Proteomics and Transcriptomics Uncover Key Processes for Elasnin Tolerance in Methicillin-Resistant Staphylococcus...

Area of Science:

• Microbiology
• Molecular Biology
• Drug Discovery

Background:

• Elasnin is a novel compound with demonstrated antibiofilm activity against MRSA.
• The antibacterial effects of elasnin on planktonic MRSA cells remain largely unexplored.

Purpose of the Study:

• To investigate the antibacterial activity of elasnin against growing S. aureus planktonic cells.
• To understand the mechanisms of elasnin tolerance and its impact on cellular processes in MRSA.

Main Methods:

• Adaptive laboratory evolution (ALE) to generate elasnin-tolerant MRSA strains.
• Whole-genome sequencing to identify genetic mutations associated with tolerance.
• Proteomics and transcriptomics to analyze changes in cellular pathways.
• Phenotypic characterization of evolved strains.

Main Results:

• Elasnin demonstrated antibacterial activity against planktonic MRSA.
• Evolved strains exhibited increased elasnin tolerance, reduced growth, and altered sensitivity to daptomycin and lysostaphin.
• A mutation in a phosphate transport regulator was identified in tolerant strains, leading to increased intracellular phosphate levels.
• Elasnin treatment downregulated cell division, cell wall synthesis, and other metabolic pathways, while upregulating transport and oxidative phosphorylation proteins.

Conclusions:

• Elasnin possesses antibacterial activity against planktonic MRSA, in addition to its antibiofilm properties.
• Elasnin tolerance is associated with alterations in phosphate metabolism and energy production pathways.
• Elasnin's mechanism involves suppressing essential cellular processes, suggesting its potential as a drug adjuvant for MRSA infections.