Nectrisine Biosynthesis Genes in Thelonectria discophora SANK 18292: Identification and Functional Analysis.

Autor:	Miyauchi R; Modality Research Laboratories, R&D Division, Daiichi Sankyo Co., Ltd., Tokyo, Japan miyauchi.ryuki.d4@daiichisankyo.co.jp., Ono C; Onahama Plant, Daiichi Sankyo Chemical Pharma Co., Ltd., Iwaki, Fukushima, Japan., Ohnuki T; Research Management Department, Daiichi Sankyo RD Novare Co., Ltd., Tokyo, Japan., Shiba Y; CMC Planning Department, Pharmaceutical Technology Division, Daiichi Sankyo Co., Ltd., Hiratsuka, Kanagawa, Japan.
Jazyk:	angličtina
Zdroj:	Applied and environmental microbiology [Appl Environ Microbiol] 2016 Oct 14; Vol. 82 (21), pp. 6414-6422. Date of Electronic Publication: 2016 Oct 14 (Print Publication: 2016).
DOI:	10.1128/AEM.01709-16
Abstrakt:	The fungus Thelonectria discophora SANK 18292 produces the iminosugar nectrisine, which has a nitrogen-containing heterocyclic 5-membered ring and acts as a glycosidase inhibitor. In our previous study, an oxidase (designated NecC) that converts 4-amino-4-deoxyarabinitol to nectrisine was purified from T. discophora cultures. However, the genes required for nectrisine biosynthesis remained unclear. In this study, the nectrisine biosynthetic gene cluster in T. discophora was identified from the contiguous genome sequence around the necC gene. Gene disruption and complementation studies and heterologous expression of the gene showed that necA, necB, and necC could be involved in nectrisine biosynthesis, during which amination, dephosphorylation, and oxidation occur. It was also demonstrated that nectrisine could be produced by recombinant Escherichia coli coexpressing the necA, necB, and necC genes. These findings provide the foundation to develop a bacterial production system for nectrisine or its intermediates through genetic engineering. Importance: Iminosugars might have great therapeutic potential for treatment of many diseases. However, information on the genes for their biosynthesis is limited. In this study, we report the identification of genes required for biosynthesis of the iminosugar nectrisine in Thelonectria discophora SANK 18292, which was verified by disruption, complementation, and heterologous expression of the genes involved. We also demonstrate heterologous production of nectrisine by recombinant E. coli, toward developing an efficient production system for nectrisine or its intermediates through genetic engineering. (Copyright © 2016, American Society for Microbiology. All Rights Reserved.)
Databáze:	MEDLINE
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