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Bombyx mori single repeat telomeric DNA sequence forms a G-quadruplex capped by base triads

A Kettani1, S Bouaziz, W Wang

  • 1Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.

Nature Structural Biology
|May 1, 1997
PubMed
Summary

Researchers determined the structure of a Bombyx mori telomeric DNA quadruplex. This study experimentally verifies novel (T.A).A base triads, advancing understanding of multi-stranded DNA structures.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Genetics

Background:

  • Telomeric DNA sequences play crucial roles in chromosome stability.
  • G-quadruplex structures are increasingly recognized for their biological significance.
  • Understanding DNA structures is vital for comprehending genetic processes.

Purpose of the Study:

  • To elucidate the solution structure of a truncated Bombyx mori telomeric DNA sequence.
  • To experimentally verify the existence and formation of novel (T.A).A base triads.
  • To explore the implications of this structure for multi-stranded DNA alignments.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was combined with molecular dynamics simulations.
  • The study focused on a truncated d(TTAGG) single repeat analogue in a Na+ solution.

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  • Structural analysis involved identifying base-pairing arrangements and strand orientations.

    • Main Results:

    • A two-fold symmetric, four-stranded d(TAGG) quadruplex structure was determined.
    • Two adjacent G-tetrads were found to be sandwiched between novel (T.A).A triads.
    • The (T.A).A triad, formed by an A residue in the minor groove of a T.A base pair, was experimentally verified.
    • Individual DNA strands exhibited both parallel and antiparallel orientations.

    Conclusions:

    • The study provides the first experimental evidence for the (T.A).A base triad alignment, supporting the triad-DNA model.
    • The novel quadruplex architecture highlights potential for new base tetrads and triads in DNA.
    • Findings advance the understanding of multi-stranded DNA structures involved in chromosome association and genetic recombination.