Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 22, Issue 13, Pages 4338-4340Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2012.05.005
Keywords
Biosynthesis; Polyketide; Polyketide synthase; Azaanthraquinone; Bostrycoidin
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- CREST program from Japan Science and Technology Agency, Japan
- Grants-in-Aid for Scientific Research [23241068] Funding Source: KAKEN
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Bostrycoidin and fusarubin are biologically active fungal polyketides produced by Nectria haematococca. This azaanthraquinone and naphthoquinone are thought to be biosynthesized via formation of a C-14 heptaketide aldehyde as a common key intermediate. A BLAST search against the genome of N. haematococca revealed one candidate gene (NECHADRAFT_101778, NhPKS1), which encodes a multi-domain polyketide synthase (PKS) with a thiol reductase (TR) domain that would facilitate the reductive release of the intermediate to produce a free aldehyde. To investigate the possible involvement of NhPKS1 in the biosynthesis of bostrycoidin and fusarubin, NhPKS1 was heterologously expressed in Aspergillus oryzae, and shown to produce a heptaketide 3-acetonyl-1,6,8-trihydroxy-2-naphthaldehyde as a single product. Thus, NhPKS1 catalyzes a C-2/C-11 and C-4/C-9 aldol-type cyclization of a linear intermediate followed by a subsequent reductive product release to yield the naphthaldehyde. The results indicate NhPKS1 is the enzyme involved in the biosynthesis of bostrycoidin and fusarubin. (C) 2012 Elsevier Ltd. All rights reserved.
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