A computational study of the interaction between dopamine and DNA/RNA nucleosides

Area of Science:

• Computational chemistry
• Molecular interactions
• Biophysics

Background:

• Dopamine is a crucial neurotransmitter.
• Nucleosides are fundamental building blocks of nucleic acids (RNA and DNA).
• Understanding interactions between small molecules and nucleic acids is vital in molecular biology and pharmacology.

Purpose of the Study:

• To investigate the interactions between protonated dopamine and neutral RNA and DNA nucleosides.
• To analyze the electronic and spectral properties of these complexes.
• To determine the most stable complex and its specific spectral modifications.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• Simulations were performed in both vacuum and implicit water environments.
• Vertical absorption excitation energies were calculated for stable complexes.

Main Results:

• The most stable complex was identified between protonated dopamine and guanosine.
• Significant spectral changes were observed in the dopamine-guanosine complex.
• A notable reduction in the oscillator strength of dopamine's first transition was found.
• Guanosine's first transition exhibited a 0.2 eV redshift and reduced oscillator strength.

Conclusions:

• Protonated dopamine forms stable complexes with nucleosides, particularly guanosine.
• These interactions lead to measurable alterations in the electronic absorption spectra.
• The findings provide insights into potential molecular recognition mechanisms and spectral properties relevant to biological systems.