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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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Monovalent cation size and DNA conformational stability.

Earle Stellwagen¹, Joseph M Muse, Nancy C Stellwagen

¹Department of Biochemistry, University of Iowa, Iowa City, Iowa 52242, United States.

|March 18, 2011

Summary

Monovalent cations affect DNA hairpin stability, with melting temperature increasing with smaller, less hydrophobic ions like Li+ and decreasing with larger, hydrophobic ions like TBA+. This is due to cation size influencing charge shielding on DNA.

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Published on: August 2, 2012

Area of Science:

Biochemistry
Molecular Biology
Physical Chemistry

Background:

DNA thermal stability is crucial for understanding DNA structure and function.
Monovalent cations are known to influence the stability of DNA structures.
The specific effects of various monovalent cations, particularly alkylammonium ions, on DNA hairpin stability require further elucidation.

Purpose of the Study:

To investigate the impact of different monovalent cations on the thermal stability of a model DNA hairpin.
To correlate cation properties, such as size and hydrophobicity, with their effects on DNA hairpin melting temperature.
To elucidate the mechanisms by which cations stabilize or destabilize DNA hairpin structures.

Main Methods:

Capillary electrophoresis was employed to measure the melting temperature (Tm) of a model DNA hairpin.
A 16-thymine residue oligomer was used as an unstructured control.
Studies were conducted across a range of cation concentrations and types, including Na+, K+, Li+, NH4+, Tris+, TMA+, TEA+, TPA+, and TBA+.

Main Results:

Melting temperature increased with cation concentration for Li+, Na+, K+, NH4+, Tris+, TMA+, and TEA+.
Melting temperature was independent of concentration for TPA+ and decreased with concentration for TBA+.
At constant concentration, Tm decreased with increasing cation hydrophobicity in the order: Li+ ∼ Na+ ∼ K+ > NH4+ > TMA+ > Tris+ > TEA+ > TPA+ > TBA+.

Conclusions:

Cation size, rather than specific binding, is the primary determinant of DNA hairpin thermal stability.
Larger cations are less effective at shielding charged phosphate residues in B-form DNA due to their inability to approach the backbone closely.
Hydrophobic interactions and cation size significantly influence DNA thermal stability, particularly in random coil conformations.