Aryl-aldehyde Formation in Fungal Polyketides: Discovery and Characterization of a Distinct Biosynthetic Mechanism

• We identify a distinct mechanism for aryl-aldehyde generation in polyketides
• An NRPS-like protein can activate and reduce an aryl-acid to an aryl-aldehyde
• Such a distinct mechanism may be widely used throughout the fungi kingdom

SummaryAryl-aldehydes are a common feature in fungal polyketides, which are considered to be exclusively generated by the R domain of nonreducing polyketide synthases (NR-PKSs). However, by cloning and heterologous expression of both cryptic NR-PKS and nonribosomal peptide synthase (NRPS)-like genes from Aspergillus terreus in Saccharomyces cerevisiae, we identified a distinct mechanism for aryl-aldehyde formation in which a NRPS-like protein activates and reduces an aryl-acid produced by the accompanying NR-PKS to an aryl-aldehyde. Bioinformatics study indicates that such a mechanism may be widely used throughout the fungi kingdom.

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