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Related Experiment Videos

Human telomeric C-strand tetraplexes

S Ahmed1, A Kintanar, E Henderson

  • 1Department of Zoology and Genetics, Iowa State University, Ames 50011, USA.

Nature Structural Biology
|February 1, 1994
PubMed
Summary
This summary is machine-generated.

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Human telomeric C-strand sequences form i-motif structures at low pH. These DNA structures, composed of stacked C-rich duplexes, may play a role in nucleic acid self-recognition.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Telomeric DNA sequences are crucial for chromosome stability.
  • Non-canonical DNA structures, such as quadruplexes, can form in telomeric regions.
  • The C-strand of telomeric DNA (d(CCCTAA)n) can adopt unusual conformations.

Purpose of the Study:

  • To investigate the structural properties of human telomeric C-strand oligonucleotides at low pH.
  • To characterize the formation and nature of non-Watson-Crick base-paired structures in C-rich sequences.
  • To explore the potential biological relevance of these structures.

Main Methods:

  • Synthesis of 2- and 4-repeat human telomeric C-strand oligonucleotides (d(CCCTAA)n).
  • Nuclear Magnetic Resonance (NMR) spectroscopy to analyze DNA structure.

Related Experiment Videos

  • Nuclear Overhauser Effect (NOE) experiments to identify base-pairing interactions.

    • Main Results:

    • At low pH, the 2-repeat d(CCCTAA)n molecule forms a dimeric i-motif structure.
    • The i-motif is characterized by intercalated C-rich duplexes with stacked CC+ base pairs.
    • The 4-repeat d(CCCTAA)n molecule forms an intramolecular monomeric i-motif structure at low pH.

    Conclusions:

    • Human telomeric C-strand sequences can form i-motif tetraplexes at acidic pH.
    • These i-motif structures involve two intercalated duplexes formed by CC+ base pairs.
    • The findings suggest a potential mechanism for DNA self-recognition and may relate to guanine tetraplex formation.