Characterization and application of enterocin RM6, a bacteriocin from Enterococcus faecalis.

Area of Science:

• Food Microbiology
• Antimicrobial Peptides
• Bacteriocins

Background:

• Bacteriocins are increasingly recognized for their role in food preservation.
• Enterococcus faecalis OSY-RM6 produces bacteriocins with potential antimicrobial activity.

Purpose of the Study:

• To characterize enterocin RM6 from Enterococcus faecalis OSY-RM6.
• To evaluate the efficacy of enterocin RM6 against Listeria monocytogenes in cottage cheese.

Main Methods:

• Purification of enterocin RM6 using ion exchange chromatography and HPLC.
• Molecular weight determination by mass spectrometry (MS).
• Structural analysis using tandem mass spectrometry (MS/MS) and gene sequencing.

Main Results:

• Enterocin RM6 is a 70-residue cyclic peptide with a molecular weight of 7145.0823 Da.
• The peptide exhibits activity against Gram-positive bacteria, including Listeria monocytogenes, Bacillus cereus, and MRSA.
• A 4-log reduction in Listeria monocytogenes population was achieved in cottage cheese within 30 minutes at 80 AU/mL.

Conclusions:

• Enterocin RM6 is a potent antimicrobial peptide with a defined cyclic structure.
• Enterocin RM6 demonstrates significant potential as a natural food preservative against Listeria monocytogenes.
• This bacteriocin can be a valuable tool for improving food safety and preventing foodborne diseases.