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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
Published on: April 12, 2019
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Redox-dependent control of i-Motif DNA structure using copper cations
Mahmoud As Abdelhamid1,2, László Fábián1, Colin J MacDonald1,3
1School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.
Nucleic Acids Research
|May 26, 2018
Summary
Copper cations (Cu+) can substitute for protons to form cytosine dimers, stabilizing the i-motif DNA structure. This effect is reversible, offering dynamic control over DNA conformation.
Area of Science:
- Biochemistry
- Molecular Biology
- DNA Structure
Background:
- Computational studies suggest Cu+ mimics H+ in forming cytosine dimers.
- Cytosine dimers are key to hemi-protonated base pairs in i-motif DNA.
Purpose of the Study:
- To provide experimental evidence for Cu+ mediating C-C base pairing in i-motif DNA.
- To investigate the role of Cu+ in preserving i-motif DNA structure.
- To develop a dynamic and redox-sensitive system for i-motif conformational control.
Main Methods:
- Biophysical methods (e.g., spectroscopy, calorimetry) were employed.
- Experimental validation of computational hypotheses.
- Investigation of copper cation (Cu+) interactions with DNA.
Main Results:
- Experimental evidence supports Cu+ mediating C-C base pairing in i-motif DNA.
- Cu+ stabilizes the i-motif DNA structure.
- The observed effects are reversible via metal chelation or oxidation of Cu+ to Cu2+.
Conclusions:
- Copper cations (Cu+) can act as effective mediators of cytosine-cytosine base pairing in i-motif DNA.
- A dynamic and redox-sensitive system for i-motif conformational control using copper cations is presented.
- This system offers potential for novel DNA-based applications.
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