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A functional chimeric modular polyketide synthase generated via domain replacement

D Bedford1, J R Jacobsen, G Luo

  • 1Department of Chemical Engineering, Stanford University, Stanford, CA 94305-5025, USA. David_Cane@brown.edu

Chemistry & Biology
|October 1, 1996
PubMed
Summary
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Researchers engineered a chimeric enzyme by swapping a functional ketoreductase (KR) domain in polyketide synthases (PKSs) with a nonfunctional one. This study demonstrates structural flexibility in PKS enzymes, enabling the creation of novel molecular structures.

Area of Science:

  • Biochemistry
  • Enzymology
  • Natural Product Biosynthesis

Background:

  • Modular polyketide synthases (PKSs) are large enzymes crucial for synthesizing complex natural products.
  • Each PKS module contains a reductive segment with domains like ketoreductase (KR), influencing product structure and stereochemistry.
  • Conserved organization of reductive segments suggests potential for engineering novel functions.

Purpose of the Study:

  • To investigate the functional consequences of domain substitution within PKS modules.
  • To explore the potential for altering PKS function by modifying reductive segments.
  • To assess the structural tolerance of PKS enzymes to domain alterations.

Main Methods:

  • Engineered a chimeric enzyme using a bimodular derivative of 6-deoxyerythronolide B synthase (DEBS).

Related Experiment Videos

  • Replaced the functional KR domain in module 2 with a nonfunctional homolog from module 3 of DEBS.
  • Expressed the chimeric gene in a recombinant strain and analyzed the resulting product.

    • Main Results:

    • The chimeric enzyme produced the predicted ketolactone product.
    • The yield of the ketolactone was 35%, comparable to control strains.
    • Demonstrated that a nonfunctional KR domain could be successfully substituted into the PKS module.

    Conclusions:

    • Significant structural tolerance exists within the reductive segment of PKS modules.
    • Defined domain boundaries can be utilized to create loss-of-function and potentially gain-of-function PKS mutants.
    • This work provides a foundation for engineering novel multifunctional enzymes for natural product synthesis.