Molecular simulation study of RNA/dopamine complex dynamics at varying concentrations.

Area of Science:

• Biochemistry
• Molecular Biology
• Computational Chemistry

Background:

• The interplay between neurotransmitters and nucleic acids is crucial for biological processes.
• RNA structures are increasingly recognized for their functional roles beyond genetic information storage.
• Understanding dopamine's interaction with RNA can advance biosensor technology.

Purpose of the Study:

• To investigate the binding mechanisms of dopamine to poly(rA)/poly(rU) complexes.
• To explore the influence of dopamine concentration on RNA structure and stability.
• To elucidate the role of molecular interactions in neurotransmitter-RNA complex formation.

Main Methods:

• All-atom molecular dynamics (MD) simulations were utilized.
• The concentration-dependent binding of dopamine to poly(rA)/poly(rU) was analyzed.
• Molecular configurations and binding modes were examined.

Main Results:

• Dopamine molecules preferentially bind to the poly(A)/poly(U) complex.
• Dopamine's catechol rings orient parallel to RNA amine rings.
• Increased dopamine concentration leads to dense packing and strong binding, with multi-mode configurations observed.
• Dopamine stabilizes the RNA complex via intercalation, driven by hydrogen bond network formation.

Conclusions:

• Dopamine significantly influences poly(A)/poly(U) complex structure and stability.
• The findings highlight an intercalation mechanism stabilized by hydrogen bonds.
• This research provides insights for RNA-based biosensor design and neurotransmitter-nucleic acid interactions.