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Protein Engineering by Yeast Surface Display
Published on: November 29, 2024
Highly avid magnetic bead capture: an efficient selection method for de novo protein engineering utilizing yeast
Margaret Ackerman1, David Levary, Gabriel Tobon
1Dept. of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Biotechnology Progress
|April 14, 2009
Summary
This study introduces a novel yeast surface display method using multivalent magnetic bead selection to capture rare protein binders. This technique efficiently isolates weak binders from large libraries, overcoming limitations of traditional flow cytometry.
Area of Science:
- Biotechnology
- Protein Engineering
- Molecular Biology
Background:
- Yeast surface display is crucial for protein engineering, enabling affinity improvements through diversification and selection.
- Flow cytometry (FACS) has limitations for isolating de novo binders from naive libraries, including population size, minimum affinity, antigen requirements, and artifactual binders.
Purpose of the Study:
- To develop a method for capturing rare de novo protein binders from naive libraries using yeast surface display.
- To overcome the limitations of flow cytometry in isolating weak or rare binders.
Main Methods:
- Coupling the multivalency of yeast surface display with multivalent target presentation on magnetic beads.
- Utilizing magnetic beads for selection of binders against target antigens.
- Performing negative selections to exclude cross-reactive binders.
Main Results:
- Isolation of extremely weak binders from billions of non-binding clones.
- Achieved 30,000-fold enrichment and quantitative capture of micromolar binders in a single pass.
- Required less than one microgram of target antigen per selection.
- Successfully isolated de novo binders against lysozyme and streptavidin-biotin without cross-reactivity to streptavidin.
Conclusions:
- The developed multivalent surface selection method enhances yeast surface display capabilities for isolating rare and weak binders.
- This approach minimizes the need for large antigen quantities and reduces the isolation of artifactual binders.
- The method is robust and versatile, applicable to both positive and negative selections for protein engineering.
