Normal coordinate analysis of 2'-deoxythymidine and 2'-deoxyadenosine

Area of Science:

• Molecular Spectroscopy
• Computational Chemistry
• Biophysics

Background:

• Understanding molecular vibrations is crucial for characterizing biomolecules.
• Accurate force fields are essential for predicting molecular behavior and interactions.
• Nucleosides like 2 -deoxyadenosine and 2 -deoxythymidine are fundamental DNA building blocks.

Purpose of the Study:

• To develop and validate a novel valence force field for nucleosides.
• To accurately reproduce and assign vibrational modes of 2 -deoxythymidine and 2 -deoxyadenosine.
• To apply the force field to understand vibrations within DNA double helices.

Main Methods:

• Utilized the Wilson GF-method for vibrational analysis.
• Employed a non-redundant set of symmetrical coordinates for calculations.
• Compared calculated wavenumbers with experimental Raman and infrared spectroscopy data.

Main Results:

• Successfully reproduced vibration modes for 2 -deoxythymidine and 2 -deoxyadenosine.
• Validated calculations against experimental data from solid, amorphous, and aqueous samples.
• Assigned characteristic vibration modes for thymidine and adenosine residues in DNA.

Conclusions:

• The proposed valence force field is effective for studying nucleoside vibrations.
• This method provides insights into the vibrational dynamics of DNA structures.
• The validated force field can be a valuable tool for further molecular modeling studies.