Involvement of phosphatidate phosphatase in the biosynthesis of triacylglycerols in Chlamydomonas reinhardtii

文献类型： 外文期刊

第一作者： Deng, Xiao-dong

作者： Deng, Xiao-dong;Cai, Jia-jia;Fei, Xiao-wen

作者机构：

关键词： Phosphatidate phosphohydrolase 2;Triacylglycerol biosynthesis;RNAi;Chlamydomonas reinhardtii;Nitrogen deprivation;Over-expression

期刊名称：JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE B （ 影响因子：3.066； 五年影响因子：3.057 ）

ISSN： 1673-1581

年卷期： 2013 年 14 卷 12 期

页码：

收录情况： SCI

摘要： Lipid biosynthesis is essential for eukaryotic cells, but the mechanisms of the process in microalgae remain poorly understood. Phosphatidic acid phosphohydrolase or 3-sn-phosphatidate phosphohydrolase (PAP) catalyzes the dephosphorylation of phosphatidic acid to form diacylglycerols and inorganic orthophosphates. This reaction is integral in the synthesis of triacylglycerols. In this study, the mRNA level of the PAP isoform CrPAP2 in a species of Chlamydomonas was found to increase in nitrogen-free conditions. Silencing of the CrPAP2 gene using RNA interference resulted in the decline of lipid content by 2.4%-17.4%. By contrast, over-expression of the CrPAP2 gene resulted in an increase in lipid content by 7.5%-21.8%. These observations indicate that regulation of the CrPAP2 gene can control the lipid content of the algal cells. In vitro CrPAP2 enzyme activity assay indicated that the cloned CrPAP2 gene exhibited biological activities.

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