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Lanthanide ions induce DNA compaction with ionic specificity.

Xin-Min Ru1, Zi-Yang Yang1, Shi-Yong Ran1

  • 1Department of Physics, Wenzhou University, Wenzhou 325035, China.

International Journal of Biological Macromolecules
|May 9, 2022
PubMed
Summary
This summary is machine-generated.

Lanthanide ions like Ho³⁺ can compact DNA at the single-molecule level, showing specific binding affinities. This DNA compaction is concentration and force-dependent, with Ho³⁺ being the most effective.

Keywords:
DNADynamicsLanthanide ions

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Area of Science:

  • Biophysical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Lanthanide (Ln) cations possess unique properties enabling interactions with DNA, forming metal-DNA complexes.
  • These complexes are significant in medical, biological, and nano-technological applications.
  • The precise dynamics of lanthanide ion-DNA interactions remain incompletely understood.

Purpose of the Study:

  • To investigate the dynamics of lanthanide ion (Ln³⁺)-DNA interactions at the single-molecule level.
  • To explore the influence of different lanthanide ions on DNA structure and compaction.
  • To determine the ionic specificity and binding affinity of various lanthanides to DNA.

Main Methods:

  • Formation of DNA-metal complexes using five lanthanide ions: La³⁺, Ce³⁺, Pr³⁺, Tb³⁺, and Ho³⁺.
  • Single-molecule force spectroscopy to study binding dynamics and DNA compaction.
  • Morphological characterization to verify compaction effects.
  • DNA length restoration studies using EDTA to assess binding affinity.

Main Results:

  • Lanthanide cations induce DNA compaction in a concentration- and force-dependent manner.
  • Significant ionic specificity was observed, with Holmium (Ho³⁺) demonstrating the highest efficiency in DNA compaction.
  • DNA molecules restored to their original length at varying speeds upon EDTA addition, confirming Ho³⁺'s strongest affinity.

Conclusions:

  • Lanthanide ions exhibit specific interactions with DNA, leading to ion-dependent compaction.
  • Counterion correlation alone cannot fully explain the observed DNA compaction phenomena.
  • Ionic specificity plays a crucial role in lanthanide-DNA interactions and should be considered significant.