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Optimized Phage Display-Based Selection for the Development of Heterodimerizing Optogenetic Tools.

Giang N T Le1, Jaewan Jang1,2, Maruti Uppalapati3

  • 1Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H7, Canada.

ACS Synthetic Biology
|May 9, 2025
PubMed
Summary
This summary is machine-generated.

Developing new optogenetic tools requires highly selective binders for photoswitchable proteins. This study optimized phage display to effectively capture subtle conformational changes in cyanobacteriochrome GAF domains, yielding selective binders.

Keywords:
cyanobacteriochrome-based GAFoptogeneticphage displayphotoswitchable proteinprotein engineering

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Optogenetics

Background:

  • Display techniques like phage display expand the optogenetic toolbox by developing binding partners for photoswitchable proteins.
  • Discovering selective binders for targets like cyanobacteriochrome (CBCR) GAF domains is challenging due to subtle conformational differences.

Purpose of the Study:

  • To present an optimized phage display protocol for capturing subtle conformational changes in photoswitchable proteins.
  • To demonstrate the protocol's utility in identifying highly selective binders for the CBCR GAF domain family.

Main Methods:

  • Optimized phage display protocol with high selection pressure.
  • Modified elution methods and tightened negative selection strategies.
  • Multiple selection campaigns for binder enrichment.

Main Results:

  • Successfully enriched selective binders for CBCR GAF domains.
  • Demonstrated the protocol's effectiveness in capturing subtle conformational state differences.
  • Identified highly selective binders through optimized selection pressure.

Conclusions:

  • The optimized phage display protocol is effective for discovering selective binders against challenging targets with subtle conformational states.
  • This method enhances the development of optogenetic tools by improving binder selectivity.
  • The protocol offers a valuable approach for advancing research in photoswitchable protein engineering.