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A Flexible Quadruple-Stranded Helicate Demonstrates a Strong Binding Preference for DNA Three-Way Junctions by

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A novel platinum helicate preferentially binds three-way DNA junctions (3WJs) over four-way DNA junctions (4WJs). This finding highlights the critical role of size and induced fit in designing DNA-binding molecules.

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Area of Science:

  • Supramolecular Chemistry
  • Biophysical Chemistry
  • Structural Biology

Background:

  • Nucleic acid junctions are vital for DNA recombination, repair, and viral insertion.
  • Designing molecules that bind these junctions is crucial for therapeutic and diagnostic applications.
  • Understanding the interplay between molecular shape, size, and binding affinity is key.

Purpose of the Study:

  • To investigate the binding preferences of a quadruple-stranded diplatinum helicate towards three-way (3WJ) and four-way DNA junctions (4WJ).
  • To elucidate the relative importance of size and shape in the design of junction-binding molecules.
  • To explore novel binding mechanisms beyond the traditional lock-and-key model.

Main Methods:

  • Microscale thermophoresis (MST) to determine binding affinities.
  • Isothermal titration calorimetry (ITC) for thermodynamic analysis.
  • Gel electrophoresis competition assays to assess binding selectivity.
  • Molecular dynamics simulations to visualize binding interactions and conformational changes.

Main Results:

  • The diplatinum helicate exhibits a significantly higher affinity for 3WJs (Kd = 12 nM) compared to 4WJs (Kd > 4 μM).
  • Molecular dynamics simulations reveal that the helicate's size, rather than its shape, dictates its preference, being unable to fully engage with the larger 4WJ.
  • The helicate induces conformational changes in the 3WJ, disrupting a base pair to accommodate its size, demonstrating an induced-fit binding mechanism.

Conclusions:

  • Size is a more critical determinant than shape for this helicate's DNA junction binding.
  • The observed induced-fit mechanism offers a new paradigm for designing DNA/RNA-binding compounds, moving beyond static lock-and-key interactions.
  • This study opens avenues for developing targeted therapies and molecular tools based on flexible, adaptive binding strategies.