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Mass Spectrometry: Isotope Effect

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...

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Characterization of Variation in Natural Product Production Under Chemical Elicitation Using Parallel Stable Isotope

Liana Zaroubi¹, Bruno S Paulo^2,3, Ethan Fung¹

¹Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.

ACS Chemical Biology

|September 17, 2025

Summary

This summary is machine-generated.

Researchers used chemical elicitors to stimulate dormant microbial genes, discovering new compounds like putrescinamides A and B. This method, employing stable isotope labeling, reveals how different conditions impact natural product biosynthesis.

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Area of Science:

Microbiology
Natural Product Chemistry
Metabolomics

Background:

Microorganisms possess numerous biosynthetic gene clusters (BGCs) but produce limited secondary metabolites in lab cultures.
Chemical elicitors can induce secondary metabolite production via the one-strain-many-compounds (OSMAC) strategy.
Characterizing metabolomic variations under elicitation requires advanced analytical tools beyond traditional methods.

Purpose of the Study:

To investigate secondary metabolite production in *Paraburkholderia* strains under various OSMAC conditions.
To assess the impact of chemical elicitors on the microbial metabolome and identify novel compounds.
To evaluate the utility of IsoAnalyst for characterizing secondary metabolism variations.

Main Methods:

Application of the one-strain-many-compounds (OSMAC) strategy with chemical elicitors.
Utilizing IsoAnalyst, a stable isotope labeling technique, to track metabolite biosynthesis.
Employing multidimensional NMR and total synthesis for structure elucidation and absolute configuration determination.

Main Results:

Profiling of three *Paraburkholderia* strains under diverse OSMAC conditions revealed significant changes in secondary metabolism.
IsoAnalyst successfully differentiated metabolites and linked them to BGCs under elicitation.
The antibiotic rifaximin strongly induced a specific compound class, leading to the discovery of putrescinamides A and B.

Conclusions:

Stable isotope labeling experiments offer insights into system-wide secondary metabolite biosynthesis under elicitor conditions.
Elicitor selection significantly impacts metabolite induction in *Burkholderiales* strains.
The study highlights the potential of OSMAC and IsoAnalyst for discovering novel natural products.