Spatiochemically Profiling Microbial Interactions with Membrane Scaffolded Desorption Electrospray Ionization-Ion...

Area of Science:

• Microbial Ecology
• Chemical Biology
• Analytical Chemistry

Background:

• Understanding microbial small molecule interactions is crucial for microbial chemical ecology and human medicine.
• Current methods for analyzing microbial metabolites in situ have limitations in sensitivity and spatial resolution.

Purpose of the Study:

• To develop and validate a novel method for enhanced detection and spatial analysis of metabolites in interspecies microbial interactions on surfaces.
• To utilize desorption electrospray ionization-imaging mass spectrometry (DESI-IMS) with microporous membrane scaffolds (MMS) for improved spatiochemical analysis.

Main Methods:

• Desorption electrospray ionization-imaging mass spectrometry (DESI-IMS) combined with microporous membrane scaffolds (MMS) for direct, in situ analysis of microbial communities.
• Comparison of MMS-DESI-IMS with other imaging mass spectrometry (IMS) techniques like MALDI and liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS).
• Application of unsupervised segmentation imaging analysis to DESI-IMS data for identifying distinct chemical regions and microbial phenomena.

Main Results:

• MMS-DESI-IMS demonstrated superior sensitivity and unique mass-to-charge (m/z) measurements compared to LC-ESI-MS.
• Unsupervised segmentation successfully identified chemical regions associated with microbial predation and communication.
• The method validated known roles of Myxovirescin A (predation) and DKxanthene-560 (phase variation) and identified 54 unknown small molecules in predation regions.

Conclusions:

• MMS-DESI-IMS provides a rapid, sensitive, and spatially resolved method for analyzing microbial small molecule interactions.
• This technique enables the annotation of known microbial biology and facilitates the functional exploration of novel small molecules.
• The findings offer significant advancements for microbial chemical ecology and the discovery of new natural products for medicine.