Abstract
Genome mining and gene deletion experiments in Penicillium crustosum proved the involvement of the PKS-NRPS PemA and the trans-enoyl reductase PemB in the formation of three enantiomeric clavatol-containing tetramate pairs. Overexpression of a transcription factor significantly improved the product yields. Feeding experiments provided evidence for their formation via 1,4-Michael addition of hydroxyclavatol to two tetramates from the Pem pathway. This study provides another example of the involvement of reactive intermediates in multiple biosynthetic pathways.
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