Abstract
Recombinant ketoreductase (KR) domains derived from antibiotic-producing modular polyketide synthases (PKSs) have been examined as potential catalysts for the enantioselective reduction of non-polyketide substrates. KR domains from two modular PKSs show significant activity toward alternative substrates, particularly those that incorporate cyclohexyl moieties. Through site-directed mutagenesis of the amino acid motifs previously implicated in stereocontrol by KRs, we have identified mutants with improved activity toward such compounds. These results suggest that PKS KRs could potentially be used as biotransformation catalysts for the production of chiral alcohols.
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