Bioactive Secondary Metabolites from an Arctic Marine-Derived Strain, Streptomyces sp. MNP-1, Using the OSMAC...

Area of Science:

• Marine microbiology
• Natural product chemistry
• Drug discovery

Background:

• Arctic marine environments are rich sources of novel microorganisms.
• Streptomyces species are known for producing diverse bioactive secondary metabolites.
• The OSMAC strategy facilitates the discovery of new compounds from microbial isolates.

Purpose of the Study:

• To isolate and characterize bioactive compounds from an Arctic marine-derived Streptomyces strain.
• To evaluate the antimicrobial and cytotoxic activities of the isolated compounds.
• To explore the therapeutic potential of secondary metabolites from Streptomyces sp. MNP-1.

Main Methods:

• Morphological, biochemical, and 16S rRNA sequencing for strain characterization.
• OSMAC strategy for compound isolation.
• Spectroscopic techniques (NMR, ESI-MS) for structure elucidation.
• Bioassays for antimicrobial and cytotoxic activity assessment.

Main Results:

• Twenty known compounds were isolated from Streptomyces sp. MNP-1.
• Compounds 2, 3, 5, 9, 14, 15, and 20 exhibited antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Candida albicans (MIC 4-32 μg/mL).
• Compounds 3 and 14 showed moderate inhibitory activity against A549, MCF-7, and HepG2 tumor cell lines (IC50 19.88-35.82 µM).

Conclusions:

• Streptomyces sp. MNP-1 is a prolific source of bioactive secondary metabolites.
• The isolated compounds possess significant antimicrobial and moderate anticancer properties.
• This study highlights the therapeutic potential of Arctic marine-derived Streptomyces for drug discovery.