Abstract
Recombinant microbial whole-cell biocatalysis is a valuable approach for producing enantiomerically pure intermediates for the synthesis of complex molecules. Here, we describe a method to produce polyketide intermediates possessing multiple stereogenic centers by combining chemobiosynthesis and engineered mini-polyketide synthases (PKSs). Chemobiosynthesis allows the introduction of unnatural moieties, while a library of synthetic bimodular PKSs expressed from codon-optimized genes permits the introduction of a variety of ketide units. To validate the approach, intermediates for the synthesis of trans-9,10-dehydroepothilone D were generated. The designer molecules obtained have the potential to greatly reduce the manufacturing cost of epothilone analogues, thus facilitating their commercial development as therapeutic agents.
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