Planta Med 2009; 75 - SL10
DOI: 10.1055/s-0029-1234265

New antiplasmodial natural products from cyanobacteria: linking their ecological role to their therapeutic potential

C Portmann 1, JF Blom 2, M Kaiser 3, R Brun 3, F Jüttner 2, K Gademann 1
  • 1Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
  • 2Limnological Station, University of Zürich, 8802 Kilchberg, Switzerland
  • 3Parasite Chemotherapy, Swiss Tropical Institute, 4002 Basel, Switzerland

Cyanobacteria (blue-green algae) produce many metabolites that are directed towards competing photoautotrophs. Such algicidal compounds might offer new approaches for the selective inhibition of the malaria parasite, Plasmodium falciparum, as this organism contains an organelle (apicoplast) of algal origin [1]. In this communication, we report the identification of two classes of cyanobacterial secondary metabolites with antiplasmodial activity.

Aerucyclamides A-D [2] are heterocyclic peptides that are ribosomally produced [3] by Microcystis aeruginosa PCC7806. Nostocarboline is a chlorinated N-methylated carbolinium alkaloid from Nostoc 78–12A [4]. Both compounds display submicromolar IC50 values against Plasmodium falciparum, with a pronounced selectivity towards rat myoblasts. Their respective potential ecological roles and therapeutic potentials will be discussed.

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[2] a) Portmann, C. et al. (2008)J. Nat. Prod. 71:1193–1196. Portmann, C. et al. (2008)J. Nat. Prod. 71:1891–1896.

[3] Ziemert, N. et al. (2008) Appl. Environ. Microbiol. 74:1791–1797.

[4] a) Becher, P.G. et al. (2005)J. Nat. Prod. 68:1793–1795. b) Barbaras, D. et al. (2008) Biorg. Med. Chem. Lett. 18:4413–4415. c) Portmann, C. et al. (2009) ChemBioChem 10:889–895.