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Area of Science:

  • Biochemistry and enzymology
  • Structural biology
  • Metabolic pathways

Background:

  • Enzyme-catalyzed oxidations are fundamental to metabolism.
  • Cofactor-independent oxygenases, like DpgC in vancomycin biosynthesis, lack accessory cofactors or metal ions.
  • The reaction mechanisms of these enzymes remain largely uncharacterized.

Purpose of the Study:

  • To determine the structure of a cofactor-independent oxygenase (DpgC) with a bound substrate mimic.
  • To elucidate the mechanism of oxygen activation in this enzyme class.
  • To understand the role of DpgC in vancomycin biosynthesis.

Main Methods:

  • X-ray crystallography of DpgC in complex with a synthetic substrate analogue.
  • Analysis of electron density to identify bound molecular oxygen.
  • Biochemical assays to probe enzyme activity and mechanism.

Main Results:

  • The first structure of a cofactor-independent oxygenase with a bound substrate mimic was determined.
  • The structure confirmed the absence of cofactors and revealed molecular oxygen bound near the substrate's oxidation site.
  • The substrate itself provides the reducing power for oxygen activation, occurring within a hydrophobic pocket.

Conclusions:

  • The study resolves the unique oxygen activation chemistry of DpgC, a key enzyme in vancomycin antibiotic synthesis.
  • Mechanistic insights into cofactor-independent oxygen activation were gained.
  • Parallels were drawn between DpgC and cofactor-dependent flavoenzymes, offering broader implications for enzymatic oxygen activation mechanisms.