New structural variants of aeruginosin produced by the toxic bloom forming cyanobacterium Nodularia spumigena.

Nodularia spumigena is a filamentous diazotrophic cyanobacterium that forms blooms in brackish water bodies. This cyanobacterium produces linear and cyclic peptide protease inhibitors which are thought to be part of a chemical defense against grazers. Here we show that N.