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Related Concept Videos

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Riboswitches

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Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
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Related Experiment Video

Updated: Jun 24, 2026

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes T&#252;6028
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Fungal type I polyketide synthases.

Russell J Cox1, Thomas J Simpson

  • 1School of Chemistry, University of Bristol, Bristol, United Kingdom.

Methods in Enzymology
|April 14, 2009
PubMed
Summary

Fungal polyketide synthases (PKSs) are complex enzymes producing diverse bioactive compounds. New genetic and biochemical methods offer improved understanding of these crucial fungal metabolic pathways.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Mycology

Background:

  • Fungi synthesize numerous biologically active compounds via the polyketide pathway.
  • Fungal polyketides, including lovastatin and aflatoxins, are structurally diverse and biologically significant.
  • Iterative type I polyketide synthases (PKSs) are large, multifunctional enzymes responsible for fungal polyketide production.

Purpose of the Study:

  • To provide an overview of methodologies for studying fungal polyketide synthases (PKSs).
  • To enhance understanding of the function of PKSs involved in producing aromatic and highly reduced polyketides.
  • To bridge the knowledge gap regarding the enzyme-level mechanisms of fungal polyketide biosynthesis.

Main Methods:

  • Overview of in vivo genetic studies on PKSs.

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  • Summary of in vitro biochemical analyses of PKSs.
  • Discussion of methodologies applied to both aromatic and reduced polyketide PKSs.

    • Main Results:

    • Established methodologies facilitate genetic and biochemical investigation of fungal PKSs.
    • Studies are yielding improved insights into the complex functioning of these enzymes.
    • A foundation for further research into fungal secondary metabolite production is presented.

    Conclusions:

    • Despite extensive study, fungal PKSs remain incompletely understood at the enzyme level.
    • Current methodologies are advancing our comprehension of PKS function and polyketide biosynthesis.
    • Further application of these techniques will illuminate the intricate mechanisms of fungal secondary metabolism.