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J Nat Prod. 1996 Mar;59(3):219-23.

Plakortides, novel cyclic peroxides from the sponge Plakortis halichondrioides: activators of cardiac SR-CA(2+)-pumping ATPase.

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Department of Biomolecular Discovery, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406-0939, USA. Inet:


As part of a search for novel activators of Ca2+ pumping activity of cardiac SR- (sarcoplasmic reticulum), the EtOAc extract of the Jamaican sponge Plakortis halichondrioides was shown to be active. Bioassay-guided fractionation of the extract followed by preparative TLC and HPLC yielded several known and novel compounds. Three of the novel cyclic peroxides, plakortides F, G, and H (3, 4, and 5) are the subject of this report. Their structures including relative stereochemistry were established by interpretation of spectral data. Micromolar concentrations of plakortides F-H (3-5) were found to significantly enhance Ca2+ uptake by SR.

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