Casting a net: Fibres produced by Microcystis sp. in field and laboratory populations

Moshe Harel, Gad Weiss, Einat Daniel, Avraham Wilenz, Ora Hadas, Assaf Sukenik, Bojan Sedmak, Elke Dittmann, Sergei Braun, Aaron Kaplan

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The reasons for the apparent dominance of the toxic cyanobacterium Microcystis sp., reflected by its massive blooms in many fresh water bodies, are poorly understood. We show that in addition to a large array of secondary metabolites, some of which are toxic to eukaryotes, Microcystis sp. secretes large amounts of fibrous exopolysaccharides that form extremely long fibres several millimetres in length. This phenomenon was detected in field and laboratory cultures of various Microcystis strains. In addition, we have identified and characterized three of the proteins associated with the fibres and the genes encoding them in Microcystis sp. PCC 7806 but were unable to completely delete them from its genome. Phylogenetic analysis of the most abundant one, designated IPF-469, showed its presence only in cyanobacteria. Its closest relatives were detected in Synechocystis sp. PCC 6803 and in Cyanothece sp. strains; in the latter the genomic organization of the IPF-469 was highly conserved. IPF-469 and the other two proteins identified here, a haloperoxidase and a haemolysin-type calcium-binding protein, may be part of the fibres secretion pathway. The biological role of the fibres in Microcystis sp. is discussed.

Original languageEnglish
Pages (from-to)342-349
Number of pages8
JournalEnvironmental Microbiology Reports
Issue number3
StatePublished - 1 Jun 2012
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)


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