A Yeast-Based Functional Assay to Study Plant N-Degron - N-Recognin Interactions

Area of Science:

• Molecular Biology
• Synthetic Biology
• Plant Science

Background:

• The N-degron pathway targets proteins for degradation via their N-terminal residues.
• Understanding this pathway is crucial for regulating protein homeostasis.
• Existing methods for studying N-degron pathway components have limitations.

Purpose of the Study:

• To establish a novel, straightforward assay for analyzing the plant N-degron pathway.
• To investigate the function of Arabidopsis thaliana N-degron pathway enzymes in a heterologous system.
• To overcome limitations of current in vitro and in planta assays.

Main Methods:

• Utilized synthetic biology by expressing Arabidopsis thaliana ubiquitin ligase PRT6 and ubiquitin conjugating enzyme 2 (AtUBC2) in a mutant Saccharomyces cerevisiae strain.
• Developed an assay to monitor the stability of GFP-linked plant proteins with N-terminal Arginine degradation signals.
• Co-expressed plant proteins and yeast-expressed plant N-degron pathway components.

Main Results:

• Successfully reconstituted a functional portion of the plant N-degron pathway in yeast.
• Demonstrated the utility of the novel assay for straightforward analysis of protein stability.
• Showcased the ability to detect substrate recognition by N-degron pathway enzymes.

Conclusions:

• The developed synthetic biology assay provides a simplified and effective method for studying the plant N-degron pathway.
• This approach facilitates the analysis of N-degron pathway enzyme-substrate interactions.
• The assay offers advantages over complex and time-consuming in planta or less sensitive in vitro methods.