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Peptide diversity in strains of the cyanobacterium Microcystis aeruginosa isolated from Portuguese water supplies

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Strains of the cyanobacterium Microcystis aeruginosa were isolated into pure culture from a variety of lakes, rivers, and reservoirs in Portugal. Samples were tested with matrix-assisted laser desorption/ionization–time-of-flight mass spectrometry (MALDI-TOF MS) to investigate the presence of various peptide groups including aeruginosins, microginins, anabaenopeptins, cyanopeptilins, microcystins, and microviridins and other peptide-like compounds. Binary data, based on the presence and absence of different peptide groups, were analyzed by phylogenetic inference. DNA was also extracted from the samples and tested using a range of primers. Those strains that gave positive results for a Microcystis-specific primer pair were further analyzed for the presence of genes linked to the biosynthesis of microginin and microcystin. The results showed that a wide range of microcystin forms were produced by the strains among which MC-LR, -FR, -RR, -WR, and -YR were the most common. The peptide profiles obtained from the MALDI analysis were assessed using cluster analysis which resulted in the formation of distinct groups or chemotypes.

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Correspondence to Vitor M. Vasconcelos.

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Martins, J., Saker, M.L., Moreira, C. et al. Peptide diversity in strains of the cyanobacterium Microcystis aeruginosa isolated from Portuguese water supplies. Appl Microbiol Biotechnol 82, 951–961 (2009).

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  • Microcystis
  • Peptides