ABA Receptor Antagonists with Cyclopropyl Substituents
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Solution Overview
Problem
Current ABA receptor antagonists have limitations such as phototoxicity, complex synthetic routes, incomplete antagonism, low potency, and unfavorable selectivity profiles, which hinder their effectiveness in agricultural applications for enhancing seed germination and drought tolerance.
Innovation Solution
Development of potent ABA antagonists using click chemistry to synthesize OP derivatives that prevent gate closure in ABA receptors, thereby blocking activation and enhancing germination and transpiration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing ABA receptor antagonists (AS6, PAO4, PanMe, RK460) are used, then some level of receptor blocking is achieved, but they exhibit phototoxicity, complex synthetic routes, incomplete antagonism, low potency, and unfavorable selectivity profiles
Solution Approach 1:
The patent modifies the chemical structure of ABA antagonists by changing key parameters such as introducing a cyclopropyl group at the 3-position and specific substituents at the 4-position (e.g., -COOH, -CONH2, -NH2). These structural parameter changes result in compounds with improved potency, selectivity, and reduced phototoxicity while maintaining relatively simple synthetic routes through standard organic chemistry transformations.
Solution Approach 2:
The invention creates composite molecular structures by combining the ABA core structure with specific functional groups and substituents (cyclopropyl, carboxyl, amide, amino groups). This composite approach allows optimization of multiple properties simultaneously - the core structure provides receptor binding while the appended groups enhance potency, selectivity, and metabolic stability without requiring complex multi-step syntheses.
2Productivity
If ABA receptor antagonists are used to enhance germination and increase transpiration, then plant growth is stimulated, but phototoxicity and phytotoxicity occur at high concentrations
Solution Approach 1:
The patent systematically modifies molecular parameters of ABA antagonists by introducing specific substituents (cyclopropyl at 3-position, various groups at 4-position) that change the photophysical and biological properties. These parameter changes reduce phototoxicity and phytotoxicity while maintaining or enhancing germination stimulation and transpiration promotion effects, allowing effective dosing without harmful side effects.
Solution Approach 2:
The invention converts potentially harmful high-concentration effects into beneficial low-concentration effects by structurally modifying the antagonists. The modified structures bind with higher affinity to ABA receptors, achieving the desired physiological effects (enhanced germination, increased transpiration) at lower concentrations that avoid phototoxicity and phytotoxicity, effectively turning what would be harmful high-dose effects into beneficial low-dose effects.
3Strength
If existing antagonists like AS6 and PanMe are used, then gate closure is enabled, but steric clashes frustrate the ability of activated receptors to bind PP2Cs
Solution Approach 1:
The patent applies local quality changes by introducing specific functional groups at specific positions of the ABA molecule. The cyclopropyl group at the 3-position and the varied substituents at the 4-position (carboxyl, amide, amino) create localized steric and electronic effects that enable gate closure while leaving the critical PP2C binding interface intact. This localized modification allows the receptor to achieve the closed conformation necessary for signaling while maintaining the ability to bind PP2Cs for downstream signaling.
Solution Approach 2:
The invention segments the ABA molecule into distinct functional regions: the core structure that mediates gate closure and the appended substituents that modulate PP2C binding. By separating these functions into distinct molecular segments, the patent allows each region to optimize its specific function without interfering with the other, resolving the conflict between achieving gate closure and maintaining PP2C binding capability.
Data Source
AI summary
The present invention sets forth new compounds that potently block activation of ABA receptors. In some aspects, these compounds can be used to enhance germination of crop seeds to stand establishment and to increase transpiration and photosynthetic yields when water is not limiting plant growth.