"Non-toxic" cyclic peptides induce lysis of cyanobacteria - An effective cell population density control mechanism in cyanobacterial blooms

B. Sedmak, S. Carmeli, Tina Eleršek

Research output: Contribution to journalArticlepeer-review

Abstract

The presence of planktopeptin BL1125, anabaenopeptin B and anabaenopeptin F, two types of "non-toxic" cyclic peptide produced in bloom forming cyanobacteria, can provoke lysis of different non-axenic Microcystis aeruginosa cell lines via the induction of virus-like particles. The resulting particles are also able to infect the axenic M. aeruginosa cell line without lytic effects. Nevertheless, the presence of "non-toxic" cyclic peptides of cyanobacterial origin can induce lysis of these previously infected cells. This effect implies that a possible role of these peptides in the natural environment is the control of cyanobacterial population density. Lysogenic cyanobacteria can consequently act as hot-spots that, in the presence of cyanobacterial cyclic peptides, release numerous infectious particles. The process can be self-augmented with the simultaneous release of additional cyclic peptides from the producing lysogens, starting a forest fire effect that ends in collapse of cyanobacterial blooms.

Original languageEnglish
Pages (from-to)201-209
Number of pages9
JournalMicrobial Ecology
Volume56
Issue number2
DOIs
StatePublished - Aug 2008

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