Formaldehyde Cross-Linking-Assisted Phase Separation for Protein Aptamer Selection.

Area of Science:

• Biotechnology
• Molecular Biology
• Biochemistry

Background:

• Aptamers offer advantages like easy synthesis and high affinity for protein targeting in bioanalysis, diagnosis, and therapeutics.
• Current aptamer selection relies on bead-based solid-liquid separation, which can lead to nonspecific binding and reduced efficiency.

Purpose of the Study:

• To develop an improved technique for discovering and developing protein-targeting aptamers.
• To overcome the limitations of traditional bead-based selection methods, specifically nonspecific binding.

Main Methods:

• Developed and implemented an integrated technique combining formaldehyde cross-linking with phase separation (FCPS).
• Avoided the use of nano- or micro-beads in the aptamer selection process.
• Validated the technique by selecting aptamers targeting various antibodies.

Main Results:

• Demonstrated the feasibility and universality of the FCPS technique.
• Successfully selected two aptamers capable of targeting diverse antibodies.
• Achieved rapid aptamer generation in only one to three selection rounds, significantly faster than traditional methods.
• Showcased the potential of the selected aptamers in regulating antibody activity for biomedical applications.

Conclusions:

• The FCPS technique offers a bead-free, efficient, and rapid alternative for aptamer discovery and development.
• This method effectively minimizes nonspecific binding, enhancing selection efficiency.
• The selected aptamers hold promise for advanced applications in diagnostics, therapeutics, and antibody activity regulation.