  • Saccharomyces cerevisiae
  • Telomere