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Updated: Jul 15, 2026

Studying DNA Looping by Single-Molecule FRET

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

B-DNA helix stability in a solvent-free environment.

Erin Shammel Baker¹, Michael T Bowers

¹Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, USA.

Journal of the American Society for Mass Spectrometry

|April 17, 2007

Summary

In solvent-free conditions, smaller DNA helices (shorter base pairs) more readily adopt the A-form conformation than larger ones. Poly d(CG)(n) sequences show greater A-philicity compared to mixed sequences.

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Area of Science:

Molecular Biology
Biophysics
Structural Biology

Background:

B-DNA is the standard helix conformation under physiological conditions.
Decreased water content can induce B-to-A helix transitions in DNA.
Understanding DNA structure in solvent-free environments is crucial.

Purpose of the Study:

To investigate DNA helix conformations in solvent-free environments.
To examine the influence of sequence and size on DNA structure.
To compare the A-philicity of different DNA sequences.

Main Methods:

Circular dichroism (CD) spectroscopy.
Electrospray ionization mass spectrometry (ESI-MS).
Ion mobility and molecular dynamics simulations.

Main Results:

All DNA sequences adopted B-form helices in solution.
In solvent-free conditions, smaller poly d(CG)(n) duplexes (18 bp) favored A-form, while larger ones (26-30 bp) remained B-form.
Mixed sequence duplexes showed similar trends, with 18 bp favoring A-form and larger ones B-form.
Poly d(CG)(n) duplexes exhibited greater A-philicity than mixed sequences.

Conclusions:

DNA helix conformation is sensitive to solvent availability and duplex size.
Smaller DNA duplexes are more prone to B-to-A transitions in the absence of solvent.
Sequence composition, specifically poly d(CG)(n) versus mixed sequences, influences A-philicity.