Isolation and partial characterization of bacteriocins from Pediococcus species.
Lactic acid bacteria have received increased attention as a potential food preservative due to their strong antagonistic activity against many food-spoilage and pathogenic organisms. Three Pediococcus species, P. acidilactici NCIM 2292 , P. pentosaceous. NCIM 2296 and P. cervisiae NCIM 2171, were evaluated for bacteriocin production. Inhibitory substance were produced during the late growth phase and maximum production occurred at 37 degrees after 36-48 h of incubation. Bacteriocins partially purified from these species by cold-acetone precipitation at 0 degrees C and cell adsorption desorption techniques have a broad inhibitory spectrum against microorganisms, including gram-negative bacteria such as Escherichia coli and Pseudomonas. Proteolytic enzymes inactivated these peptides, but amylase and lipase did not show any effect. The bacteriocins were stable over a wide pH range (3-8) and apparently most active at pH 4.0-5.0. They were heat-stable (1 h at approximately 80 degrees C and autoclaving) at pH 5.0. No loss in activity was observed when stored under refrigeration (4-8 degrees C). Tris-Tricine SDS-PAGE revealed the molecular masses of these peptides to be between 3.5 and 5.0 kDa.
Jamuna
M
M
Biochemistry and Nutrition Discipline, Defence Food Research Laboratory, Siddarthanagar, 570 011, Mysore, India.
Jeevaratnam
K
K
D000681:Amylases / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000096:biosynthesis / Q000302:isolation & purification / Q000494:pharmacology; D000898:Antibiosis; D001430:Bacteriocins / Q000096:biosynthesis / Q000302:isolation & purification* / Q000378:metabolism / Q000494:pharmacology*; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development; D006090:Gram-Negative Bacteria / Q000187:drug effects / Q000254:growth & development; D006094:Gram-Positive Bacteria / Q000187:drug effects / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D008049:Lipase / Q000378:metabolism; D008970:Molecular Weight; D010376:Pediococcus / Q000254:growth & development / Q000378:metabolism*; D010447:Peptide Hydrolases / Q000378:metabolism; D011549:Pseudomonas / Q000187:drug effects / Q000254:growth & development; D013696:Temperature; D013997:Time Factors
D000900:Anti-Bacterial Agents; D001430:Bacteriocins; D008049:Lipase; D000681:Amylases; D010447:Peptide Hydrolases