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Metal ion coordination to azole nucleosides
Jens Müller1, Dominik Böhme, Patrick Lax
1Department of Chemistry, University of Dortmund, Germany. mueller@muellerlab.org
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 3, 2005
Summary
Azole nucleosides show potential for metal-mediated base pairs in artificial DNA. Imidazole and triazole nucleosides effectively complex with silver and mercury ions, enabling novel oligonucleotide designs.
Area of Science:
- Synthetic organic chemistry
- Supramolecular chemistry
- Biophysical chemistry
Background:
- Metal-mediated base pairs offer novel functionalities for artificial oligonucleotides.
- Azole nucleosides are explored as potential ligands for metal coordination.
Purpose of the Study:
- To synthesize and characterize imidazole, 1,2,4-triazole, and tetrazole nucleosides.
- To evaluate their ability to form metal complexes for artificial base pairs.
Main Methods:
- Synthesis and characterization of azole nucleosides.
- X-ray crystallography of protected nucleosides.
- Determination of pKa values and metal ion complexation stability (Ag+, Hg2+).
- Density Functional Theory (DFT) calculations.
Main Results:
- Nucleoside acidity and metal ion complexation ability correlate with nitrogen atom count.
- Imidazole nucleoside forms highly stable 2:1 complexes with Ag+ and Hg2+.
- 1,2,4-triazole nucleoside forms stable 2:1 complexes with Ag+.
- Tetrazole nucleoside does not form 2:1 complexes.
- DFT calculations suggest suitable glycosidic bond distances for B-DNA-like structures.
Conclusions:
- Imidazole and 1,2,4-triazole nucleosides are promising candidates for metal-mediated base pairs in artificial oligonucleotides.
- The coordination properties are tunable by the azole ring structure.
- This work lays the foundation for designing novel nucleic acid structures with unique properties.