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A Cryptic Palmitoyl Chain Involved in Safracin Biosynthesis Facilitates Post-NRPS Modifications.

This study confirmed the participation of a cryptic palmitoyl fatty acyl chain in the biosynthesis of safracin and unraveled a previously ignored peptidase for the removal of the precursor. Furthermore, the post-assembly line tailoring steps are extensively studied in terms of the methyltransferase SacI-catalyzed N-methylation and the FAD-dependent monooxygenase SacJ-catalyzed A-ring oxidation. The timing of these post-NRPS steps is also addressed in this work.