Directional and Strain-Specific Interaction Between Lactobacillus plantarum and Staphylococcus aureus

Area of Science:

• Microbiology
• Proteomics
• Bacterial Interactions

Background:

• Staphylococcus aureus causes infections, including toxic shock syndrome.
• Lactobacillus species can inhibit S. aureus through organic acids and bacteriocins.
• Molecular mechanisms of Lactobacillus-S. aureus interactions require further investigation.

Purpose of the Study:

• To analyze the proteomic interactions between Lactobacillus plantarum and Staphylococcus aureus strains.
• To understand the molecular dynamics of bacterial antagonism in co-culture.
• To identify strain-specific responses during co-cultivation.

Main Methods:

• Co-cultivation of Lactobacillus plantarum WCFS1 with Staphylococcus aureus strains FRI-1169 and MN8.
• Proteomic analysis of differentially expressed proteins (DEPs) in spent media and cytosols.
• Comparison of protein expression profiles to identify bacterial responses.

Main Results:

• L. plantarum exhibited a more significant effect on S. aureus, with more DEPs and upregulated proteins.
• S. aureus showed fewer DEPs and predominantly downregulated proteins in response to L. plantarum.
• Distinct, directional, and strain-specific proteomic responses were observed.

Conclusions:

• L. plantarum exerts a strong antagonistic effect on S. aureus at the proteomic level.
• Proteomic analysis is a valuable tool for elucidating complex bacterial interactions.
• Findings support the development of non-antibiotic strategies targeting S. aureus infections.