Enabling Flow-Based Kinetic Off-Rate Selections Using a Microfluidic Enrichment Device.

Area of Science:

• Biotechnology
• Molecular Biology
• Genomics

Background:

• Genomic sequencing rapidly identifies potential diagnostic and therapeutic targets.
• Existing methods struggle to produce the necessary peptide- and protein-based ligands for target study.
• A bottleneck exists in ligand generation for novel targets.

Purpose of the Study:

• To develop a novel method for kinetic off-rate selection of ligands.
• To create a microfluidic enrichment device (MFED) that bypasses the need for exogenous competitors.
• To accelerate the generation of peptide- and protein-based ligands for studying genomic targets.

Main Methods:

• Development of a microfluidic enrichment device (MFED).
• Kinetic off-rate selection without exogenous competitor.
• Tuning device conditions (bed volume, flow rate, immobilized target) to control ligand binding kinetics.
• Application of simple kinetic equations to model ligand binding.

Main Results:

• The MFED enables kinetic off-rate selection by manipulating flow rates.
• Observed kinetic rate constants align with independent measurements.
• Demonstrated a 4-fold improvement in ligand enrichment compared to standard selection methods.
• Reduced target-protein demand to less than a nanomole per selection.

Conclusions:

• The MFED effectively biases ligand pools toward high-affinity binders.
• This device accelerates the study of targets identified by modern genomic sequencing.
• The MFED offers a more efficient approach to ligand generation for biological research and drug discovery.