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A Ferric-Superoxide Intermediate Initiates P450-Catalyzed Cyclic Dipeptide Dimerization.

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Cytochrome P450 AspB initiates diketopiperazine assembly using a ferric-superoxide oxidant, not a ferryl-intermediate. This study reveals a novel heme enzyme reaction pathway for natural product biosynthesis.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Natural Product Biosynthesis

Background:

  • Diketopiperazines (DKPs) are a large family of bioactive natural products.
  • Cytochrome P450s (CYPs) are enzymes with diverse catalytic functions.
  • AspB is a CYP enzyme implicated in aspergilazine A biosynthesis.

Purpose of the Study:

  • To elucidate the mechanism of DKP assembly by the CYP AspB.
  • To investigate the role of oxidant species in AspB-catalyzed reactions.
  • To explore novel reaction pathways in heme enzymes.

Main Methods:

  • Steady-state and transient kinetic analyses.
  • Kinetic isotope effect studies.
  • Substrate analog experiments.

Main Results:

  • The mechanism involves a ferric-superoxide species as the primary oxidant.
  • This differs from the previously proposed ferryl-intermediate mechanism.
  • Evidence suggests a specific site of substrate abstraction.

Conclusions:

  • CYP AspB utilizes a ferric-superoxide species for DKP biosynthesis.
  • This finding reveals a new reaction manifold for heme enzymes.
  • The study challenges existing models for CYP-mediated C-N bond formation.