PMID: 9422686Jan 31, 1998Paper

Engineering broader specificity into an antibiotic-producing polyketide synthase

Science
A F MarsdenP F Leadlay

Abstract

The wide-specificity loading module for the avermectin-producing polyketide synthase was grafted onto the first multienzyme component (DEBS1) of the erythromycin-producing polyketide synthase in place of the normal loading module. Expression of this hybrid enzyme in the erythromycin producer Saccharopolyspora erythraea produced several novel antibiotic erythromycins derived from endogenous branched-chain acid starter units typical of natural avermectins. Because the avermectin polyketide synthase is known to accept more than 40 alternative carboxylic acids as starter units, this approach opens the way to facile production of novel analogs of antibiotic macrolides.

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