NDLI: Molecular analysis of ∆6 desaturase and ∆6 elongase from Conidiobolus obscurus in the biosynthesis of eicosatetraenoic acid, a ω3 fatty acid with nutraceutical potentials

Content Provider	Springer Nature Link
Author	Tan, Li Meesapyodsuk, Dauenpen Qiu, Xiao
Copyright Year	2011
Abstract	Conidiobolus obscurus, an entomopathogenic fungus able to infect aphids, was previously reported to produce substantial amounts of very long chain polyunsaturated fatty acids (VLCPUFAs) that may mediate the insect infection. However, the genes involved in the biosynthesis of these VLCPUFAs from the order Entomophthorales have yet to be identified. Using degenerate reverse transcriptase-polymerase chain reaction and rapid amplification of the cDNA end methods, we cloned a ∆6 desaturase cDNA (CoD6) and a ∆6 elongase cDNA (CoE6) from C. obscurus. Expression of CoD6 and CoE6 in Saccharomyces cerevisiae revealed CoD6 could introduce a Δ6 double bond into α-linolenic acid (18:3n-3), and CoE6 preferentially elongated 18-carbon Δ6 desaturated fatty acid stearidonic acid (18:4n-3). When the fungus was grown under a temperature shift from 20°C to 10°C, the transcript level of CoD6 and CoE6 increased, whereas when the fungal culture was shifted from 20°C to 30°C, the transcript level of both genes decreased. The entire eicosatetraenoic acid biosynthetic pathway was reconstituted in yeast using four genes, CoD6 and CoE6 from C. obscurus, CpDes12 (a Δ12 desaturase) and CpDesX (a ω3 desaturase) from Claviceps purpurea. Yeast transformants expressing the four genes produced ten new fatty acids including the final product eicosatetraenoic acid (ETA). This represents the reconstitution of the entire ETA pathway in yeast without supplementation of any exogenous fatty acids.
Starting Page	591
Ending Page	601
Page Count	11
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	90
Issue Number	2
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-01-06
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	VLCPUFAs Eicosatetraenoic acid Δ6 desaturase Δ6 elongase Conidiobolus obscurus Biotechnology Microbiology Microbial Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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