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Target Self-Enhanced Selectivity in Metal-Specific DNAzymes.

Po-Jung Jimmy Huang1, Donatien de Rochambeau2, Hanadi F Sleiman2

  • 1Department of Chemistry, Waterloo Institute for Nanotechnology University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.

Angewandte Chemie (International Ed. in English)
|December 24, 2019
PubMed
Summary

This study enhances metal ion selectivity using DNAzymes by increasing bound zinc ions (Zn2+). This binding-triggered catalysis approach significantly improves recognition accuracy for specific metal ions.

Keywords:
DNAzymesSELEXaptamersbiosensorsmetal ions

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Highly selective metal ion recognition is difficult due to nonspecific interactions.
  • Biological ligands often struggle with precise metal ion binding.
  • Catalysis triggered by metal ion binding offers a novel approach to enhance selectivity.

Purpose of the Study:

  • To develop highly selective metal ion sensors using DNAzymes.
  • To investigate the effect of increasing metal ion binding sites on selectivity.
  • To create DNAzymes with improved zinc ion (Zn2+) recognition.

Main Methods:

  • In vitro selection of RNA-cleaving DNAzymes.
  • Modification of DNAzyme cleavage junctions with glycyl-histidine-functionalized tertiary amines.
  • Assessing DNAzyme selectivity for Zn2+ over Co2+ with varying numbers of bound metal ions.

Main Results:

  • DNAzymes designed to bind 1, 2, and 3 Zn2+ ions showed increased selectivity.
  • Selectivity for Zn2+ over Co2+ improved from approximately 20-fold to 1000-fold, and then to 5000-fold.
  • A series of DNAzymes with excellent Zn2+ selectivity were generated.

Conclusions:

  • Combining rational ligand design and combinatorial selection enhances metal recognition.
  • Increasing the number of bound metal ions significantly boosts selectivity.
  • The developed DNAzymes offer a promising tool for precise Zn2+ detection.