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Polyketide chain length control by chain length factor.

Yi Tang1, Shiou-Chuan Tsai, Chaitan Khosla

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

Journal of the American Chemical Society
|October 16, 2003
PubMed
Summary
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The chain length factor subunit of bacterial ketosynthases controls polyketide backbone length. Researchers identified key residues to engineer chain length, enabling novel polyketide scaffold biosynthesis.

Area of Science:

  • Biochemistry
  • Natural Product Biosynthesis
  • Molecular Biology

Background:

  • Bacterial aromatic polyketides are crucial pharmacologically active natural products.
  • Polyketide backbone chain length is a critical determinant of their structure.
  • Controlling polyketide chain length during biosynthesis is a significant challenge.

Purpose of the Study:

  • To elucidate the role of the catalytically silent subunit in heterodimeric ketosynthases.
  • To identify the molecular determinants of polyketide chain length control.
  • To enable the engineered biosynthesis of novel polyketide structures.

Main Methods:

  • Structure-based mutagenesis of ketosynthase subunits.
  • Biochemical characterization of engineered enzymes.

Related Experiment Videos

  • Analysis of polyketide product structures.

    • Main Results:

    • The catalytically silent subunit, termed chain length factor, is the primary determinant of polyketide chain length.
    • Specific residues within the chain length factor were identified as key modulators of chain length.
    • Mutagenesis successfully converted an octaketide synthase into a decaketide synthase and vice versa.

    Conclusions:

    • The chain length factor subunit plays a critical role in dictating polyketide backbone length.
    • Targeted manipulation of chain length factor residues allows for precise control over polyketide biosynthesis.
    • These findings open new avenues for the discovery and engineering of novel polyketide scaffolds.