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Updated: Jan 16, 2026
Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
Discovery of WML-01, a Spirocyclic Butenolide Derivative Featuring a Rhodanine Motif, Exhibiting High Fungicidal
Yihao Li1, Tingting Zhang1, Haoyun Ma1
1Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China.
Abstract:
Controlling the Fusarium head blight (FHB) epidemic and deoxynivalenol (DON) contamination, predominantly caused by Fusarium graminearum, remains challenging. In this study, rhodanine was introduced into a spirocyclic butenolide-based chemical library to design novel fungicidal agents. In vitro assays revealed that target compounds exhibited excellent activities against F. graminearum, F. fujikuroi, and Sclerotinia sclerotiorum. The EC50 of the representative compound WML-01 was 0.079 μg/mL against F. graminearum and 0.72 μg/mL against F. fujikuroi. Transmission electron microscopy showed that WML-01, like phenamacril, disrupted the cell membrane of F. graminearum, causing deposition of lipid droplets. WML-01 inhibited DON biosynthesis as effectively as phenamacril but showed no cross-resistance, indicating a different mode of action. Transcriptome analysis indicated that WML-01 strongly suppresses ribosomal subunit assembly, impairing protein synthesis. Field trials demonstrated that WML-01 performs comparably to phenamacril in controlling FHB. Overall, WML-01 is a promising candidate for managing FHB and DON contamination.
Insights
A novel fungicide, WML-01, effectively controls Fusarium head blight (FHB) and deoxynivalenol (DON) contamination. It disrupts fungal cell membranes and protein synthesis, offering a new solution for crop protection.
Area of Science:
- Agricultural Science
- Mycology
- Organic Chemistry
Background:
- Fusarium head blight (FHB) and deoxynivalenol (DON) contamination pose significant threats to cereal crops.
- Controlling these issues, often caused by *Fusarium graminearum*, remains a persistent agricultural challenge.
Purpose of the Study:
- To design and evaluate novel fungicidal agents based on a spirocyclic butenolide scaffold incorporating rhodanine.
- To assess the efficacy of the synthesized compounds against key plant pathogens and their potential for FHB and DON management.
Main Methods:
- Synthesis of novel compounds by introducing rhodanine into a spirocyclic butenolide library.
- In vitro antifungal activity assays against *F. graminearum*, *F. fujikuroi*, and *Sclerotinia sclerotiorum*.
- Transmission electron microscopy, DON biosynthesis inhibition assays, transcriptome analysis, and field trials.
Main Results:
- The representative compound WML-01 demonstrated potent in vitro activity against tested fungi, with low EC50 values.
- WML-01 disrupted the cell membrane of *F. graminearum* and inhibited DON biosynthesis with no cross-resistance to phenamacril.
- Transcriptome analysis revealed WML-01 suppresses ribosomal subunit assembly, impacting protein synthesis; field trials confirmed its efficacy comparable to phenamacril in controlling FHB.
Conclusions:
- WML-01 is a promising novel fungicide with a distinct mode of action for managing FHB and DON contamination.
- The compound's ability to inhibit fungal growth and mycotoxin production makes it a valuable candidate for agricultural applications.
- Further research into WML-01 could lead to improved strategies for safeguarding crop yields and quality.
