Abstract
Cyanobacteria have recently been rediscovered as proficient producers of bioactive secondary metabolites, in special, polyketides, alkaloids and peptides. Noteworthy are the peptides produced by megasyntethases (microcystins, nodularin, aeruginosina) or ribosomally (microviridins, cyanobactins, lantipeptides). Microviridins belong to a new class of depsipeptides horbouring a unique cage-l…