Chinese Science Bulletin

, Volume 45, Issue 21, pp 1959–1963 | Cite as

Circular dichroism spectroscopic studies on structures formed by telomeric DNA sequencesin vitro

  • Xiaoyan Zhang
  • Enhua Cao
  • Xueguang Sun
  • Chunli Bai


Telomere plays an important role in cellular processes, such as cell aging, death and carcinogenisis. Having special sequences, it can form quadruplex structurein vitro. Circular dichroism (CD) spectroscopic studies show that TTAGGG, (TTAGGG)2 and (TTAGGG)4 can all form quadruplexin vitro and exist mainly as parallel quadruplex without metal ions. Both K+ and Na+ can stabilize the tetrameric structure and facilitate the forming of anti-parallel conformation. Furthermore, the conformations of quadruplex can also be affected by sequence length, the nature and concentration of metal ions.


human telomere quadruplex conformation CD spectrum K+ Na+ cation concentration 


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Copyright information

© Science in China Press 2000

Authors and Affiliations

  • Xiaoyan Zhang
    • 1
  • Enhua Cao
    • 1
  • Xueguang Sun
    • 1
  • Chunli Bai
    • 2
  1. 1.Institute of BiophysicsChinese Academy of SciencesBeijingChina
  2. 2.Institute of ChemistryChinese Academy of SciencesBeijingChina

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