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Defining and Exploiting Hypersensitivity Hotspots to Facilitate Abscisic Acid Agonist Optimization
Dezi Elzinga1,2, Erin Sternburg1,3, Davide Sabbadin2,4
1Institute for Integrative Genome Biology , University of California Riverside , Riverside , California 92521 , United States.
ACS Chemical Biology
|January 23, 2019
Summary
Researchers identified ligand binding hotspots in abscisic acid (ABA) receptors, guiding the development of more potent synthetic agonists for improved plant drought tolerance and engineered receptor sensitivity.
Area of Science:
- Plant Biology
- Molecular Pharmacology
- Biochemistry
Background:
- Pyrabactin resistance 1 (PYR1) and related abscisic acid (ABA) receptors are critical targets for enhancing plant drought tolerance.
- Understanding ligand interactions with these receptors is key to developing effective agricultural applications.
Purpose of the Study:
- To identify ligand binding hotspots in PYR1 receptors using hypersensitive mutants.
- To guide the optimization of synthetic agonists for improved potency and receptor sensitivity.
Main Methods:
- Generation and analysis of PYR1 hypersensitive mutants.
- Synthesis and in vitro testing of quinabactin (QB) analogues.
- Engineering of ABA-regulated transcriptional circuits in mammalian cells.
Main Results:
- Defined a ligand binding hotspot involving residue A160, crucial for ABA and QB interactions.
- Developed QB analogues with up to 10-fold increased in vitro activity.
- Significantly enhanced the sensitivity of an engineered mammalian cell ABA-regulated transcriptional circuit.
Conclusions:
- Systematic mapping of hypersensitivity sites effectively guides ligand optimization.
- Engineered ABA receptor sensitivity can be tuned for specific applications.
- This approach offers a pathway to improved crop resilience and synthetic biology tools.
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