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Related Experiment Video

Updated: Dec 22, 2025

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
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Probing Selectivity and Creating Structural Diversity Through Hybrid Polyketide Synthases.

Aaron A Koch1, Jennifer J Schmidt1, Andrew N Lowell1,2

  • 1Life Sciences Institute, The University of Michigan (USA), 210 Washtenaw Avenue, Ann Arbor, MI, 48109-2216, USA.

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|May 2, 2020
PubMed
Summary

Engineering polyketide synthases (PKS) requires understanding bottlenecks. The thioesterase (TE) domain is key, as swapping it with compatible versions improves production of new polyketide analogs.

Keywords:
PKS engineeringbiocatalysisbiosynthesisnatural productspolyketides

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Metabolic Engineering

Background:

  • Polyketide synthases (PKS) are crucial for producing diverse natural products.
  • Engineering PKS for novel metabolite production faces challenges in substrate processing.
  • The thioesterase (TE) domain is identified as a major bottleneck in engineered PKS.

Purpose of the Study:

  • To investigate the role of the thioesterase (TE) domain in PKS substrate processing.
  • To evaluate the impact of exchanging TE domains on PKS catalytic efficiency.
  • To identify strategies for improving analog production in engineered PKS pathways.

Main Methods:

  • Construction of hybrid PKS modules with heterologous TE domains.
  • Testing hybrid PKS modules with both native and non-native polyketide substrates.
  • Analysis of product formation and conversion rates.

Main Results:

  • Wildtype PKS modules showed poor conversion with non-native substrates.
  • Hybrid PKS modules with non-cognate TE domains exhibited reduced product formation.
  • Hybrid modules with substrate-compatible TE domains successfully converted non-native substrates.

Conclusions:

  • The TE domain acts as a critical gatekeeper in PKS substrate processing.
  • TE domain compatibility is essential for efficient polyketide analog production.
  • Targeting the TE domain offers a promising strategy for protein engineering in PKS systems.