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Updated: Mar 18, 2026
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Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay PCA in Living Cells
Published on: March 3, 2015
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A protein-fragment complementation assay to quantify synthetic protein scaffold efficiency.
Pascale Lemieux1,2,3,4, Alexandre K Dubé1,2,3,4, Christian R Landry1,2,3,4,5,6
1Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Québec G1V 0A6, QC, Canada.
Synthetic Biology (Oxford, England)
|March 16, 2026
Summary
Protein scaffolds enhance synthetic biology by bringing enzymes together. Researchers used a novel assay in yeast to find new scaffold components, improving protein scaffold design for biotechnology applications.
Area of Science:
- Synthetic biology
- Biotechnology
- Protein engineering
Background:
- Protein scaffolds are crucial tools in synthetic biology, enabling applications like increased yield and optimized signaling specificity.
- Current PBD-peptide combinations for scaffolds in yeast have shown limited success, necessitating further exploration.
- Characterizing scaffold efficiency is challenging due to difficulties in quantitatively measuring pathway outputs.
Purpose of the Study:
- To explore and characterize novel peptide-binding domain (PBD)-peptide pairs for protein scaffold design in yeast.
- To establish a robust method for quantifying scaffold efficiency using the dihydrofolate reductase protein-fragment complementation assay (DHFR PCA).
- To identify key factors influencing scaffold performance, including PBD-peptide interaction strength, binding availability, scaffold architecture, and expression levels.
Main Methods:
- Utilized the DHFR PCA in yeast to couple scaffold efficiency with cell growth rate.
- Characterized the strength of PBD-peptide interactions (PPI) and the in vivo binding availability of PBDs and peptides.
- Tested various scaffold architectures and expression levels to assess their impact on scaffolding efficiency.
- Employed DHFR PCA to screen and identify novel PBD-peptide pairs.
Main Results:
- Scaffold efficiency is critically dependent on the PPI strength of the weakest binding PBD-peptide pair.
- In vivo binding availability of certain domains and peptides limits overall PPI strength.
- Minor changes in scaffold architecture and expression levels significantly affect scaffolding efficiency as detected by DHFR PCA.
- Identified novel PBD-peptide pairs suitable for expanding the toolbox for yeast scaffold design.
Conclusions:
- The DHFR PCA provides an effective and quantitative method for characterizing protein scaffold efficiency in yeast.
- Optimizing PPI strength and ensuring sufficient binding availability are key for effective protein scaffold design.
- Novel PBD-peptide pairs have been identified, expanding options for engineering protein scaffolds in yeast.
- This work facilitates the development of improved synthetic biology tools for biotechnological applications.
