Journal
CHEMBIOCHEM
Volume 17, Issue 22, Pages 2143-2148Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.201600348
Keywords
antibiotics; aristeromycin; biosynthesis; five-membered cyclitol; myo-inositol phosphate synthase
Funding
- JSPS KAKENHI [16H06451]
- Grants-in-Aid for Scientific Research [16H06451] Funding Source: KAKEN
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Aristeromycin is a unique carbocyclic nucleoside antibiotic produced by Streptomyces citricolor. In order to elucidate its intriguing carbocyclic formation, we used a genome-mining approach to identify the responsible enzyme. In silico screening with known cyclitol synthases involved in primary metabolism, such as myo-inositol-1-phosphate synthase (MIPS) and dehydroqunate synthase (DHQS), identified a unique MIPS orthologue (Ari2) encoded in the genome of S. citricolor. Heterologous expression of the gene cluster containing ari2 with a cosmid vector in Streptomyces albus resulted in the production of aristeromycin, thus indicating that the cloned DNA region (37.5 kb) with 33 open reading frames contains its biosynthetic gene cluster. We verified that Ari2 catalyzes the formation of a novel five-membered cyclitol phosphate from D-fructose 6-phosphate (F6P) with NAD(+) as a cofactor. This provides insight into cyclitol phosphate synthase as a member of the MIPS family of enzymes. A biosynthetic pathway to aristeromycin is proposed based on bioinformatics analysis of the gene cluster.
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