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Conserved Enzymatic Cascade for Bacterial Azoxy Biosynthesis.

Jingkun Shi1, Xin Zang2, Zhijie Zhao1

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Researchers uncovered the enzyme cascade responsible for forming the azoxy bond in valanimycin biosynthesis. This discovery reveals a conserved bacterial strategy for creating bioactive azoxy compounds.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Microbial Metabolism

Background:

  • Azoxy compounds possess diverse biological activities and unique chemical structures.
  • The enzymatic mechanisms underlying azoxy bond formation in metabolite biosynthesis remain largely uncharacterized.

Purpose of the Study:

  • To elucidate the enzyme cascade responsible for azoxy bond formation during valanimycin biosynthesis.
  • To investigate the potential conservation of this enzymatic strategy in other bacterial azoxy metabolite pathways.

Main Methods:

  • Characterization of a two-metalloenzyme system involved in valanimycin biosynthesis.
  • Analysis of homologous enzyme pairs from other bacterial azoxy metabolite pathways.

Main Results:

  • Identified a membrane-bound hydrazine synthase and a nonheme diiron azoxy synthase that collaborate to form the azoxy bond.
  • Demonstrated a hydrazine-azo-azoxy pathway for the conversion of an intermediate to the azoxy product.
  • Proposed that this two-enzyme cascade is a conserved mechanism for azoxy bond formation in bacteria.

Conclusions:

  • Provided significant mechanistic insights into biological N-N bond formation.
  • The findings facilitate the targeted isolation of bioactive azoxy compounds via genome mining.