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Related Experiment Videos

Interlocked mismatch-aligned arrowhead DNA motifs.

A Kettani1, S Bouaziz, E Skripkin

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

Structure (London, England : 1993)
|July 30, 1999
PubMed
Summary
This summary is machine-generated.

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Triplet repeat sequences, like d(GGA)n, can form disease-linked structures. We solved the structure of a d(GGA)2 DNA duplex, revealing a novel arrowhead motif stabilized by mismatched base pairs.

Area of Science:

  • Structural biology
  • Genetics
  • Biochemistry

Background:

  • Triplet repeat sequences (TRSs) are biologically significant, as their expansion causes human diseases.
  • TRSs can form higher-order structures through mismatch alignments, leading to replication issues and sequence expansion.
  • All-purine d(GGA)n sequences are of particular interest due to purine-specific mismatch alignments (G.G, A.A, G.A).

Purpose of the Study:

  • To determine the three-dimensional structure of the d(GGA)n triplet repeat sequence.
  • To investigate the structural basis of mismatch formation in purine-rich DNA sequences.
  • To understand how these structures may contribute to disease pathogenesis.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was used to solve the structure.

Related Experiment Videos

  • Uniform 13C,15N-labeling of the DNA sequence d(G1-G2-A3-G4-G5-A6-T7).
  • Structural analysis in 10 mM Na+ solution.

    • Main Results:

    • The d(GGA)2 sequence adopted a novel twofold-symmetric duplex fold.
    • Interlocked V-shaped arrowhead motifs were formed via interstrand G1.G4, G2.G5, and A3.A6 mismatch pairings.
    • Local parallel-stranded duplex domains were observed, centered around the A3-A6 step.

    Conclusions:

    • The arrowhead duplex motif in d(GGA)n sequences offers a unique scaffold for molecular recognition.
    • Key features include significant bending in sugar-phosphate backbones and segmental parallel-stranded alignments.
    • Exposed Watson-Crick edges of mismatched bases present potential sites for protein interactions.