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Related Experiment Videos

Dissecting and exploiting intermodular communication in polyketide synthases.

R S Gokhale1, S Y Tsuji, D E Cane

  • 1Department of Chemical Engineering, Stanford University, Stanford CA 94305-5025, USA.

Science (New York, N.Y.)
|April 16, 1999
PubMed
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Modular polyketide synthases show surprising tolerance for different acyl chains. Protein engineering of these enzymes allows for the transfer of intermediates between modules, offering insights into their evolution.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Natural Product Biosynthesis

Background:

  • Modular polyketide synthases (PKS) are large enzymes that synthesize complex natural products.
  • These enzymes function via an assembly-line mechanism with high specificity.
  • Understanding PKS module tolerance is key to unlocking novel compound synthesis.

Purpose of the Study:

  • To investigate the substrate tolerance of individual modules within modular polyketide synthases.
  • To explore the potential of protein engineering to manipulate acyl chain transfer between PKS modules.
  • To gain insights into the evolutionary pathways of modular PKS.

Main Methods:

  • Site-directed mutagenesis to engineer linker regions within and between PKS modules.
  • In vitro assays to assess the transfer of diverse acyl chains between engineered modules.

Related Experiment Videos

  • Bioinformatic analysis to compare engineered PKS with naturally occurring variants.

    • Main Results:

    • Individual PKS modules exhibit significant tolerance to a wide range of incoming acyl chains.
    • Engineering of linker regions successfully facilitated the transfer of biosynthetic intermediates between non-native module combinations.
    • Demonstrated the feasibility of using protein engineering to redirect PKS assembly lines.

    Conclusions:

    • Modular PKS exhibit inherent flexibility in substrate acceptance, challenging previous assumptions of strict module-specific processing.
    • Protein engineering of PKS linkers is a viable strategy to create novel polyketide structures.
    • This work provides a foundation for synthetic biology approaches to natural product drug discovery and understanding PKS evolution.