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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
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Engineering of plant polyketide biosynthesis.

Ikuro Abe1

  • 1School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan. abei@u-shizuoka-ken.ac.jp

Chemical & Pharmaceutical Bulletin
|November 5, 2008
PubMed
Summary

Researchers engineered aloe enzymes, pentaketide chromone synthase (PCS) and octaketide synthase (OKS), to create novel polyketides. Modifying a single active-site residue altered product chain length and specificity, enabling the production of new nonaketide naphthopyrones.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme Engineering

Background:

  • Chalcone synthase (CHS) superfamily type III polyketide synthases (PKSs) are crucial for producing diverse polyketides.
  • Pentaketide chromone synthase (PCS) and octaketide synthase (OKS) from Aloe arborescens represent recently characterized PKS enzymes.

Purpose of the Study:

  • To investigate the role of active-site residues in controlling polyketide chain length and product specificity.
  • To engineer type III PKS enzymes for the production of novel polyketides.

Main Methods:

  • Recombinant expression of PCS and OKS in Escherichia coli.
  • Site-directed mutagenesis and X-ray crystallography.
  • Enzyme activity assays to determine polyketide products.

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Main Results:

  • PCS produces a pentaketide (5,7-dihydroxy-2-methylchromone), while OKS yields aromatic octaketides (SEK4, SEK4b).
  • A single active-site residue substitution (e.g., Met207 in PCS, Gly207 in OKS) dictates polyketide chain length and specificity.
  • Engineered triple mutant PCS (F80A/Y82A/M207G) synthesized a novel nonaketide naphthopyrone.

Conclusions:

  • Structure-based engineering of type III PKS enzymes allows for the creation of novel polyketides with altered chemical structures.
  • This approach holds potential for generating a wider array of unnatural polyketides.