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Updated: May 9, 2026

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
Published on: January 13, 2017
A two-step sulfation in antibiotic biosynthesis requires a type III polyketide synthase
Xiaoyu Tang1, Kornelia Eitel, Leonard Kaysser
1Pharmaceutical Institute, University of Tübingen, Tübingen, Germany.
Researchers discovered a novel two-step sulfation pathway in caprazamycin (CPZ) antibiotic biosynthesis. This process utilizes a unique type III polyketide synthase and two sulfotransferases to create essential sulfate donors for bacterial sulfate metabolism.
Area of Science:
- Microbiology
- Biochemistry
- Synthetic Biology
Background:
- Caprazamycins (CPZs) are liponucleoside antibiotics targeting bacterial MraY translocase, crucial for peptidoglycan synthesis.
- Recent identification of sulfated CPZ analogs revealed a potential novel biosynthetic pathway.
Purpose of the Study:
- To elucidate the unprecedented two-step sulfation mechanism in caprazamycin biosynthesis.
- To identify the enzymes and intermediates involved in generating sulfated caprazamycins.
Main Methods:
- Investigated the role of type III polyketide synthase (Cpz6) in producing triketide pyrones.
- Characterized the activity of PAPS-dependent (Cpz8) and PAPS-independent (Cpz4) sulfotransferases.
- Determined the function of phenolic sulfate esters as sulfate donors.
Main Results:
- Cpz6 biosynthesizes triketide pyrones that act as precursors.
- Cpz8 generates phenolic sulfate esters from these pyrones using 3'-phosphoadenosine-5'-phosphosulfate (PAPS).
- Cpz4 utilizes these esters to sulfated caprazamycins in a PAPS-independent manner.
Conclusions:
- This study reveals the first known genuine sulfate donors for arylsulfate sulfotransferases.
- It is the first report of a type III PKS generating a reagent for bacterial sulfate metabolism.
- The findings provide new insights into antibiotic biosynthesis and bacterial sulfate metabolism.
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