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N-Acetyl-Cysteinylated Streptophenazines from Streptomyces
Kristiina Vind1,2, Sonia Maffioli1, Blanca Fernandez Ciruelos2
1NAICONS Srl, 20139 Milan, Italy.
Researchers discovered novel N-acetyl-cysteinylated streptophenazines from soil bacteria. These compounds show broad-spectrum antibacterial activity with low cytotoxicity, highlighting metabolomics for natural product discovery.
Area of Science:
- Natural Product Discovery
- Microbiology
- Metabolomics
Background:
- Streptophenazines are natural products with potential bioactivity.
- Identifying novel variants requires advanced screening methods.
- Soil-derived microorganisms are a rich source of diverse metabolites.
Purpose of the Study:
- To discover and characterize new N-acetyl-cysteinylated streptophenazines.
- To evaluate the antibacterial activity and cytotoxicity of the novel compounds.
- To investigate the biosynthetic pathway and origin of the N-acetyl-cysteine moiety.
Main Methods:
- Metabolomic analysis of Streptomyces sp. ID63040 fermentation broths.
- Structure elucidation of isolated compounds (1 and 2).
- Bioactivity screening for antibacterial effects and cytotoxicity assessment.
- Bioinformatic analysis of the biosynthetic gene cluster.
Main Results:
- Two N-acetyl-cysteinylated streptophenazines (1 and 2) were identified.
- Compounds 1 and 2 exhibited broad-spectrum antibacterial activity.
- The novel compounds demonstrated low cytotoxicity.
- The N-acetyl-cysteine moiety likely originates from cellular functions, possibly mycothiol.
Conclusions:
- Metabolomics is effective for discovering novel natural products.
- Streptomyces sp. ID63040 produces unique streptophenazine variants.
- House-keeping cellular functions can contribute to natural product diversification.
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