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Updated: Oct 8, 2025

Single-Molecule Dwell-Time Analysis of Restriction Endonuclease-Mediated DNA Cleavage
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Time-resolved structural analysis of an RNA-cleaving DNA catalyst.

Jan Borggräfe1,2, Julian Victor1, Hannah Rosenbach1

  • 1Institut für Physikalische Biologie, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

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Summary

The 10-23 DNAzyme, a potent RNA-cleaving DNA catalyst, shows therapeutic promise. New NMR studies reveal its catalytic mechanism, enabling rational design for enhanced DNAzyme performance.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The 10-23 DNAzyme is a catalytically active DNA sequence with significant therapeutic and biotechnological potential for RNA cleavage.
  • Despite its promise, a lack of high-resolution and time-resolved mechanistic information has hindered its full application.
  • Understanding the DNAzyme's mode of action is crucial for unlocking its potential.

Purpose of the Study:

  • To provide high-resolution NMR characterization of the 10-23 DNAzyme states.
  • To comprehensively survey the kinetics and dynamics of its catalytic function.
  • To elucidate the structural and dynamic basis of DNA-mediated catalysis.

Main Methods:

  • High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy to characterize DNAzyme states.
  • Real-time NMR measurements to identify transient intermediate states.
  • Kinetic and dynamic analyses of catalytic function.

Main Results:

  • Detailed NMR structures of the precatalytic DNAzyme-RNA complex reveal an unexpected molecular architecture, conformational plasticity, and metal ion modulation.
  • Previously hidden, rate-limiting transient intermediate states were identified during catalysis.
  • A single-atom replacement significantly enhanced DNAzyme performance.

Conclusions:

  • The catalytic mechanism of the 10-23 DNAzyme relies on a unique interplay of structure, plasticity, and metal ion dynamics.
  • Understanding these mechanistic details provides a foundation for designing improved DNAzymes.
  • This work paves the way for next-generation DNAzyme therapeutics and biotechnological tools.