A Tethered Yeast Surface Display System Facilitates Enriching Epitope-Specific Binding Interactions

Area of Science:

• Biotechnology
• Protein Engineering
• Molecular Biology

Background:

• Therapeutic protein engineering has advanced significantly but lacks efficient epitope-specific binder screening methods.
• Current strategies struggle to identify binders targeting specific epitopes crucial for desired protein functions.
• Developing functional protein binders requires effective screening for epitope recognition.

Purpose of the Study:

• To develop a novel tethered yeast surface display system for efficient screening of epitope-specific protein binders.
• To overcome limitations in current methods for identifying functional protein binders targeting specific epitopes.
• To accelerate the development of therapeutic proteins by improving binder screening.

Main Methods:

• Designed a tethered yeast surface display construct linking candidate binders to target proteins of interest (POIs) via peptide linkers.
• Leveraged high local concentrations created by tethering to enable functional screening.
• Utilized decreased fluorescent signal in the presence of competitive POI binders to identify epitope-specific binders.

Main Results:

• Demonstrated successful epitope-specific screening and enrichment of protein binders using the developed system.
• Confirmed that the method relies on fluorescent output, indicating functional binding.
• Identified and studied key optimization parameters for the tethered display technique.

Conclusions:

• The novel tethered yeast surface display system enables efficient screening for epitope-specific protein binders.
• This technique accelerates binder development by reducing the need for low-throughput downstream epitope mapping.
• The method holds promise for advancing therapeutic protein engineering and drug discovery.