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Bacteriocin-like substance production by Bacillus licheniformis strain P40
F Cladera-Olivera1, G R Caron, A Brandelli
1Laboratório de Bioquímica e Microbiologia Aplicada, Departamento de Ciência de Alimentos, ICTA, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil.
Letters in Applied Microbiology
|June 25, 2004
Summary
Bacillus licheniformis from the Amazon produces a broad-spectrum antibacterial peptide. This compound effectively inhibits pathogens like Listeria monocytogenes, enhancing food safety.
Area of Science:
- Microbiology
- Biochemistry
Background:
- Bacillus species are known producers of antimicrobial compounds.
- The Amazon basin is a rich source of microbial biodiversity.
Purpose of the Study:
- To isolate and characterize bacteriocin-like compounds from Bacillus species found in the Amazon basin.
- To evaluate the antimicrobial spectrum and stability of a novel bacteriocin.
Main Methods:
- Isolation of Bacillus spp. from Amazon basin samples.
- Antimicrobial activity assays against various indicator strains.
- Characterization of the antimicrobial substance's stability (temperature, pH, proteases).
Main Results:
- Bacillus licheniformis strain P40 produced an antimicrobial substance.
- The substance inhibited Listeria monocytogenes, Bacillus cereus, and Streptococcus spp.
- The compound was heat-stable up to 100°C, stable across pH 3-11, and resistant to trypsin and papain but sensitive to pronase E.
- The substance exhibited bactericidal and bacteriolytic activity against Listeria monocytogenes.
Conclusions:
- A novel antibacterial peptide from Bacillus licheniformis was identified and characterized.
- The peptide exhibits broad-spectrum activity against foodborne pathogens and spoilage organisms.
- This finding contributes to food safety by identifying potential natural antimicrobial agents.