Conserved Enzymatic Cascade for Bacterial Azoxy Biosynthesis.

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.