Related Experiment Videos
Using an AraC-based three-hybrid system to detect biocatalysts in vivo
S M Firestine1, F Salinas, A E Nixon
1Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA.
Nature Biotechnology
|May 10, 2000
Summary
Researchers developed QUEST, a novel method for screening enzyme libraries. This system links enzyme activity to reporter gene expression, enabling efficient discovery of biocatalysts for various reactions.
Area of Science:
- Biochemistry
- Molecular Biology
- Synthetic Biology
Background:
- Protein engineering and directed evolution have accelerated the discovery of proteins with novel functions.
- Screening and selection methods are critical bottlenecks in identifying novel biocatalysts from large protein libraries.
Purpose of the Study:
- To develop a general and versatile method for screening enzyme libraries.
- To enable the selection of enzymes based on their catalytic activity for any enzymatic reaction.
Main Methods:
- Developed QUEST (QUerying for EnzymeS using the Three-hybrid system), a novel screening platform.
- Coupled in vivo substrate concentration to reporter operon transcriptional levels.
- Utilized the arabinose operon activator AraC for system construction.
Main Results:
- Demonstrated the ability to detect the fungal enzyme scytalone dehydratase (SD) in bacteria.
- Showcased the sensitivity and utility of the QUEST system in library screening.
- Established a phenotype that is easily screened or selected for any enzymatic reaction.
Conclusions:
- The QUEST system offers a generalizable approach for discovering novel biocatalysts.
- This method overcomes limitations in current enzyme screening technologies.
- QUEST facilitates the efficient identification of enzymes with desired catalytic functions from large libraries.