All-Atom Simulations Elucidate the Molecular Mechanism Underlying RNA-Membrane Interactions

Area of Science:

• Biophysics
• Molecular Biology
• Biochemistry

Background:

• RNA molecules are increasingly recognized for their roles in cellular organization and intercellular signaling.
• Extracellular RNA localization and its influence on lipid-based delivery systems are areas of active research.
• The molecular mechanisms governing RNA-membrane interactions are not well understood.

Purpose of the Study:

• To investigate the molecular determinants of RNA binding to phospholipid membranes.
• To elucidate the role of RNA structure and specific nucleobases in membrane association.
• To provide insights for improving RNA-based therapeutics and delivery systems.

Main Methods:

• All-atom molecular dynamics simulations were employed to study RNA-phospholipid membrane interactions.
• Free energy calculations were performed to quantify binding affinities.
• The influence of intra-RNA base pairing on membrane association was assessed.

Main Results:

• Guanine demonstrated the most favorable binding free energy among RNA nucleobases, attributed to extensive hydrogen bonding.
• Intra-RNA base pairing within structured RNA significantly reduced RNA-membrane binding affinity.
• Specific RNA-membrane interaction mechanisms were identified at the molecular level.

Conclusions:

• Understanding RNA-membrane interactions is crucial for advancing RNA-based drug design and delivery technologies.
• Guanine's strong membrane affinity and the inhibitory effect of RNA structure offer key insights.
• This research contributes to deciphering RNA transport and localization mechanisms within biological systems.