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Overexpression of diacylglycerol acetyltransferase from Euonymus europaeus in Yarrowia lipolytica leads to the production of single-cell oil enriched with 3-acetyl-1,2-diacylglycerols.
Yeast ( IF 2.6 ) Pub Date : 2019-11-13 , DOI: 10.1002/yea.3442
Peter Gajdoš 1 , Jaroslav Hambalko 1 , Jean-Marc Nicaud 2 , Milan Čertík 1
Affiliation  

The 3-acetyl-1,2-diacylglycerols (acTAGs) are the molecules that are structurally similar to triacylglycerols (TAGs). They are naturally produced by plants of the family Celastraceae and animals such as Cervus nippon and Eurosta solidaginis. The presence of acetate in the sn-3 position of the glycerol backbone confers advantages to these compounds, for example, lower viscosity and calorific value compared to classical TAGs. In this work, the gene EeDAcT, which encodes diacylglycerol acetyltransferase in a species of bush (Euonymus europaeus), was overexpressed in strains Po1d (capable of accumulating storage lipids) and JMY1877 (incapable of accumulating storage lipids) of Yarrowia lipolytica, to test the activity of the gene EeDAcT and the production of acTAGs in oleaginous and nonoleaginous genetic backgrounds. It was observed that both the strains containing the gene EeDAcT (YL33 and YL35 for Po1d and JMY1877 strains, respectively) produced acTAGs. The strain YL33 accumulated up to 20% intracellular lipids, 20% of which was acTAGs, and 40% was TAGs. On the other hand, the strain YL35, which showed interrupted TAGs accumulation, produced up to 10% acTAGs as the only storage lipid. Unfortunately, the quantity of acTAGs produced in YL35 was insignificant, as the overall lipid accumulated in the strain was not more than 4% of the biomass. The fatty acid profile of acTAGs produced by the YL33 strain was remarkably similar to TAGs, and both of these structures were rich in oleic (45%) and palmitic (25%) acids.

中文翻译:

在解脂耶氏酵母中从欧洲卫矛(Euonymus europaeus)过表达二酰基甘油乙酰基转移酶会导致产生富含3-乙酰基1,2-二酰基甘油的单细胞油。

3-乙酰基1,2-二酰基甘油(acTAG)是在结构上类似于三酰基甘油(TAGs)的分子。它们是由Celastraceae家族的植物和诸如Cervus nippon和Eurosta solidaginis之类的动物自然产生的。甘油骨架的sn-3位置存在乙酸盐为这些化合物提供了优势,例如,与传统TAG相比,粘度和热值更低。在这项工作中,在灌木(Euonymus europaeus)的一个物种中编码二酰基甘油乙酰基转移酶的基因EeDAcT在解脂耶氏酵母的Po1d(能够积聚贮藏脂质)和JMY1877(无法积聚贮藏脂质)菌株中过表达。油性和非油性遗传背景中EeDAcT基因的活性和acTAG的产生。观察到两种包含基因EeDAcT的菌株(Po1d和JMY1877菌株分别为YL33和YL35)均产生acTAG。YL33菌株积累了高达20%的细胞内脂质,其中20%是acTAG,而40%是TAG。另一方面,显示中断的TAG积累的菌株YL35,最多可产生10%的acTAG作为唯一的脂质。不幸的是,由于菌株中积累的总脂质不超过生物质的4%,因此YL35中产生的acTAGs数量微不足道。由YL33菌株产生的acTAGs的脂肪酸谱与TAGs非常相似,并且这两个结构均富含油酸(45%)和棕榈酸(25%)。YL33菌株积累了高达20%的细胞内脂质,其中20%是acTAG,而40%是TAG。另一方面,显示中断的TAG积累的菌株YL35,最多可产生10%的acTAG作为唯一的脂质。不幸的是,由于菌株中积累的总脂质不超过生物质的4%,因此YL35中产生的acTAGs数量微不足道。由YL33菌株产生的acTAGs的脂肪酸谱与TAGs非常相似,并且这两个结构均富含油酸(45%)和棕榈酸(25%)。YL33菌株积累了高达20%的细胞内脂质,其中20%是acTAG,而40%是TAG。另一方面,显示中断的TAG积累的菌株YL35,最多可产生10%的acTAG作为唯一的脂质。不幸的是,由于菌株中积累的总脂质不超过生物质的4%,因此YL35中产生的acTAGs数量微不足道。由YL33菌株产生的acTAGs的脂肪酸谱与TAGs非常相似,并且这两个结构均富含油酸(45%)和棕榈酸(25%)。因为菌株中积累的总脂质不超过生物质的4%。由YL33菌株产生的acTAGs的脂肪酸谱与TAGs非常相似,并且这两个结构均富含油酸(45%)和棕榈酸(25%)。因为菌株中积累的总脂质不超过生物质的4%。由YL33菌株产生的acTAGs的脂肪酸谱与TAGs非常相似,并且这两个结构均富含油酸(45%)和棕榈酸(25%)。
更新日期:2019-11-01
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