Related Experiment Video
Updated: Aug 9, 2026
07:54
A Method to Assess Bacteriocin Effects on the Gut Microbiota of Mice
Published on: July 25, 2017
Searching for bacteriocin-producing lactic acid bacteria in soil
Fujitoshi Yanagida1, Yi-Sheng Chen, Takashi Shinohara
1The Institute of Enology and Viticulture, University of Yamanashi, Kitashin, Kofu, Japan.
The Journal of General and Applied Microbiology
|April 7, 2006
Summary
Soil harbors novel bacteriocin-producing lactic acid bacteria. Researchers isolated three strains with antibacterial properties, including a new bacteriocin from Lactobacillus animalis, suggesting soil as a promising source for discovering these antimicrobial substances.
Area of Science:
- Microbiology
- Food Science
- Biotechnology
Background:
- Lactic acid bacteria (LAB) are known producers of bacteriocins, antimicrobial peptides with potential applications in food preservation and medicine.
- Soil is a rich and diverse microbial habitat, yet its potential as a source for novel bacteriocin-producing LAB remains underexplored.
Purpose of the Study:
- To isolate and characterize bacteriocin-producing LAB from soil samples.
- To investigate the antibacterial activity of isolated LAB against pathogenic or spoilage bacteria.
- To identify novel bacteriocins and their producing strains.
Main Methods:
- Isolation of acid-producing bacterial strains from soil samples collected in Yamanashi prefecture, Japan.
- Screening of isolates for antibacterial activity against a target indicator strain (Lactobacillus sakei JCM 1157T).
- Partial characterization of bacteriocin produced by promising isolates.
Main Results:
- Forty-two acid-producing bacterial strains were isolated from 55 soil samples.
- Three isolates, Lactobacillus animalis C060203, Enterococcus durans C102901, and Leuconostoc mesenteroides subsp. mesenteroides C060204, exhibited significant antibacterial activity.
- The bacteriocin from Enterococcus durans C102901 displayed distinct characteristics compared to known durancins.
- This study reports the first instance of bacteriocin production by Lactobacillus animalis.
Conclusions:
- Soil is a viable and common source for isolating novel bacteriocin-producing LAB.
- The identified bacteriocins from Enterococcus durans C102901 and Lactobacillus animalis C060203 represent potential new antimicrobial agents.
- Further research into these novel bacteriocins could lead to new applications in food safety and therapeutics.
Related Concept Videos
01:27Microbes in the Production of Fermented Foods
Lactic acid bacteria (LAB) and molds are instrumental in fermenting plant-based foods to enhance preservation and ensure year-round availability. These microbial processes convert plant carbohydrates into organic acids and other metabolites that inhibit spoilage organisms and contribute to the sensory qualities of the final product.In sauerkraut production, cabbage goes through a microbial succession that starts with cocci such as Leuconostoc mesenteroides. These microbes begin fermentation by...
01:25Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
01:22Probiotics
Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...
01:18Production of Biopesticides
Biopesticides offer a sustainable alternative to chemical pesticides, utilizing microbial agents to control agricultural pests. Bacillus thuringiensis (Bt) is a widely employed bacterium known for its potent insecticidal activity. Bt biopesticides are favored for their specificity to insect pests, minimal environmental impact, and natural degradability.Mechanism of Bt Toxin Action Bt produces insecticidal crystal (Cry) proteins during its sporulation phase. These proteins form parasporal...
01:29Microbes in Food Production
Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...
01:27Microorganisms in Agriculture and Food industry
Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...