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Antifouling activity of brominated cyclopeptides from the marine sponge Geodia barretti
Södertörn University, School of Chemistry, Biology, Geography and Environmental Science. Karolinska Institute.
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2004 (English)In: Journal of natural products (Print), ISSN 0163-3864, E-ISSN 1520-6025, Vol. 67, no 3, 368-372 p.Article in journal (Refereed) Published
Abstract [en]

In this work, we show the potent antifouling effects of two compounds, barettin (cyclo[(6-bromo-8-entryptophan)arginine]) (1), isolated as a Z/E mixture (87/13), and 8,9-dihydrobarettin (cyclo[(6-bromotryptophan)arginine]) (2), isolated from the marine sponge Geodia barretti. The compounds were isolated guided by their ability to inhibit the settlement of cyprid larvae of the barnacle Balanus improvisus, and their structures were determined by means of mass spectrometry, NMR, and quantitative amino acid analysis. The activities of these brominated diketopiperazine-like cyclic dipeptides are in the range of antifouling agents in use today, as shown by their EC50 values of 0.9 and 7.9 muM, respectively. However, contrary to today's antifouling agents, the effects of barettin and 8,9-dihydrobarettin are nontoxic and reversible. A small set of synthetic analogues, including L-arginine, L-tryptophan, 5-bromo-D,L-tryptophan, 6-bromo-D,L-tryptophan, and 6-fluoro-D,L-tryptophan, were tested for possible structure-activity relationships. None of these compounds showed any effect at a concentration of 10 muM. We hypothesize that the isolated compounds are part of the sponge's chemical defense to deter fouling organisms. This theory is supported by the fact that barettin is found in water exposed to living specimens of G. barretti in concentrations that completely inhibit barnacles from settling.

Place, publisher, year, edition, pages
2004. Vol. 67, no 3, 368-372 p.
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Natural Sciences
URN: urn:nbn:se:sh:diva-15484DOI: 10.1021/np0302403ISI: 000220523500012PubMedID: 15043412ScopusID: 2-s2.0-12144286116OAI: diva2:504626
Available from: 2012-02-21 Created: 2012-02-20 Last updated: 2014-04-23Bibliographically approved

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Bergman, Jan
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