AI Insight
Researchers developed a new method that combines MALDI tandem mass spectrometry with the IDBac platform to rapidly screen microbial colonies for novel natural products directly from single colonies, without requiring time-consuming cultivation and extraction steps. The approach successfully identified known bioactive compounds including napyradiomycins and lavanducyanin from marine bacteria, and led to the discovery of napyradiomycin B8 from a marine Streptomyces species. When applied to 25 marine vertebrate-associated bacteria, the method detected several known bioactive molecules and enabled isolation of harmane derivatives.
Why it matters
This workflow significantly accelerates the discovery of new antibiotics and other therapeutically valuable compounds from microbes by enabling researchers to prioritize promising strains early in the screening process, reducing wasted effort on rediscovering known molecules and eliminating the need for extensive cultivation before metabolite analysis.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Microbial libraries remain an important resource for natural product discovery; however, constructing taxonomically and chemically diverse collections remains a challenge. Advances in dereplication strategies, including molecular networking, have reduced the rediscovery of known bioactive molecules and facilitated the identification of novel chemical scaffolds, but these approaches are typically applied after library construction or to existing repositories. Furthermore, many dereplication workflows require scaled fermentation and extraction, increasing the time needed to assess a microbe’s metabolite profile. Here, we integrate matrix-assisted laser desorption/ionization tandem mass spectrometry (MALDI-MS/MS) into the bioinformatics platform IDBac, enabling streamlined characterization of microbial taxonomic identity, metabolite production potential, and preliminary metabolite annotation through GNPS2 molecular networking. This miniaturized high-content workflow facilitates strain prioritization by providing metabolite annotations directly from single microbial colonies prior to scale-up and extraction. Application of this approach to marine actinomycetes enabled the annotation of lavanducyanin and multiple napyradiomycin analogs. Subsequent investigation led to the discovery of napyradiomycin B8 from marine Streptomyces sp. CNZ-289, which was confirmed by 1D and 2D NMR spectroscopy and MALDI-MS/MS. Expanding this workflow to an untargeted analysis of 25 commensal marine vertebrate-derived bacterial isolates resulted in the annotation of several known bioactive natural products, including surugamides, antimycins, desferrioxamine siderophores, and the isolation and elucidation of harmane derivatives using NMR.
Source: MALDI Tandem Mass Spectrometry for Colony-Based Dereplication of Natural Products