Mycosporine-like amino acids and marine toxins--the common and the different.

Marine Drugs
M Klisch, Donat-P Häder

Abstract

Marine microorganisms harbor a multitude of secondary metabolites. Among these are toxins of different chemical classes as well as the UV-protective mycosporine-like amino acids (MAAs). The latter form a group of water-soluble, low molecular-weight (generally < 400) compounds composed of either an aminocyclohexenone or an aminocyclohexenimine ring, carrying amino acid or amino alcohol substituents. So far there has been no report of toxicity in MAAs but nevertheless there are some features they have in common with marine toxins. Among the organisms producing MAAs are cyanobacteria, dinoflagellates and diatoms that also synthesize toxins. As in cyclic peptide toxins found in cyanobacteria, amino acids are the main building blocks of MAAs. Both, MAAs and some marine toxins are transferred to other organisms e.g. via the food chains, and chemical modifications can take place in secondary consumers. In contrast to algal toxins, the physiological role of MAAs is clearly the protection from harmful UV radiation by physical screening. However, other roles, e.g. as osmolytes and antioxidants, are also considered. In this paper the common characteristics of MAAs and marine toxins are discussed as well as the differences.

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Citations

Aug 12, 2010·Saline Systems·Suman MannaMaitree Bhattacharyya
Aug 17, 2011·International Journal of Molecular Sciences·Cynthia Layse F de AlmeidaLeônia M Batista
Apr 17, 2009·Marine Drugs·Alejandro M S Mayer
Jan 1, 2010·Pharmacognosy Research·Saurabh BhatiaS Nanda

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