cytoskyrins and cytosporones produced by cytospora sp. cr200 taxonomy, fermentation and biological activitiescytoskyrins cytosporones由cytospora sp。cr200分类,发酵和生物活动.pdf
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Mar. Drugs 2007, 5, 71-84
Marine Drugs
ISSN 1660-3397
© 2007 by MDPI
/marinedrugs
Full Original Paper
Cytoskyrins and Cytosporones Produced by Cytospora sp.
CR200: Taxonomy, Fermentation and Biological Activities
Maya P. Singh 1,*, Jeffrey E. Janso 1 and Sean F. Brady 2,†
1 Natural Products Research, Chemical and Screening Sciences, Wyeth Research, Pearl River, NY
10965, USA; E-mail: jansoj@
2 Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School,
Boston, MA 02115, USA
† Current address: Laboratory of Genetically Encoded Small Molecules, The Rockefeller University,
New York, NY 10021; E-mail: sbrady@
* Author to whom correspondence should be addressed; E-mail: singhm@
Received: 22 June 2007 / Accepted: 8 July 2007 / Published: 19 July 2007
Abstract: In screening endophytic fungi from Costa Rica for bioactivity, fungal culture CR200,
isolated from a buttonwood tree, was found to contain compounds that initiate DNA damage in a
test strain of E. coli (Biochemical Induction Assay, BIA) and inhibit growth of Gram-positive
bacteria, including antibiotic-resistant strains. Two new bisanthraquinones (cytoskyrins A and B)
and five new related octaketides (cytosporones A-E) were isolated from fermentation broths of
this fungus. Cytoskyrin A exhibited potent in-vitro antibacterial (MICs against Gram-positive
bacteria, 0.03 - 0.25 μg/mL) and DNA-damaging activities (10 ng/spot), whereas cytoskyrin B
was inactive in these assays. Among the cytosporones, only D and E exhibited Gra
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