Enhancing the Modularity of the Modular Polyketide Synthases: Transacylation in Modular Polyketide Synthases Catalyzed by Malonyl-CoA:ACP Transacylase

Pawan Kumar, Andrew T Koppisch, David E. Cane, Chaitan Khosla

Research output: Contribution to journalArticle

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Abstract

Selective incorporation of extender units in modular polyketide synthases is primarily controlled by acyl transferase (AT) domains. The AT domains catalyze transacylation of the extender unit from acyl-CoA to the phosphopantetheine arm of an acyl carrier protein (ACP) domain in the same module. New methods that can modulate the extender unit specificity of individual modules with minimal structural or kinetic perturbations in the engineered module are desirable for the efficient biosynthesis of novel natural product analogues. We have demonstrated that transacylation of malonyl groups onto an AT-null form of a mutant modular polyketide synthase by malonyl-CoA:ACP transacylase is an effective strategy for the engineered biosynthesis of site specifically modified polyketides. Using this strategy, 6-deoxyerythronolide B synthase was engineered to exclusively produce 2-desmethyl-6-deoxyerythronolide B. The productivity of the modified system was comparable to that of the wild-type synthase in vitro and in vivo.

Original languageEnglish (US)
Pages (from-to)14307-14312
Number of pages6
JournalJournal of the American Chemical Society
Volume125
Issue number47
DOIs
StatePublished - Nov 26 2003
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)

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