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Photopiperazines A-D, photosensitive interconverting diketopiperazines with significant and selective activity against U87 glioblastoma cells, from a rare, marine-derived actinomycete of the family Streptomycetaceae

TitlePhotopiperazines A-D, photosensitive interconverting diketopiperazines with significant and selective activity against U87 glioblastoma cells, from a rare, marine-derived actinomycete of the family Streptomycetaceae
Publication TypeJournal Article
Year of Publication2019
AuthorsKim M.C, Cullum R., Machado H., Smith A.J, Yang I., Rodvold J.J, Fenical W
Volume82
Pagination2262-2267
Date Published2019/08
Type of ArticleArticle
ISBN Number0163-3864
Accession NumberWOS:000483435000024
Keywords2,5-diketopiperazines; agent; antimicrotubule; enzymatic-synthesis; medicinal chemistry; Pharmacology & Pharmacy; Plant Sciences
Abstract

Photopiperazines A-D (1-4), unsaturated diketopiperazine derivatives, were isolated from the culture broth of a rare, marine-derived actinomycete bacterium, strain AJS-327. This strain shows very poor 16S rRNA sequence similarity to other members of the actinomycete family Streptomycetaceae, indicating it is likely a new lineage within this group. The structures of the photopiperazines were defined by analysis of HR-ESI-TOF-MS spectra in conjunction with the interpretation of 1D and 2D NMR data. The photopiperazines are sensitive to light, causing interconversion among the four olefin geometrical isomers, which made purification of each isomer challenging. The photopiperazines are highly cytotoxic metabolites that show selective toxicity toward U87 glioblastoma and SKOV3 ovarian cancer cell lines.

DOI10.1021/acs.jnatprod.9b00429
Student Publication: 
No
Research Topics: 
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