Halogenated flavonoids as novel antimicrobial and antifungal compounds for crop protection
Engineered yeast platform for producing halogenated flavonoids with enhanced antimicrobial properties. This approach combines flavonoid biosynthesis with halogenase enzymes to create stable, bioavailable crop protection compounds targeting bacterial and fungal pathogens.
Overview
This research develops halogenated flavonoids as a new class of antibacterial and antifungal compounds for crop protection. Flavonoids are naturally occurring plant secondary metabolites known for antimicrobial activity, but their effectiveness can be limited by bioavailability and stability challenges. By introducing halogen atoms into flavonoid structures using engineered yeast, this approach aims to produce novel compounds with improved binding efficacy, enhanced stability, and potentially new mechanisms of action against agricultural pathogens.
The platform addresses a critical need in agriculture for new antimicrobial solutions, particularly as resistance to existing fungicides and bactericides continues to grow. Halogenated flavonoids may offer distinct modes of action compared to conventional crop protection chemicals, making them valuable candidates for integrated pest and disease management programs.
Technical specifications
Core approach:
- Engineering yeast strains to express both flavonoid biosynthetic pathways and halogenase enzymes
- Combining existing flavonoid production capabilities (naringenin, liquiritigenin, daidzein, and genistein) with two identified halogenases capable of modifying these compounds
- Optimizing strain performance to achieve high-level production yields suitable for testing and scale-up
Scientific basis:
- Flavonoids have demonstrated antimicrobial effects through multiple mechanisms, including inhibition of cell wall synthesis, disruption of DNA replication, and interference with microbial metabolism
- Halogenation has been shown to improve the pharmacological properties of various drug molecules, including enhanced bioavailability and target binding
- The combination may yield compounds with novel interactions against bacteria and fungi
Validation approach:
- Testing halogenated flavonoid efficacy against cultured fungi and bacteria
- Comparative analysis measuring IC50 values against original (non-halogenated) flavonoids and currently used antimicrobial/antifungal compounds
- Assessment of activity spectrum across relevant agricultural pathogens
Technology readiness level
This technology is currently at an early research and development stage (TRL 2-3). Key foundational work has been completed, including construction of a yeast strain capable of producing multiple flavonoid compounds and identification of two halogenase enzymes that can modify these flavonoids in yeast. These proof-of-concept results establish feasibility of the biosynthesis approach.
The next phase involves strain optimization to achieve sufficient production yields for comprehensive antimicrobial testing. Laboratory validation against bacterial and fungal cultures will demonstrate proof-of-concept efficacy. Significant additional development would be required before field testing and commercial application, including scale-up studies, formulation development, regulatory assessment, and field trials under agricultural conditions.
This represents an early-stage opportunity for partners interested in agricultural biotechnology, novel antimicrobial discovery, or synthetic biology applications in crop protection.
About Cornell University
Cornell University is a comprehensive private, land-grant research university with campuses in Ithaca and New York City, combining significant scale with cross-disciplinary breadth. Industry connects through open-access user facilities and prototyping labs, pilot-scale testbeds, and a research and technology park that provide pathways from discovery to demonstration. A statewide extension network and integration with a major hospital system enable real-world deployment, while a graduate campus embedded in New York City’s tech corridor provides direct access to startups, venture investors, and corporate R&D teams. Research is supported by competitive federal funding from agencies such as the National Science Foundation, National Institutes of Health, the Department of Energy, and the U.S. Department of Agriculture. A dedicated technology transfer office streamlines IP management, licensing, startup formation, and corporate partnerships across campuses.
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