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Pyrrolizidine alkaloids (PAs) are a group of natural products with important biological activities. The discovery and characterization of the multifunctional FAD-dependent enzyme LgnC is now described. The enzyme is shown to convert indolizidine intermediates into pyrrolizidines through an unusual ring expansion/contraction mechanism, and catalyze the biosynthesis of new bacterial PAs, the so-called legonmycins. By genome-driven analysis, heterologous expression, and gene inactivation, the legonmycins were also shown to originate from non-ribosomal peptide synthetases (NRPSs). The biosynthetic origin of bacterial PAs has thus been disclosed for the first time. [ABSTRACT FROM AUTHOR]

Das multifunktionelle Baeyer ‐ Villiger ‐ Enzym …︁…︁ LgnC katalysiert die Umsetzung von Indolizidinen zu Pyrrolizidinen durch Carbamat ‐ Bildung, Hydrolyse, decarboxylierende Ringkontraktion und Hydroxylierung. In ihrer Zuschrift auf S. 12888 ff. zeigen H. Deng, Y. Yu et al., dass dies die entscheidenden Schritte bei der Biosynthese der Legonmycine sind – neuartige bakterielle Pyrrolizidin ‐ Alkaloide, benannt nach der ghanaischen Stadt Legon. [ABSTRACT FROM AUTHOR]