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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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DNA Nanostructure Self-Assembly in an Aqueous Ionic Liquid Solution with Enhanced Stability and Target Binding

Dhanush Gandavadi1, Hannah Talbot2,3, Abhisek Dwivedy1,4

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This study shows that choline dihydrogen phosphate (CDHP) solution enhances DNA nanostructure stability and function. This ionic liquid method improves biostability and ligand binding for potential healthcare applications.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biochemistry

Background:

  • DNA nanostructures offer advanced disease diagnostics and therapeutics.
  • Maintaining structural integrity and function of DNA nanostructures is crucial for applications.
  • Ionic liquids are explored for their potential in biomolecular applications.

Purpose of the Study:

  • To investigate choline dihydrogen phosphate (CDHP) aqueous solution for DNA nanostructure assembly.
  • To assess the impact of CDHP on DNA nanostructure biostability and ligand binding affinity.
  • To explore CDHP as a one-pot preparation method for functional DNA nanostructures.

Main Methods:

  • DNA nanostructures were assembled in aqueous CDHP solution.
  • Formation was confirmed using gel electrophoresis, atomic force microscopy (AFM), and circular dichroism (CD).
  • Biostability was tested against DNase I and human serum; ligand binding affinity was assessed using flow cytometry and surface plasmon resonance.

Main Results:

  • Successful formation of DNA nanostructures in aqueous CDHP solution was achieved.
  • CDHP solution provided passive protection against DNase I and human serum for up to 48 hours.
  • Enhanced binding of aptamer-functionalized DNA nanostructures to acute myeloid leukemia (AML) cells was observed.

Conclusions:

  • Aqueous CDHP solution enhances DNA nanostructure biostability and ligand binding affinity.
  • The enhanced stability is attributed to both CDHP-mediated folding and the presence of free CDHP ions.
  • This method offers a robust, simpler, and faster alternative for preparing functional DNA nanostructures.