Improvement of FK506 Production in Streptomyces tsukubaensis by Genetic Enhancement of the Supply of Unusual Polyketide Extender Units via Utilization of Two Distinct Site-Specific Recombination Systems

Abstract excerpt

FK506 is a potent immunosuppressant that has a wide range of clinical applications. Its 23-member macrocyclic scaffold, mainly with a polyketide origin, features two methoxy groups at C-13 and C-15 and one allyl side chain at C-21, due to the region-specific incorporation of two unusual extender units derived from methoxymalonyl-acyl carrier protein (ACP) and allylmalonyl-coenzyme A (CoA), respectively. Whether...

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