Complexity generation during natural product biosynthesis using redox enzymes

Redox enzymes such as FAD-dependent and cytochrome P450 oxygenases play indispensible roles in generating structural complexity during natural product biosynthesis. In the pre-assembly steps, redox enzymes can convert garden variety primary metabolites into unique starter and extender building blocks. In the post-assembly tailoring steps, redox cascades can transform nascent scaffolds into structurally complex final products. In this review, we will discuss several recently characterized redox enzymes in the biosynthesis of polyketides and nonribosomal peptides.

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► Redox enzymes play important roles in pre-assembly and post-assembly modifications.
► Both PKS and NRPS pathways use redox enzymes to introduce structural complexity.
► Recent discoveries of novel redox enzymes are discussed.