Abstract:
:Dietary omega-3 long-chain polyunsaturated fatty acids (LC-PUFAs), docosahexaenoic acid (DHA, C22:6) and eicosapentaenoic acid (EPA, C20:5) are usually derived from marine fish. Although production of both EPA and DHA has been engineered into land plants, including Arabidopsis, Camelina sativa and Brassica juncea, neither has been produced in commercially relevant amounts in a widely grown crop. We report expression of a microalgal polyketide synthase-like PUFA synthase system, comprising three multidomain polypeptides and an accessory enzyme, in canola (Brassica napus) seeds. This transgenic enzyme system is expressed in the cytoplasm, and synthesizes DHA and EPA de novo from malonyl-CoA without substantially altering plastidial fatty acid production. Furthermore, there is no significant impact of DHA and EPA production on seed yield in either the greenhouse or the field. Canola oil processed from field-grown grain contains 3.7% DHA and 0.7% EPA, and can provide more than 600 mg of omega-3 LC-PUFAs in a 14 g serving.
journal_name
Nat Biotechnoljournal_title
Nature biotechnologyauthors
Walsh TA,Bevan SA,Gachotte DJ,Larsen CM,Moskal WA,Merlo PA,Sidorenko LV,Hampton RE,Stoltz V,Pareddy D,Anthony GI,Bhaskar PB,Marri PR,Clark LM,Chen W,Adu-Peasah PS,Wensing ST,Zirkle R,Metz JGdoi
10.1038/nbt.3585subject
Has Abstractpub_date
2016-08-01 00:00:00pages
881-7issue
8eissn
1087-0156issn
1546-1696pii
nbt.3585journal_volume
34pub_type
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