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Marine Biology

, Volume 151, Issue 4, pp 1365–1373 | Cite as

Cellular localisation of secondary metabolites isolated from the Caribbean sponge Plakortis simplex

  • Marc Laroche
  • Concetta Imperatore
  • Lubomir Grozdanov
  • Valeria Costantino
  • Alfonso Mangoni
  • Ute Hentschel
  • Ernesto Fattorusso
Research Article

Abstract

The Caribbean sponge, Plakortis simplex, is known to contain a large array of secondary metabolites, including the antimalarial polyketide plakortin, several unusual glycolipids, and some hopanoids, which closely resemble typical bacterial metabolites. The hypothesis that they could be products of bacterial metabolism was tested by localizing specific metabolites in cells using physical separation of sponge cells, bacterial symbionts and supernatant by differential centrifugation. The obtained fractions were analysed separately for the typical P. simplex metabolites by NMR and mass spectrometry, and most of them were shown to be present in the bacterial cells but not in the sponge cells. In addition, PCR screening showed that the biosynthetic pathway for glycosphingolipids was present in the bacterial cells. Isolation of a Sphingomonas strain PS193 from P. simplex and subsequent glycosphingolipid analysis resulted in the detection of a known glycosphingolipid, GSL-1, that did, however, not match the glycosphingolipid profile of P. simplex. Therefore, it is unlikely that Sphingomonas strain PS193 is an abundant member of the microbial community associated with P. simplex. Other glycosphingolipid producing bacteria in P. simplex remain to be identified. In conclusion, this study provides experimental evidence that the glycolipids and hopanoids and possibly also the polyketide plakortin are produced by microbial symbionts rather than the sponge from which the metabolites were originally isolated.

Keywords

Sponge Polyketide Cell Separation Sphingomonas Marine Sponge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors are very grateful to Prof. J. R. Pawlik, UNCW for inviting them to participate to the third Pawlik expedition during which the material was collected, and to Prof. M. Pansini, University of Genova for the sponge taxonomy determination. Mass and NMR spectra were recorded at the “Centro di Servizi Interdipartimentale di Analisi Strumentale”, Università di Napoli “Federico II”. The assistance of the staff is gratefully acknowledged. This research project is funded by the Italian Government, MIUR PRIN (Italy) and by the CEE “Marie Curie Host Fellowship Contract no. HPMD-CT-2001-101. This study was also supported by grants of the DFG (SFB630 TP A5) and the bmb+f (BiotecMarin: 03F0414E) to U. Hentschel.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Marc Laroche
    • 1
  • Concetta Imperatore
    • 1
  • Lubomir Grozdanov
    • 2
  • Valeria Costantino
    • 1
  • Alfonso Mangoni
    • 1
  • Ute Hentschel
    • 2
  • Ernesto Fattorusso
    • 1
  1. 1.Dipartimento di Chimica delle Sostanze NaturaliUniversità di Napoli Federico IINapoliItaly
  2. 2.Research Center for Infectious DiseasesUniversity of WürzburgWürzburgGermany

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