Structural changes in Clostridium botulinum type E after treatment with boticin S5 1

Area of Science:

• Microbiology
• Molecular Biology
• Bacteriology

Background:

• Bacteriocins are ribosomally synthesized antimicrobial peptides with diverse mechanisms of action.
• Clostridium botulinum type E is a significant foodborne pathogen.
• Boticin S5(1) is a bacteriocin produced by an organism related to Clostridium botulinum type E.

Purpose of the Study:

• To investigate the morphological effects of boticin S5(1) on a sensitive Clostridium botulinum type E strain.
• To compare the observed changes with those induced by other bacteriocins.

Main Methods:

• Treatment of Clostridium botulinum type E strain 070 with purified boticin S5(1).
• Microscopic examination of cellular structures, including nucleoid and mesosomes.
• Comparative analysis of morphological changes with existing literature.

Main Results:

• Boticin S5(1) treatment induced aggregation of nucleoid deoxyribonucleic acid into dense masses.
• Mesosomes underwent structural rearrangement from lamellar to vesicular configurations.
• Complete dissolution of cell contents resulted in bacterial ghosts with intact cell walls.

Conclusions:

• Boticin S5(1) causes extensive and specific morphological alterations in Clostridium botulinum type E.
• The observed changes are similar to those induced by a bacteriocin-like substance from Staphylococcus aureus on streptococci.
• A shared mode of action between these bactericidal agents is proposed.