Biosynthetic gene cluster of cetoniacytone A, an unusual aminocyclitol from the endosymbiotic Bacterium Actinomyces sp. Lu 9419.
Biosynthetic gene cluster of cetoniacytone A, an unusual aminocyclitol from the endosymbiotic Bacterium Actinomyces sp. Lu 9419.
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DOI:
10.1002/cbic.200800527
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发表时间:
2009-01-26
期刊:
影响因子:
3.2
通讯作者:
Mahmud, Taifo
中科院分区:
文献类型:
--
作者:
Wu, Xiumei;Flatt, Patricia M.;Xu, Hui;Mahmud, Taifo
A gene cluster responsible for the biosynthesis of the antitumor agent cetoniacytone A was identified in Actinomyces sp. strain Lu 9419, an endosymbiotic bacteria isolated from the intestines of the rose chafer beetle (Cetonia aurata). The nucleotide sequence analysis of the 46 kb DNA region revealed the presence of 31 complete ORFs, including genes predicted to encode a 2-epi-5-epi-valiolone synthase (CetA), a glyoxalase/bleomycin resistance protein (CetB), an acyltransferase (CetD), an FAD-dependent dehydrogenase (CetF2), two oxidoreductases (CetF1 and CetG), two aminotransferases (CetH and CetM), and a pyranose oxidase (CetL). CetA has previously been demonstrated to catalyze the cyclization of sedoheptulose 7-phosphate to the cyclic intermediate, 2-epi-5-epi-valiolone. In this report, the glyoxalase/bleomycin resistance protein homolog CetB was identified as a 2-epi-5-epi-valiolone epimerase (EVE), a new member of the Vicinal Oxygen Chelate (VOC) superfamily. The 24 kDa recombinant histidine-tagged CetB was found to form a homodimer; each monomer contains two βαβββ scaffolds that form a metal binding site with two histidine and two glutamic acid residues. BLAST search using the newly isolated cet biosynthetic genes revealed an analogous suite of genes in the genome of Frankia alni ACN14a, suggesting that this plant symbiotic nitrogen-fixing bacterium is capable of producing a secondary metabolite related to the cetoniacytones.
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影响因子:
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作者:
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通讯作者:
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DOI:
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