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Updated: May 22, 2026

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
Published on: January 13, 2017
A heptaketide naphthaldehyde produced by a polyketide synthase from Nectria haematococca
Takayoshi Awakawa1, Takuya Kaji, Toshiyuki Wakimoto
1Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Researchers identified the NhPKS1 gene in Nectria haematococca, responsible for producing fungal polyketides like bostrycoidin and fusarubin. This gene encodes a key enzyme that creates a crucial intermediate for their biosynthesis.
Area of Science:
- Biochemistry
- Mycology
- Molecular Biology
Background:
- Bostrycoidin and fusarubin are biologically active fungal polyketides from Nectria haematococca.
- Their biosynthesis is believed to involve a C(14) heptaketide aldehyde intermediate.
Purpose of the Study:
- To identify and characterize the enzyme responsible for the biosynthesis of bostrycoidin and fusarubin.
- To investigate the role of the candidate gene NhPKS1 in producing the heptaketide aldehyde intermediate.
Main Methods:
- Bioinformatic analysis (BLAST search) to identify candidate genes in N. haematococca.
- Heterologous expression of the NhPKS1 gene in Aspergillus oryzae.
- Analysis of the expressed product to determine its structure and function.
Main Results:
- A single candidate gene, NhPKS1, encoding a polyketide synthase (PKS) with a thiol reductase (TR) domain, was identified.
- Heterologous expression of NhPKS1 yielded a specific heptaketide product: 3-acetonyl-1,6,8-trihydroxy-2-naphthaldehyde.
- NhPKS1 was shown to catalyze cyclization and reductive release of the heptaketide aldehyde intermediate.
Conclusions:
- NhPKS1 is the enzyme responsible for catalyzing the formation of the key heptaketide aldehyde intermediate.
- This finding elucidates a crucial step in the biosynthesis of fungal polyketides bostrycoidin and fusarubin.
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