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Pass-back chain extension expands multimodular assembly line biosynthesis.

Jia Jia Zhang1, Xiaoyu Tang1, Tao Huan2

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|October 23, 2019
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Summary

This study reveals novel biosynthetic pathways for thalassospiramides, cyclic lipodepsipeptide protease inhibitors. These complex enzyme assembly lines exhibit flexible substrate-driven interactions, expanding chemical diversity.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Modular nonribosomal peptide synthetase (NRPS) and polyketide synthase (PKS) systems are large enzyme complexes.
  • These systems typically follow linear biosynthetic pathways to produce complex molecules.

Purpose of the Study:

  • To characterize hybrid NRPS-PKS assembly lines for thalassospiramide biosynthesis.
  • To investigate the mechanisms generating chemical diversity in these systems.

Main Methods:

  • Heterologous reconstitution of NRPS-PKS assembly lines.
  • Comprehensive characterization of enzyme function.
  • Site-directed mutagenesis to inactivate specific enzyme domains.

Main Results:

  • Demonstrated unprecedented biosynthetic models for thalassospiramides.
  • Identified intermodule substrate activation, tailoring, module skipping, and pass-back chain extension.
  • Showcased flexible, substrate-driven chain extension mechanisms.

Conclusions:

  • The findings challenge conventional understanding of multimodular enzyme elasticity.
  • Bidirectional intermodule domain interactions offer a strategy for generating chemical diversity.
  • This work expands the known biosynthetic potential of NRPS-PKS megaenzymes.