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Related Experiment Video

Updated: Jun 18, 2026

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
09:08

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Complete reconstitution of a highly reducing iterative polyketide synthase.

Suzanne M Ma1, Jesse W-H Li, Jin W Choi

  • 1Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)
|November 11, 2009
PubMed
Summary

Researchers expressed the lovastatin nonaketide synthase (LovB) in yeast and reconstituted its function. This enzyme makes cholesterol-lowering lovastatin, and its partner enzyme, LovC, acts as a gatekeeper.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Iterative polyketide synthases (PKS) are large enzymes crucial for fungal metabolite production.
  • Lovastatin, a cholesterol-lowering drug, is synthesized by polyketide synthases in Aspergillus terreus.
  • Understanding PKS function is key to developing new pharmaceuticals.

Purpose of the Study:

  • To achieve efficient expression of the lovastatin nonaketide synthase (LovB) in an engineered yeast strain.
  • To reconstitute the catalytic function of LovB in vitro, with and without essential cofactors and its partner enzyme.
  • To investigate the role of the partner enzyme LovC in the PKS pathway.

Main Methods:

  • Engineered Saccharomyces cerevisiae for efficient LovB expression.
  • In vitro reconstitution of LovB activity with cofactors (NADPH, AdoMet) and LovC.
  • Functional analysis of LovB with its native partner LovC and an analogous enzyme (MlcG).

Main Results:

  • Successful expression and functional reconstitution of LovB in yeast.
  • LovB synthesizes dihydromonacolin L but releases incorrectly processed intermediates.
  • LovC demonstrates a gate-keeping function, essential for correct product processing.
  • MlcG, an analogous enzyme, also exhibits gate-keeping properties when interacting with LovB.

Conclusions:

  • LovB can be functionally expressed and reconstituted, providing a system to study PKS mechanisms.
  • The partner enzyme (LovC or MlcG) plays a critical role in ensuring the fidelity of polyketide synthesis.
  • This work advances the understanding of PKS structure-function relationships and their potential in drug discovery.