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Decoding and reprogramming complex polyketide assembly lines: prospects for synthetic biology.

Christian Hertweck1

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This review details bacterial modular type I polyketide synthases (PKSs), giant enzymes producing valuable compounds. Advances in understanding PKS mechanisms and engineering tools enable new drug discovery and synthetic biology applications.

Keywords:
antibioticsbiosynthesismacrolidesmodular polyketide synthasethiotemplate

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Area of Science:

  • Biochemistry and Synthetic Biology
  • Enzymology
  • Molecular Biology

Background:

  • Bacterial modular type I polyketide synthases (PKSs) are large enzyme complexes responsible for synthesizing complex polyketide natural products.
  • Many polyketides produced by PKSs possess significant pharmaceutical relevance, driving interest in their study and production.
  • Elucidating the intricate mechanisms of these megasynthases is crucial for harnessing their biosynthetic potential.

Purpose of the Study:

  • To review recent advancements in understanding the mechanisms of bacterial type I PKSs and related enzymes.
  • To explore the implications of this knowledge for synthetic biology, aiming to expand the structural diversity of polyketides.
  • To highlight new bioengineering strategies enabled by insights into biosynthetic codes and thiotemplate systems.

Main Methods:

  • Genome mining to identify novel PKS genes and associated enzymes.
  • DNA recombination technologies for engineering PKS pathways.
  • Biochemical analyses to characterize enzyme function and mechanisms.
  • Exploration of non-canonical polyketide-modifying enzymes.

Main Results:

  • New insights into the biosynthetic codes and structures of thiotemplate systems have been gained.
  • The toolbox of non-canonical polyketide-modifying enzymes has been significantly expanded.
  • A growing set of scaffold-modifying biocatalysts is now available for complex synthetic reactions.

Conclusions:

  • Understanding bacterial type I PKS mechanisms facilitates rational bioengineering for novel compound discovery.
  • Advances in synthetic biology tools and enzyme discovery enable the creation of structurally diverse polyketides.
  • The availability of diverse modifying enzymes opens avenues for synthesizing compounds difficult to achieve through traditional chemical methods.