申请人:BASF Plant Science GmbH
公开号:EP2450434A2
公开(公告)日:2012-05-09
The present invention relates to a new process for the production of arachidonic acid and/or eicosapentaenoic acid in plants through the co-expression of a Δ-12-/Δ-15-desaturase, Δ-9-elongase, Δ-8-desaturase and a Δ-5-desaturase and a process for the production of lipids or oils having an increased content of unsaturated fatty acids, in particular ω-3 and w-6 fatty acids having at least two double bonds and a 18 or 20 carbon atom chain length. Preferably the arachidonic acid and eicosapentaenoic acid are produced in at least a 1:2 ratio.
The invention furthermore relates to the production of a transgenic plants, preferably a transgenic crop plant, having an increased content of arachidonic acid and/or eicosapentaenoic acid, oils or lipids containing C18- or C20- fatty acids with a double bond in position Δ□□5. 8, 9, 11, 12, 14, 15 or 17 of the fatty acid produced, respectively due to the expression of the Δ-12-/Δ-15-desaturase, of the Δ-9-elongase, of the Δ-8-desaturase and of the Δ-5-desaturase in the plant. The expression of the inventive Δ-12-/Δ-15-desaturase leads preferably to linoleic acid and linolenic acid as products having a double bond in the position Δ□□ 9, 12 and 15 of the fatty acid.
The invention additionally relates to specific nucleic acid sequences encoding for proteins with Δ-12-/Δ-15-desaturase-, Δ-9-elongase-, A-8-desaturase- or Δ-5-desaturase-activity, nucleic acid constructs, vectors and transgenic plants containing said nucleic acid sequences.
本发明涉及一种通过共同表达Δ-12-/Δ-15-去饱和酶、Δ-9-elongase、Δ-8-去饱和酶和Δ-5-去饱和酶,以及生产不饱和脂肪酸含量增加的脂类或油类的工艺,特别是具有至少两个双键和18或20个碳原子链长的ω-3和w-6脂肪酸。花生四烯酸和二十碳五烯酸的生产比例最好至少为 1:2。
本发明还涉及转基因植物,最好是转基因作物植物的生产,其花生四烯酸和/或二十碳五烯酸、油或脂类的含量增加,这些油或脂类含有在 Δ□□5 位有双键的 C18- 或 C20- 脂肪酸。由于植物中表达了Δ-12-/Δ-15-去饱和酶、Δ-9-延长酶、Δ-8-去饱和酶和Δ-5-去饱和酶,产生的脂肪酸分别为Δ-12-/Δ-15-去饱和脂肪酸的8、9、11、12、14、15或17。本发明的Δ-12-/Δ-15-去饱和酶的表达优选导致亚油酸和亚麻酸作为在脂肪酸的Δ□□9、12 和 15 位上具有双键的产物。
本发明还涉及编码具有Δ-12-/Δ-15-去饱和酶、Δ-9-长效酶、A-8-去饱和酶或Δ-5-去饱和酶活性的蛋白质的特异性核酸序列、核酸构建体、载体和含有所述核酸序列的转基因植物。