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Scabicidin from Insect Gut Streptomyces Effectively Controls Potato Scab by Targeting DNA Gyrase
Yuxuan Han1, Yiyi Shao1, Na Zhao1
1Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, Harbin 150030, China.
Journal of Agricultural and Food Chemistry
|May 5, 2026
Summary
A novel antibiotic, scabicidin, derived from insect-associated Streptomyces, effectively controls potato scab. This natural compound targets Streptomyces pathogens, offering a promising alternative to chemical treatments for this soil-borne disease.
Area of Science:
- Microbiology
- Plant Pathology
- Natural Products Chemistry
Background:
- Potato scab is a significant soil-borne disease caused by Streptomyces species.
- Current chemical controls for potato scab are limited and often ineffective.
Purpose of the Study:
- To identify and characterize a novel antibacterial agent from Streptomyces for potato scab management.
- To evaluate the efficacy and mechanism of action of the identified compound.
Main Methods:
- Isolation of Streptomyces niveus NEAU-TZZ3 from Diestrammena japonica.
- Identification and purification of the antibacterial metabolite, scabicidin.
- In vitro testing against Streptomyces pathogens and in vivo pot/field trials.
- Mechanistic studies involving DNA gyrase GyrB subunit interaction.
Main Results:
- Scabicidin demonstrated potent activity against six potato scab-causing Streptomyces species (EC50: 0.056–0.84 μg/mL).
- Pot and field trials showed dose-dependent control of potato scab, with efficacy rates of 81.7% and 52.03%, respectively.
- Scabicidin was found to inhibit Streptomyces scabies by targeting the DNA gyrase GyrB subunit, disrupting DNA supercoiling.
Conclusions:
- Scabicidin is a potent natural antibiotic isolated from insect-associated Streptomyces.
- It shows significant potential for managing potato scab, offering an effective alternative to chemical treatments.
- The compound's mechanism of action provides insight into its antibacterial properties.
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