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Updated: Sep 19, 2025
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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
Published on: October 4, 2019
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Functional Characterization of a Diazo-Forming Enzyme in Meroterpenoid Biosynthesis
Zhao-Xun Liang1, Hartono Candra2, Wan-Qiu Liu1
1School of Biological Sciences, Nanyang Technological University, Singapore, 637551, Singapore.
Chembiochem : a European Journal of Chemical Biology
|June 16, 2025
Summary
This study reveals stFur5 is crucial for furaquinocin M biosynthesis. It catalyzes the diazotization of 8-amino-flaviolin (8-AF) using nitrite, a key step in meroterpenoid natural product formation.
Area of Science:
- Biochemistry
- Natural Product Biosynthesis
- Enzymology
Background:
- Meroterpenoids possess unique structures and hybrid biosynthetic origins.
- Specific genes within meroterpenoid gene clusters have unknown functions.
- Nonmeroterpenoid pathways suggest a role for these genes in nitrite-dependent N-N bond formation.
Purpose of the Study:
- To elucidate the function of elusive genes in meroterpenoid biosynthesis.
- To investigate the role of the stfur5 gene in furaquinocin M production.
- To understand the mechanism of nitrite-dependent reactions in natural product pathways.
Main Methods:
- Utilized a cell-free protein synthesis platform.
- Investigated the function of the stfur5 gene in furaquinocin M biosynthesis.
- Characterized the enzymatic activity of stFur5 and identified its substrate and product.
Main Results:
- The stfur5 gene was confirmed as essential for furaquinocin M biosynthesis.
- stFur5 catalyzes the conversion of 8-amino-flaviolin (8-AF) to diazo-flaviolin.
- Diazo-flaviolin nonenzymatically deaminates to flaviolin, indicating a diazotization pathway.
Conclusions:
- stFur5, along with stFur15 and stFur16, facilitates 8-AF deamination via diazotization in furaquinocin biosynthesis.
- A nitrite-binding pocket in stFur5 was identified, and a catalytic mechanism involving adenylation was proposed.
- The study enhances understanding of diazo-forming enzymes in natural product biosynthesis.
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
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