Microbial competition between Bacillus subtilis and Staphylococcus aureus monitored by imaging mass spectrometry

Area of Science:

• Microbiology
• Chemical Ecology
• Analytical Chemistry

Background:

• Microbial competition is prevalent in diverse environments.
• The molecular mechanisms driving microbial competition and niche establishment are not fully understood.
• Understanding these interactions is crucial for fields ranging from ecology to medicine.

Purpose of the Study:

• To investigate the molecular mechanisms of microbial competition between Bacillus subtilis and Staphylococcus aureus.
• To explore the utility of imaging mass spectrometry (IMS) in visualizing metabolic interactions during co-culture.
• To identify novel strategies for antibiotic discovery based on microbial competitive interactions.

Main Methods:

• Co-culturing Bacillus subtilis and Staphylococcus aureus.
• Utilizing imaging mass spectrometry (IMS) to analyze metabolic output and spatial distribution.
• Quantifying changes in Staphylococcus aureus virulence factor production and colonization.

Main Results:

• IMS revealed directional metabolic output from Bacillus subtilis towards Staphylococcus aureus.
• Released antibiotics from B. subtilis significantly altered S. aureus virulence factor production.
• Directional antibiotic release influenced S. aureus colonization patterns.

Conclusions:

• Imaging mass spectrometry (IMS) offers unprecedented insight into the dynamics of microbial competition.
• Bacillus subtilis employs directed antibiotic release as a competitive strategy against Staphylococcus aureus.
• This study provides a new framework for discovering antibiotics by observing microbial interactions.