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Molecular Basis for the Final Oxidative Rearrangement Steps in Chartreusin Biosynthesis.

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Researchers discovered a novel enzyme, ChaP, crucial for forming the complex structure of the antitumor compound chartreusin. This dioxygenase utilizes flavin-activated oxygen, revealing new insights into oxidative rearrangements in natural product biosynthesis.

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Area of Science:

  • Biochemistry and Natural Product Biosynthesis
  • Enzymology and Protein Structure
  • Chemical Biology

Background:

  • Oxidative rearrangements are vital for generating structural diversity and bioactivity in natural products synthesized by type II polyketide synthases (PKSs).
  • Chartreusin (1), a potent antitumor agent, features a unique pentacyclic aromatic bilactone aglycone originating from a type II PKS pathway.

Purpose of the Study:

  • To identify and characterize the enzyme responsible for the final α-pyrone ring formation in chartreusin biosynthesis.
  • To elucidate the molecular mechanism of the oxidative rearrangement catalyzed by this novel enzyme.

Main Methods:

  • Biochemical characterization of the dioxygenase ChaP and its homologues.
  • X-ray crystallography to determine the three-dimensional structures of ChaP and related enzymes.
  • Computational docking studies and site-directed mutagenesis to probe enzyme-substrate interactions and catalytic mechanisms.

Main Results:

  • An unprecedented dioxygenase, ChaP, was identified as the catalyst for the terminal α-pyrone ring formation in chartreusin biosynthesis, using flavin-activated oxygen.
  • Structural and mechanistic studies revealed a novel oxidative rearrangement involving two sequential C-C bond cleavages followed by lactonization.
  • ChaP represents a new class within the vicinal oxygen chelate (VOC) enzyme superfamily, uniquely utilizing flavin-activated oxygen without intrinsic flavin-binding sites.

Conclusions:

  • ChaP catalyzes a unique oxidative rearrangement essential for chartreusin's complex structure and likely its biological activity.
  • The discovery of ChaP expands the known repertoire of dioxygenases and highlights novel mechanisms in flavin-dependent oxygen activation.
  • This work provides a molecular foundation for understanding complex natural product biosynthesis and opens avenues for enzyme engineering.