Didepside Formation by the Nonreducing Polyketide Synthase Preu6 of Preussia isomera Requires Interaction of Starter Acyl Transferase and Thioesterase Domains

Qingpei Liu, Dan Zhang, Shuaibiao Gao, Xianhua Cai, Ming Yao, Yao Xu, Yifu Gong, Ke Zheng, Yigui Mao, Liyan Yang, Dengfeng Yang, István Molnár, Xiaolong Yang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Orsellinic acid (OA) derivatives are produced by filamentous fungi using nonreducing polyketide synthases (nrPKSs). The chain-releasing thioesterase (TE) domains of such nrPKSs were proposed to also catalyze dimerization to yield didepsides, such as lecanoric acid. Here, we use combinatorial domain exchanges, domain dissections and reconstitutions to reveal that the TE domain of the lecanoric acid synthase Preu6 of Preussia isomera must collaborate with the starter acyl transferase (SAT) domain from the same nrPKS. We show that artificial SAT-TE fusion proteins are highly effective catalysts and reprogram the ketide homologation chassis to form didepsides. We also demonstrate that dissected SAT and TE domains of Preu6 physically interact, and SAT and TE domains of OA-synthesizing nrPKSs may co-evolve. Our work highlights an unexpected domain–domain interaction in nrPKSs that must be considered for the combinatorial biosynthesis of unnatural didepsides, depsidones, and diphenyl ethers.

Original languageEnglish (US)
Article numbere202214379
JournalAngewandte Chemie - International Edition
Volume62
Issue number6
DOIs
StatePublished - Feb 1 2023
Externally publishedYes

Keywords

  • Biosynthesis
  • Dimerization
  • Enzyme Catalysis
  • Polyketides
  • Protein-Protein Interactions

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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