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J Nat Prod. 2007 Jan;70(1):95-9.

Pyrroloacridine alkaloids from Plakortis quasiamphiaster: structures and bioactivity.

Author information

1
Department of Chemistry and Biochemistry, Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA.

Abstract

A re-collection of Plakortis quasiamphiaster from Vanuatu in 2003 resulted in the isolation of three known compounds, plakinidine A (1) and amphiasterins B1 (6) and B2 (7). Also isolated was a new bis-oxygenated pyrroloacridine alkaloid, plakinidine E (8), with a unique O-substitution versus N-substitution at position C-12 in 1. The biological evaluation of the active compounds in two assays provided complementary data. Plakinidine A (1) exhibited cytotoxicity against human colon H-116 cells with an IC50 of 0.23 microg/mL, but there were no effects against the yeast Saccharomyces cerevisiae diploid homozygous deletion strain of topoisomerase I (top1Delta). By contrast, 8 was inactive against H-116 cells but was potent in the yeast halo screen.

PMID:
17253856
PMCID:
PMC1839848
DOI:
10.1021/np060585w
[Indexed for MEDLINE]
Free PMC Article

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