The synchronous TAG production with the growth by the expression of chloroplast transit peptide-fused ScPDAT in Chlamydomonas reinhardtii.

The synchronous TAG production with the growth by the expression of chloroplast transit peptide-fused ScPDAT in Chlamydomonas reinhardtii.
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莱茵衣藻中叶绿体转运肽融合ScPDAT表达与生长同步产生TAG

DOI:
10.1186/s13068-018-1160-6
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发表时间:
2018
影响因子:
6.3
通讯作者:
Xue S
Xue S
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhu Z;Yuan G;Fan X;Fan Y;Yang M;Yin Y;Liu J;Liu Y;Cao X;Tian J;Xue S

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研究背景三酰甘油(TAG)的同步生产是降低微藻生物燃料生产成本的关键环节。磷脂:二酰基甘油酰基转移酶(diacylglycerol acyltransferase,PDAT)是新近发现的一种催化磷脂酰基合成TAG的酶,被认为是莱茵衣藻TAG的重要来源。莱茵衣藻CC-137 western blot结果表明,ScPDAT的表达与对数生长期细胞的生长呈同步趋势。与野生型相比,Scpdat菌株的总脂肪酸含量增加了22%,TAG含量增加了32%。此外,单半乳糖基二酰甘油、二酰甘油基三甲基高丝氨酸和TAG中C16系列脂肪酸的波动表明TAG积累途径的增强。
BackgroundThe synchronous triacylglycerol (TAG) production with the growth is a key step to lower the cost of the microalgae-based biofuel production. Phospholipid: diacylglycerol acyltransferase (PDAT) has been identified recently and catalyzes the phospholipid contributing acyl group to diacylglycerol to synthesize TAG, and is considered as the important source of TAG in Chlamydomonas reinhardtii.ResultsUsing a chimeric Hsp70A–RbcS2 promoter, exogenous PDAT form Saccharomyces cerevisiae fused with a chloroplast transit peptide was expressed in C. reinhardtii CC-137. Proved by western blot, the expression of ScPDAT showed a synchronous trend to the growth in the exponential phase. Compared to the wild type, the strain of Scpdat achieved 22% increase in the content of total fatty acids and 32% increase in TAG content. In addition, the fluctuation of C16 series fatty acid in monogalactosyldiacylglycerol, diacylglyceryltrimethylhomoserine and TAG indicated an enhancement in the TAG accumulation pathway.Conclusion
DOI: 10.3389/fpls.2016.00958
发表时间: 2016
影响因子: 5.6
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