Energy Transfer as A Driving Force in Nucleic Acid⁻Protein Interactions

Area of Science:

• Biochemistry
• Structural Biology
• Biophysics

Background:

• Quantitative structure-activity relationships for nucleic acid-protein complexes are often unclear.
• Thrombin-G-quadruplex aptamer complexes exemplify poor correlation between affinity and interface organization.

Purpose of the Study:

• To test the hypothesis that aptamer-protein complex affinity is determined by the interface's capacity for energy dissipation.
• To identify key structural features correlating with high-affinity nucleic acid-protein interactions.

Main Methods:

• Analysis of 63 nucleic acid-protein structures.
• Correlation of interface parameters with binding affinity.
• Application of energy dissipation theory.

Main Results:

• Amino acid sidechain size in the interface is the most significant parameter correlating with aptamer affinity.
• Efficient energy transfer from interacting residues is crucial for high affinity.
• Energy dissipation theory provides a tool to estimate aptamer-protein complex efficiency.

Conclusions:

• Aptamer-protein complex affinity is strongly linked to the interface's energy dissipation capacity.
• Amino acid sidechain size is a critical determinant of aptamer binding affinity.
• These findings are vital for the rational design of high-affinity aptamers.