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Prodigiosin R2, a new prodigiosin from the roseophilin producer Streptomyces griseoviridis 2464-S5.
Journal of Antibiotics 2018 March
Roseophilin (2) is a unique prodigiosin-related compound produced by Streptomyces griseoviridis 2464-S5, and is characterized by a central furan ring and a bicyclic alkyl chain. During a search for biosynthetic intermediates of 2, a new metabolite designated prodigiosin R2 (1) was isolated from the culture of the roseophilin producer. The molecular formula of 1 was established as C27 H35 N3 O by high-resolution FAB-MS. The structure of 1 was determined by NMR spectroscopic analyses as a prodigiosin derivative with the same bicyclic alkyl chain as 2. Prodigiosin R2 (1) showed potent cytotoxicity against HeLa human cervical carcinoma cells and HT1080 human fibrosarcoma cells with IC50 s of 0.41 and 0.82 μM, respectively.
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