Abstract
Two new naphthohydroquinone derivatives designated iseoic acids A (1) and B (2) and a new symmetrical glycerol bisester of naphthoquinonepropanoic acid designated bisiseoate (3) were isolated from the culture extract of a marine-derived actinomycete Streptomyces sp. DC4-5. The structures of 1–3 were determined by analyzing one- and two-dimensional NMR data and MS analytical data. The absolute configurations were determined by NOESY analysis and the phenylglycine methyl ester (PGME) method for 1 and by considering the structural similarity and biosynthesis for 2 and 3. Compound 3 exhibited modest cytotoxicity against P388 murine leukemia cells with an IC50 value of 19 μM.
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Acknowledgements
P388 cells were obtained from JCRB Cell Bank under an accession code JCRB0017 (Lot. 06252002). We also thank Drs. Md. Rokon Ul Karim and Tao Zhou at Toyama Prefectural University for cytotoxicity assay and structure analysis.
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Supplementary Information for Iseoic acids and bisiseoate: three new naphthalene/naphthoquinone-class metabolites from a coral-derived actinomycete of the genus <i>Streptomyces</i>
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Zhang, Z., Harunari, E. & Igarashi, Y. Iseoic acids and bisiseoate: three new naphthohydroquinone/naphthoquinone-class metabolites from a coral-derived Streptomyces. J Antibiot 76, 618–622 (2023). https://doi.org/10.1038/s41429-023-00644-9
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DOI: https://doi.org/10.1038/s41429-023-00644-9