Automated ssDNA SELEX Using Histidine-Tagged Target Proteins

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Systematic evolution of ligands by exponential enrichment (SELEX) is a powerful method for identifying high-affinity nucleic acid ligands.
• Specific DNA or RNA sequences can be selected to bind various target molecules, including proteins.

Purpose of the Study:

• To describe a selection strategy using single-stranded DNA (ssDNA) for isolating ligands that bind to histidine-tagged proteins.
• To present a method adaptable for both manual laboratory execution and fully automated robotic platforms.

Main Methods:

• Utilizing the SELEX methodology for ssDNA library selection.
• Employing a histidine-tagged protein as the target molecule for affinity selection.
• Describing protocols for both manual and automated (robotic) implementation of the SELEX process.

Main Results:

• The described SELEX strategy effectively identifies ssDNA sequences with high specificity and affinity for the target histidine-tagged protein.
• The protocol is validated for its applicability in both hands-on manual settings and automated robotic systems.

Conclusions:

• The SELEX method provides a robust approach for discovering specific DNA ligands for protein targets.
• The described strategy offers flexibility, enabling efficient ligand discovery through either manual or automated SELEX platforms.