ITC Measurement for High-Affinity Aptamers Binding to Their Target Proteins

Area of Science:

• Biochemistry
• Molecular Biology
• Biophysics

Background:

• Aptamers are nucleic acid ligands selected via SELEX for high affinity and specificity.
• Aptamers are being developed as therapeutic agents.
• The precise mechanism underlying aptamer binding affinity and specificity remains unclear.

Purpose of the Study:

• To elucidate the thermodynamic basis of aptamer-target protein interactions.
• To provide a protocol for studying aptamer-protein binding thermodynamics.
• To contribute to the therapeutic development of aptamers.

Main Methods:

• Isothermal titration calorimetry (ITC) is increasingly employed.
• ITC quantifies binding thermodynamics.
• Detailed protocol for aptamer-protein interaction thermodynamics is described.

Main Results:

• ITC provides insights into the thermodynamic underpinnings of aptamer binding.
• Understanding binding mechanisms is crucial for aptamer-based therapeutics.
• The study outlines a method to characterize these interactions.

Conclusions:

• Structural and biophysical studies, particularly ITC, are vital for understanding aptamer binding.
• Elucidating aptamer-target interactions facilitates their advancement as therapeutics.
• The described protocol aids in characterizing aptamer-protein thermodynamics.